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39 * \brief Implements the MD runner routine calling all integrators.
41 * \author David van der Spoel <david.vanderspoel@icm.uu.se>
42 * \ingroup module_mdrun
59 #include "gromacs/commandline/filenm.h"
60 #include "gromacs/domdec/domdec.h"
61 #include "gromacs/domdec/domdec_struct.h"
62 #include "gromacs/domdec/localatomsetmanager.h"
63 #include "gromacs/domdec/partition.h"
64 #include "gromacs/ewald/ewald_utils.h"
65 #include "gromacs/ewald/pme.h"
66 #include "gromacs/ewald/pme_gpu_program.h"
67 #include "gromacs/fileio/checkpoint.h"
68 #include "gromacs/fileio/gmxfio.h"
69 #include "gromacs/fileio/oenv.h"
70 #include "gromacs/fileio/tpxio.h"
71 #include "gromacs/gmxlib/network.h"
72 #include "gromacs/gmxlib/nrnb.h"
73 #include "gromacs/gpu_utils/clfftinitializer.h"
74 #include "gromacs/gpu_utils/gpu_utils.h"
75 #include "gromacs/hardware/cpuinfo.h"
76 #include "gromacs/hardware/detecthardware.h"
77 #include "gromacs/hardware/printhardware.h"
78 #include "gromacs/imd/imd.h"
79 #include "gromacs/listed_forces/disre.h"
80 #include "gromacs/listed_forces/gpubonded.h"
81 #include "gromacs/listed_forces/orires.h"
82 #include "gromacs/math/functions.h"
83 #include "gromacs/math/utilities.h"
84 #include "gromacs/math/vec.h"
85 #include "gromacs/mdlib/boxdeformation.h"
86 #include "gromacs/mdlib/broadcaststructs.h"
87 #include "gromacs/mdlib/calc_verletbuf.h"
88 #include "gromacs/mdlib/dispersioncorrection.h"
89 #include "gromacs/mdlib/enerdata_utils.h"
90 #include "gromacs/mdlib/force.h"
91 #include "gromacs/mdlib/forcerec.h"
92 #include "gromacs/mdlib/gmx_omp_nthreads.h"
93 #include "gromacs/mdlib/makeconstraints.h"
94 #include "gromacs/mdlib/md_support.h"
95 #include "gromacs/mdlib/mdatoms.h"
96 #include "gromacs/mdlib/membed.h"
97 #include "gromacs/mdlib/ppforceworkload.h"
98 #include "gromacs/mdlib/qmmm.h"
99 #include "gromacs/mdlib/sighandler.h"
100 #include "gromacs/mdlib/stophandler.h"
101 #include "gromacs/mdrun/mdmodules.h"
102 #include "gromacs/mdrun/simulationcontext.h"
103 #include "gromacs/mdrunutility/handlerestart.h"
104 #include "gromacs/mdrunutility/logging.h"
105 #include "gromacs/mdrunutility/multisim.h"
106 #include "gromacs/mdrunutility/printtime.h"
107 #include "gromacs/mdrunutility/threadaffinity.h"
108 #include "gromacs/mdtypes/commrec.h"
109 #include "gromacs/mdtypes/enerdata.h"
110 #include "gromacs/mdtypes/fcdata.h"
111 #include "gromacs/mdtypes/inputrec.h"
112 #include "gromacs/mdtypes/md_enums.h"
113 #include "gromacs/mdtypes/mdrunoptions.h"
114 #include "gromacs/mdtypes/observableshistory.h"
115 #include "gromacs/mdtypes/state.h"
116 #include "gromacs/nbnxm/gpu_data_mgmt.h"
117 #include "gromacs/nbnxm/nbnxm.h"
118 #include "gromacs/nbnxm/pairlist_tuning.h"
119 #include "gromacs/pbcutil/pbc.h"
120 #include "gromacs/pulling/output.h"
121 #include "gromacs/pulling/pull.h"
122 #include "gromacs/pulling/pull_rotation.h"
123 #include "gromacs/restraint/manager.h"
124 #include "gromacs/restraint/restraintmdmodule.h"
125 #include "gromacs/restraint/restraintpotential.h"
126 #include "gromacs/swap/swapcoords.h"
127 #include "gromacs/taskassignment/decidegpuusage.h"
128 #include "gromacs/taskassignment/resourcedivision.h"
129 #include "gromacs/taskassignment/taskassignment.h"
130 #include "gromacs/taskassignment/usergpuids.h"
131 #include "gromacs/timing/gpu_timing.h"
132 #include "gromacs/timing/wallcycle.h"
133 #include "gromacs/timing/wallcyclereporting.h"
134 #include "gromacs/topology/mtop_util.h"
135 #include "gromacs/trajectory/trajectoryframe.h"
136 #include "gromacs/utility/basenetwork.h"
137 #include "gromacs/utility/cstringutil.h"
138 #include "gromacs/utility/exceptions.h"
139 #include "gromacs/utility/fatalerror.h"
140 #include "gromacs/utility/filestream.h"
141 #include "gromacs/utility/gmxassert.h"
142 #include "gromacs/utility/gmxmpi.h"
143 #include "gromacs/utility/logger.h"
144 #include "gromacs/utility/loggerbuilder.h"
145 #include "gromacs/utility/physicalnodecommunicator.h"
146 #include "gromacs/utility/pleasecite.h"
147 #include "gromacs/utility/programcontext.h"
148 #include "gromacs/utility/smalloc.h"
149 #include "gromacs/utility/stringutil.h"
151 #include "legacysimulator.h"
152 #include "replicaexchange.h"
155 #include "corewrap.h"
161 /*! \brief Log if development feature flags are encountered
163 * The use of dev features indicated by environment variables is logged
164 * in order to ensure that runs with such featrues enabled can be identified
165 * from their log and standard output.
167 * \param[in] mdlog Logger object.
169 static void reportDevelopmentFeatures(const gmx::MDLogger &mdlog)
171 const bool enableGpuBufOps = (getenv("GMX_USE_GPU_BUFFER_OPS") != nullptr);
172 const bool useGpuUpdateConstrain = (getenv("GMX_UPDATE_CONSTRAIN_GPU") != nullptr);
176 GMX_LOG(mdlog.warning).asParagraph().appendTextFormatted(
177 "NOTE: This run uses the 'GPU buffer ops' feature, enabled by the GMX_USE_GPU_BUFFER_OPS environment variable.");
180 if (useGpuUpdateConstrain)
182 GMX_LOG(mdlog.warning).asParagraph().appendTextFormatted(
183 "NOTE: This run uses the 'GPU update/constraints' feature, enabled by the GMX_UPDATE_CONSTRAIN_GPU environment variable.");
187 /*! \brief Barrier for safe simultaneous thread access to mdrunner data
189 * Used to ensure that the master thread does not modify mdrunner during copy
190 * on the spawned threads. */
191 static void threadMpiMdrunnerAccessBarrier()
194 MPI_Barrier(MPI_COMM_WORLD);
198 Mdrunner Mdrunner::cloneOnSpawnedThread() const
200 auto newRunner = Mdrunner(std::make_unique<MDModules>());
202 // All runners in the same process share a restraint manager resource because it is
203 // part of the interface to the client code, which is associated only with the
204 // original thread. Handles to the same resources can be obtained by copy.
206 newRunner.restraintManager_ = std::make_unique<RestraintManager>(*restraintManager_);
209 // Copy original cr pointer before master thread can pass the thread barrier
210 newRunner.cr = reinitialize_commrec_for_this_thread(cr);
212 // Copy members of master runner.
213 // \todo Replace with builder when Simulation context and/or runner phases are better defined.
214 // Ref https://redmine.gromacs.org/issues/2587 and https://redmine.gromacs.org/issues/2375
215 newRunner.hw_opt = hw_opt;
216 newRunner.filenames = filenames;
218 newRunner.oenv = oenv;
219 newRunner.mdrunOptions = mdrunOptions;
220 newRunner.domdecOptions = domdecOptions;
221 newRunner.nbpu_opt = nbpu_opt;
222 newRunner.pme_opt = pme_opt;
223 newRunner.pme_fft_opt = pme_fft_opt;
224 newRunner.bonded_opt = bonded_opt;
225 newRunner.nstlist_cmdline = nstlist_cmdline;
226 newRunner.replExParams = replExParams;
227 newRunner.pforce = pforce;
229 newRunner.startingBehavior = startingBehavior;
230 newRunner.stopHandlerBuilder_ = std::make_unique<StopHandlerBuilder>(*stopHandlerBuilder_);
232 threadMpiMdrunnerAccessBarrier();
234 GMX_RELEASE_ASSERT(!MASTER(newRunner.cr), "cloneOnSpawnedThread should only be called on spawned threads");
239 /*! \brief The callback used for running on spawned threads.
241 * Obtains the pointer to the master mdrunner object from the one
242 * argument permitted to the thread-launch API call, copies it to make
243 * a new runner for this thread, reinitializes necessary data, and
244 * proceeds to the simulation. */
245 static void mdrunner_start_fn(const void *arg)
249 auto masterMdrunner = reinterpret_cast<const gmx::Mdrunner *>(arg);
250 /* copy the arg list to make sure that it's thread-local. This
251 doesn't copy pointed-to items, of course; fnm, cr and fplog
252 are reset in the call below, all others should be const. */
253 gmx::Mdrunner mdrunner = masterMdrunner->cloneOnSpawnedThread();
256 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR;
260 /*! \brief Start thread-MPI threads.
262 * Called by mdrunner() to start a specific number of threads
263 * (including the main thread) for thread-parallel runs. This in turn
264 * calls mdrunner() for each thread. All options are the same as for
266 t_commrec *Mdrunner::spawnThreads(int numThreadsToLaunch) const
269 /* first check whether we even need to start tMPI */
270 if (numThreadsToLaunch < 2)
276 /* now spawn new threads that start mdrunner_start_fn(), while
277 the main thread returns. Thread affinity is handled later. */
278 if (tMPI_Init_fn(TRUE, numThreadsToLaunch, TMPI_AFFINITY_NONE,
279 mdrunner_start_fn, static_cast<const void*>(this)) != TMPI_SUCCESS)
281 GMX_THROW(gmx::InternalError("Failed to spawn thread-MPI threads"));
284 threadMpiMdrunnerAccessBarrier();
286 GMX_UNUSED_VALUE(mdrunner_start_fn);
289 return reinitialize_commrec_for_this_thread(cr);
294 /*! \brief Initialize variables for Verlet scheme simulation */
295 static void prepare_verlet_scheme(FILE *fplog,
299 const gmx_mtop_t *mtop,
301 bool makeGpuPairList,
302 const gmx::CpuInfo &cpuinfo)
304 /* For NVE simulations, we will retain the initial list buffer */
305 if (EI_DYNAMICS(ir->eI) &&
306 ir->verletbuf_tol > 0 &&
307 !(EI_MD(ir->eI) && ir->etc == etcNO))
309 /* Update the Verlet buffer size for the current run setup */
311 /* Here we assume SIMD-enabled kernels are being used. But as currently
312 * calc_verlet_buffer_size gives the same results for 4x8 and 4x4
313 * and 4x2 gives a larger buffer than 4x4, this is ok.
315 ListSetupType listType = (makeGpuPairList ? ListSetupType::Gpu : ListSetupType::CpuSimdWhenSupported);
316 VerletbufListSetup listSetup = verletbufGetSafeListSetup(listType);
318 const real rlist_new =
319 calcVerletBufferSize(*mtop, det(box), *ir, ir->nstlist, ir->nstlist - 1, -1, listSetup);
321 if (rlist_new != ir->rlist)
323 if (fplog != nullptr)
325 fprintf(fplog, "\nChanging rlist from %g to %g for non-bonded %dx%d atom kernels\n\n",
326 ir->rlist, rlist_new,
327 listSetup.cluster_size_i, listSetup.cluster_size_j);
329 ir->rlist = rlist_new;
333 if (nstlist_cmdline > 0 && (!EI_DYNAMICS(ir->eI) || ir->verletbuf_tol <= 0))
335 gmx_fatal(FARGS, "Can not set nstlist without %s",
336 !EI_DYNAMICS(ir->eI) ? "dynamics" : "verlet-buffer-tolerance");
339 if (EI_DYNAMICS(ir->eI))
341 /* Set or try nstlist values */
342 increaseNstlist(fplog, cr, ir, nstlist_cmdline, mtop, box, makeGpuPairList, cpuinfo);
346 /*! \brief Override the nslist value in inputrec
348 * with value passed on the command line (if any)
350 static void override_nsteps_cmdline(const gmx::MDLogger &mdlog,
351 int64_t nsteps_cmdline,
356 /* override with anything else than the default -2 */
357 if (nsteps_cmdline > -2)
359 char sbuf_steps[STEPSTRSIZE];
360 char sbuf_msg[STRLEN];
362 ir->nsteps = nsteps_cmdline;
363 if (EI_DYNAMICS(ir->eI) && nsteps_cmdline != -1)
365 sprintf(sbuf_msg, "Overriding nsteps with value passed on the command line: %s steps, %.3g ps",
366 gmx_step_str(nsteps_cmdline, sbuf_steps),
367 fabs(nsteps_cmdline*ir->delta_t));
371 sprintf(sbuf_msg, "Overriding nsteps with value passed on the command line: %s steps",
372 gmx_step_str(nsteps_cmdline, sbuf_steps));
375 GMX_LOG(mdlog.warning).asParagraph().appendText(sbuf_msg);
377 else if (nsteps_cmdline < -2)
379 gmx_fatal(FARGS, "Invalid nsteps value passed on the command line: %" PRId64,
382 /* Do nothing if nsteps_cmdline == -2 */
388 /*! \brief Return whether GPU acceleration of nonbondeds is supported with the given settings.
390 * If not, and if a warning may be issued, logs a warning about
391 * falling back to CPU code. With thread-MPI, only the first
392 * call to this function should have \c issueWarning true. */
393 static bool gpuAccelerationOfNonbondedIsUseful(const MDLogger &mdlog,
394 const t_inputrec *ir,
397 if (ir->opts.ngener - ir->nwall > 1)
399 /* The GPU code does not support more than one energy group.
400 * If the user requested GPUs explicitly, a fatal error is given later.
404 GMX_LOG(mdlog.warning).asParagraph()
405 .appendText("Multiple energy groups is not implemented for GPUs, falling back to the CPU. "
406 "For better performance, run on the GPU without energy groups and then do "
407 "gmx mdrun -rerun option on the trajectory with an energy group .tpr file.");
414 //! Initializes the logger for mdrun.
415 static gmx::LoggerOwner buildLogger(FILE *fplog, const t_commrec *cr)
417 gmx::LoggerBuilder builder;
418 if (fplog != nullptr)
420 builder.addTargetFile(gmx::MDLogger::LogLevel::Info, fplog);
422 if (cr == nullptr || SIMMASTER(cr))
424 builder.addTargetStream(gmx::MDLogger::LogLevel::Warning,
425 &gmx::TextOutputFile::standardError());
427 return builder.build();
430 //! Make a TaskTarget from an mdrun argument string.
431 static TaskTarget findTaskTarget(const char *optionString)
433 TaskTarget returnValue = TaskTarget::Auto;
435 if (strncmp(optionString, "auto", 3) == 0)
437 returnValue = TaskTarget::Auto;
439 else if (strncmp(optionString, "cpu", 3) == 0)
441 returnValue = TaskTarget::Cpu;
443 else if (strncmp(optionString, "gpu", 3) == 0)
445 returnValue = TaskTarget::Gpu;
449 GMX_ASSERT(false, "Option string should have been checked for sanity already");
455 //! Finish run, aggregate data to print performance info.
456 static void finish_run(FILE *fplog,
457 const gmx::MDLogger &mdlog,
459 const t_inputrec *inputrec,
460 t_nrnb nrnb[], gmx_wallcycle_t wcycle,
461 gmx_walltime_accounting_t walltime_accounting,
462 nonbonded_verlet_t *nbv,
463 const gmx_pme_t *pme,
467 double nbfs = 0, mflop = 0;
469 elapsed_time_over_all_ranks,
470 elapsed_time_over_all_threads,
471 elapsed_time_over_all_threads_over_all_ranks;
472 /* Control whether it is valid to print a report. Only the
473 simulation master may print, but it should not do so if the run
474 terminated e.g. before a scheduled reset step. This is
475 complicated by the fact that PME ranks are unaware of the
476 reason why they were sent a pmerecvqxFINISH. To avoid
477 communication deadlocks, we always do the communication for the
478 report, even if we've decided not to write the report, because
479 how long it takes to finish the run is not important when we've
480 decided not to report on the simulation performance.
482 Further, we only report performance for dynamical integrators,
483 because those are the only ones for which we plan to
484 consider doing any optimizations. */
485 bool printReport = EI_DYNAMICS(inputrec->eI) && SIMMASTER(cr);
487 if (printReport && !walltime_accounting_get_valid_finish(walltime_accounting))
489 GMX_LOG(mdlog.warning).asParagraph().appendText("Simulation ended prematurely, no performance report will be written.");
494 std::unique_ptr<t_nrnb> nrnbTotalStorage;
497 nrnbTotalStorage = std::make_unique<t_nrnb>();
498 nrnb_tot = nrnbTotalStorage.get();
500 MPI_Allreduce(nrnb->n, nrnb_tot->n, eNRNB, MPI_DOUBLE, MPI_SUM,
509 elapsed_time = walltime_accounting_get_time_since_reset(walltime_accounting);
510 elapsed_time_over_all_threads = walltime_accounting_get_time_since_reset_over_all_threads(walltime_accounting);
514 /* reduce elapsed_time over all MPI ranks in the current simulation */
515 MPI_Allreduce(&elapsed_time,
516 &elapsed_time_over_all_ranks,
517 1, MPI_DOUBLE, MPI_SUM,
519 elapsed_time_over_all_ranks /= cr->nnodes;
520 /* Reduce elapsed_time_over_all_threads over all MPI ranks in the
521 * current simulation. */
522 MPI_Allreduce(&elapsed_time_over_all_threads,
523 &elapsed_time_over_all_threads_over_all_ranks,
524 1, MPI_DOUBLE, MPI_SUM,
530 elapsed_time_over_all_ranks = elapsed_time;
531 elapsed_time_over_all_threads_over_all_ranks = elapsed_time_over_all_threads;
536 print_flop(fplog, nrnb_tot, &nbfs, &mflop);
539 if (thisRankHasDuty(cr, DUTY_PP) && DOMAINDECOMP(cr))
541 print_dd_statistics(cr, inputrec, fplog);
544 /* TODO Move the responsibility for any scaling by thread counts
545 * to the code that handled the thread region, so that there's a
546 * mechanism to keep cycle counting working during the transition
547 * to task parallelism. */
548 int nthreads_pp = gmx_omp_nthreads_get(emntNonbonded);
549 int nthreads_pme = gmx_omp_nthreads_get(emntPME);
550 wallcycle_scale_by_num_threads(wcycle, thisRankHasDuty(cr, DUTY_PME) && !thisRankHasDuty(cr, DUTY_PP), nthreads_pp, nthreads_pme);
551 auto cycle_sum(wallcycle_sum(cr, wcycle));
555 auto nbnxn_gpu_timings = (nbv != nullptr && nbv->useGpu()) ? Nbnxm::gpu_get_timings(nbv->gpu_nbv) : nullptr;
556 gmx_wallclock_gpu_pme_t pme_gpu_timings = {};
558 if (pme_gpu_task_enabled(pme))
560 pme_gpu_get_timings(pme, &pme_gpu_timings);
562 wallcycle_print(fplog, mdlog, cr->nnodes, cr->npmenodes, nthreads_pp, nthreads_pme,
563 elapsed_time_over_all_ranks,
568 if (EI_DYNAMICS(inputrec->eI))
570 delta_t = inputrec->delta_t;
575 print_perf(fplog, elapsed_time_over_all_threads_over_all_ranks,
576 elapsed_time_over_all_ranks,
577 walltime_accounting_get_nsteps_done_since_reset(walltime_accounting),
578 delta_t, nbfs, mflop);
582 print_perf(stderr, elapsed_time_over_all_threads_over_all_ranks,
583 elapsed_time_over_all_ranks,
584 walltime_accounting_get_nsteps_done_since_reset(walltime_accounting),
585 delta_t, nbfs, mflop);
590 int Mdrunner::mdrunner()
593 t_forcerec *fr = nullptr;
594 t_fcdata *fcd = nullptr;
595 real ewaldcoeff_q = 0;
596 real ewaldcoeff_lj = 0;
597 int nChargePerturbed = -1, nTypePerturbed = 0;
598 gmx_wallcycle_t wcycle;
599 gmx_walltime_accounting_t walltime_accounting = nullptr;
600 gmx_membed_t * membed = nullptr;
601 gmx_hw_info_t *hwinfo = nullptr;
603 /* CAUTION: threads may be started later on in this function, so
604 cr doesn't reflect the final parallel state right now */
605 t_inputrec inputrecInstance;
606 t_inputrec *inputrec = &inputrecInstance;
609 bool doMembed = opt2bSet("-membed", filenames.size(), filenames.data());
610 bool doRerun = mdrunOptions.rerun;
612 // Handle task-assignment related user options.
613 EmulateGpuNonbonded emulateGpuNonbonded = (getenv("GMX_EMULATE_GPU") != nullptr ?
614 EmulateGpuNonbonded::Yes : EmulateGpuNonbonded::No);
616 std::vector<int> userGpuTaskAssignment;
619 userGpuTaskAssignment = parseUserTaskAssignmentString(hw_opt.userGpuTaskAssignment);
621 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR;
622 auto nonbondedTarget = findTaskTarget(nbpu_opt);
623 auto pmeTarget = findTaskTarget(pme_opt);
624 auto pmeFftTarget = findTaskTarget(pme_fft_opt);
625 auto bondedTarget = findTaskTarget(bonded_opt);
626 PmeRunMode pmeRunMode = PmeRunMode::None;
628 // Here we assume that SIMMASTER(cr) does not change even after the
629 // threads are started.
631 FILE *fplog = nullptr;
632 // If we are appending, we don't write log output because we need
633 // to check that the old log file matches what the checkpoint file
634 // expects. Otherwise, we should start to write log output now if
635 // there is a file ready for it.
636 if (logFileHandle != nullptr && startingBehavior != StartingBehavior::RestartWithAppending)
638 fplog = gmx_fio_getfp(logFileHandle);
640 gmx::LoggerOwner logOwner(buildLogger(fplog, cr));
641 gmx::MDLogger mdlog(logOwner.logger());
643 // report any development features that may be enabled by environment variables
644 reportDevelopmentFeatures(mdlog);
646 // With thread-MPI, the communicator changes after threads are
647 // launched, so this is rebuilt for the master rank at that
648 // time. The non-master ranks are fine to keep the one made here.
649 PhysicalNodeCommunicator physicalNodeComm(MPI_COMM_WORLD, gmx_physicalnode_id_hash());
650 hwinfo = gmx_detect_hardware(mdlog, physicalNodeComm);
652 gmx_print_detected_hardware(fplog, isMasterSimMasterRank(ms, MASTER(cr)), mdlog, hwinfo);
654 std::vector<int> gpuIdsToUse = makeGpuIdsToUse(hwinfo->gpu_info, hw_opt.gpuIdsAvailable);
656 // Print citation requests after all software/hardware printing
657 pleaseCiteGromacs(fplog);
659 std::unique_ptr<t_state> globalState;
663 /* Only the master rank has the global state */
664 globalState = std::make_unique<t_state>();
666 /* Read (nearly) all data required for the simulation */
667 read_tpx_state(ftp2fn(efTPR, filenames.size(), filenames.data()), inputrec, globalState.get(), &mtop);
670 /* Check and update the hardware options for internal consistency */
671 checkAndUpdateHardwareOptions(mdlog, &hw_opt, SIMMASTER(cr), domdecOptions.numPmeRanks);
673 if (GMX_THREAD_MPI && SIMMASTER(cr))
675 bool useGpuForNonbonded = false;
676 bool useGpuForPme = false;
679 // If the user specified the number of ranks, then we must
680 // respect that, but in default mode, we need to allow for
681 // the number of GPUs to choose the number of ranks.
682 auto canUseGpuForNonbonded = buildSupportsNonbondedOnGpu(nullptr);
683 useGpuForNonbonded = decideWhetherToUseGpusForNonbondedWithThreadMpi
684 (nonbondedTarget, gpuIdsToUse, userGpuTaskAssignment, emulateGpuNonbonded,
685 canUseGpuForNonbonded,
686 gpuAccelerationOfNonbondedIsUseful(mdlog, inputrec, GMX_THREAD_MPI),
687 hw_opt.nthreads_tmpi);
688 useGpuForPme = decideWhetherToUseGpusForPmeWithThreadMpi
689 (useGpuForNonbonded, pmeTarget, gpuIdsToUse, userGpuTaskAssignment,
690 *hwinfo, *inputrec, mtop, hw_opt.nthreads_tmpi, domdecOptions.numPmeRanks);
693 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR;
695 /* Determine how many thread-MPI ranks to start.
697 * TODO Over-writing the user-supplied value here does
698 * prevent any possible subsequent checks from working
700 hw_opt.nthreads_tmpi = get_nthreads_mpi(hwinfo,
709 // Now start the threads for thread MPI.
710 cr = spawnThreads(hw_opt.nthreads_tmpi);
711 /* The main thread continues here with a new cr. We don't deallocate
712 the old cr because other threads may still be reading it. */
713 // TODO Both master and spawned threads call dup_tfn and
714 // reinitialize_commrec_for_this_thread. Find a way to express
716 physicalNodeComm = PhysicalNodeCommunicator(MPI_COMM_WORLD, gmx_physicalnode_id_hash());
718 // END OF CAUTION: cr and physicalNodeComm are now reliable
722 /* now broadcast everything to the non-master nodes/threads: */
723 init_parallel(cr, inputrec, &mtop);
726 // Now each rank knows the inputrec that SIMMASTER read and used,
727 // and (if applicable) cr->nnodes has been assigned the number of
728 // thread-MPI ranks that have been chosen. The ranks can now all
729 // run the task-deciding functions and will agree on the result
730 // without needing to communicate.
732 // TODO Should we do the communication in debug mode to support
733 // having an assertion?
735 // Note that these variables describe only their own node.
737 // Note that when bonded interactions run on a GPU they always run
738 // alongside a nonbonded task, so do not influence task assignment
739 // even though they affect the force calculation workload.
740 bool useGpuForNonbonded = false;
741 bool useGpuForPme = false;
742 bool useGpuForBonded = false;
745 // It's possible that there are different numbers of GPUs on
746 // different nodes, which is the user's responsibilty to
747 // handle. If unsuitable, we will notice that during task
749 bool gpusWereDetected = hwinfo->ngpu_compatible_tot > 0;
750 auto canUseGpuForNonbonded = buildSupportsNonbondedOnGpu(nullptr);
751 useGpuForNonbonded = decideWhetherToUseGpusForNonbonded(nonbondedTarget, userGpuTaskAssignment,
753 canUseGpuForNonbonded,
754 gpuAccelerationOfNonbondedIsUseful(mdlog, inputrec, !GMX_THREAD_MPI),
756 useGpuForPme = decideWhetherToUseGpusForPme(useGpuForNonbonded, pmeTarget, userGpuTaskAssignment,
757 *hwinfo, *inputrec, mtop,
758 cr->nnodes, domdecOptions.numPmeRanks,
760 auto canUseGpuForBonded = buildSupportsGpuBondeds(nullptr) && inputSupportsGpuBondeds(*inputrec, mtop, nullptr);
762 decideWhetherToUseGpusForBonded(useGpuForNonbonded, useGpuForPme,
763 bondedTarget, canUseGpuForBonded,
764 EVDW_PME(inputrec->vdwtype),
765 EEL_PME_EWALD(inputrec->coulombtype),
766 domdecOptions.numPmeRanks, gpusWereDetected);
768 pmeRunMode = (useGpuForPme ? PmeRunMode::GPU : PmeRunMode::CPU);
769 if (pmeRunMode == PmeRunMode::GPU)
771 if (pmeFftTarget == TaskTarget::Cpu)
773 pmeRunMode = PmeRunMode::Mixed;
776 else if (pmeFftTarget == TaskTarget::Gpu)
778 gmx_fatal(FARGS, "Assigning FFTs to GPU requires PME to be assigned to GPU as well. With PME on CPU you should not be using -pmefft.");
781 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR;
784 // TODO: hide restraint implementation details from Mdrunner.
785 // There is nothing unique about restraints at this point as far as the
786 // Mdrunner is concerned. The Mdrunner should just be getting a sequence of
787 // factory functions from the SimulationContext on which to call mdModules_->add().
788 // TODO: capture all restraints into a single RestraintModule, passed to the runner builder.
789 for (auto && restraint : restraintManager_->getRestraints())
791 auto module = RestraintMDModule::create(restraint,
793 mdModules_->add(std::move(module));
796 // TODO: Error handling
797 mdModules_->assignOptionsToModules(*inputrec->params, nullptr);
799 if (fplog != nullptr)
801 pr_inputrec(fplog, 0, "Input Parameters", inputrec, FALSE);
802 fprintf(fplog, "\n");
807 /* In rerun, set velocities to zero if present */
808 if (doRerun && ((globalState->flags & (1 << estV)) != 0))
810 // rerun does not use velocities
811 GMX_LOG(mdlog.info).asParagraph().appendText(
812 "Rerun trajectory contains velocities. Rerun does only evaluate "
813 "potential energy and forces. The velocities will be ignored.");
814 for (int i = 0; i < globalState->natoms; i++)
816 clear_rvec(globalState->v[i]);
818 globalState->flags &= ~(1 << estV);
821 /* now make sure the state is initialized and propagated */
822 set_state_entries(globalState.get(), inputrec);
825 /* NM and TPI parallelize over force/energy calculations, not atoms,
826 * so we need to initialize and broadcast the global state.
828 if (inputrec->eI == eiNM || inputrec->eI == eiTPI)
832 globalState = std::make_unique<t_state>();
834 broadcastStateWithoutDynamics(cr, globalState.get());
837 /* A parallel command line option consistency check that we can
838 only do after any threads have started. */
839 if (!PAR(cr) && (domdecOptions.numCells[XX] > 1 ||
840 domdecOptions.numCells[YY] > 1 ||
841 domdecOptions.numCells[ZZ] > 1 ||
842 domdecOptions.numPmeRanks > 0))
845 "The -dd or -npme option request a parallel simulation, "
847 "but %s was compiled without threads or MPI enabled", output_env_get_program_display_name(oenv));
850 "but the number of MPI-threads (option -ntmpi) is not set or is 1");
852 "but %s was not started through mpirun/mpiexec or only one rank was requested through mpirun/mpiexec", output_env_get_program_display_name(oenv));
858 (EI_ENERGY_MINIMIZATION(inputrec->eI) || eiNM == inputrec->eI))
860 gmx_fatal(FARGS, "The .mdp file specified an energy mininization or normal mode algorithm, and these are not compatible with mdrun -rerun");
863 if (!(EEL_PME(inputrec->coulombtype) || EVDW_PME(inputrec->vdwtype)))
865 if (domdecOptions.numPmeRanks > 0)
867 gmx_fatal_collective(FARGS, cr->mpi_comm_mysim, MASTER(cr),
868 "PME-only ranks are requested, but the system does not use PME for electrostatics or LJ");
871 domdecOptions.numPmeRanks = 0;
874 if (useGpuForNonbonded && domdecOptions.numPmeRanks < 0)
876 /* With NB GPUs we don't automatically use PME-only CPU ranks. PME ranks can
877 * improve performance with many threads per GPU, since our OpenMP
878 * scaling is bad, but it's difficult to automate the setup.
880 domdecOptions.numPmeRanks = 0;
884 if (domdecOptions.numPmeRanks < 0)
886 domdecOptions.numPmeRanks = 0;
887 // TODO possibly print a note that one can opt-in for a separate PME GPU rank?
891 GMX_RELEASE_ASSERT(domdecOptions.numPmeRanks <= 1, "PME GPU decomposition is not supported");
898 fcRegisterSteps(inputrec->nsteps, inputrec->init_step);
902 /* NMR restraints must be initialized before load_checkpoint,
903 * since with time averaging the history is added to t_state.
904 * For proper consistency check we therefore need to extend
906 * So the PME-only nodes (if present) will also initialize
907 * the distance restraints.
911 /* This needs to be called before read_checkpoint to extend the state */
912 init_disres(fplog, &mtop, inputrec, cr, ms, fcd, globalState.get(), replExParams.exchangeInterval > 0);
914 init_orires(fplog, &mtop, inputrec, cr, ms, globalState.get(), &(fcd->orires));
916 auto deform = prepareBoxDeformation(globalState->box, cr, *inputrec);
918 ObservablesHistory observablesHistory = {};
920 if (startingBehavior != StartingBehavior::NewSimulation)
922 load_checkpoint(opt2fn_master("-cpi", filenames.size(), filenames.data(), cr),
924 cr, domdecOptions.numCells,
925 inputrec, globalState.get(),
927 mdrunOptions.reproducible);
929 if (startingBehavior == StartingBehavior::RestartWithAppending && logFileHandle)
931 // Now we can start normal logging to the truncated log file.
932 fplog = gmx_fio_getfp(logFileHandle);
933 prepareLogAppending(fplog);
934 logOwner = buildLogger(fplog, cr);
935 mdlog = logOwner.logger();
939 if (mdrunOptions.numStepsCommandline > -2)
941 GMX_LOG(mdlog.info).asParagraph().
942 appendText("The -nsteps functionality is deprecated, and may be removed in a future version. "
943 "Consider using gmx convert-tpr -nsteps or changing the appropriate .mdp file field.");
945 /* override nsteps with value set on the commamdline */
946 override_nsteps_cmdline(mdlog, mdrunOptions.numStepsCommandline, inputrec);
950 copy_mat(globalState->box, box);
955 gmx_bcast(sizeof(box), box, cr);
958 if (inputrec->cutoff_scheme != ecutsVERLET)
960 gmx_fatal(FARGS, "This group-scheme .tpr file can no longer be run by mdrun. Please update to the Verlet scheme, or use an earlier version of GROMACS if necessary.");
962 /* Update rlist and nstlist. */
963 prepare_verlet_scheme(fplog, cr, inputrec, nstlist_cmdline, &mtop, box,
964 useGpuForNonbonded || (emulateGpuNonbonded == EmulateGpuNonbonded::Yes), *hwinfo->cpuInfo);
966 LocalAtomSetManager atomSets;
968 if (PAR(cr) && !(EI_TPI(inputrec->eI) ||
969 inputrec->eI == eiNM))
971 cr->dd = init_domain_decomposition(mdlog, cr, domdecOptions, mdrunOptions,
973 box, positionsFromStatePointer(globalState.get()),
975 // Note that local state still does not exist yet.
979 /* PME, if used, is done on all nodes with 1D decomposition */
981 cr->duty = (DUTY_PP | DUTY_PME);
983 if (inputrec->ePBC == epbcSCREW)
986 "pbc=screw is only implemented with domain decomposition");
992 /* After possible communicator splitting in make_dd_communicators.
993 * we can set up the intra/inter node communication.
995 gmx_setup_nodecomm(fplog, cr);
1001 GMX_LOG(mdlog.warning).asParagraph().appendTextFormatted(
1002 "This is simulation %d out of %d running as a composite GROMACS\n"
1003 "multi-simulation job. Setup for this simulation:\n",
1006 GMX_LOG(mdlog.warning).appendTextFormatted(
1007 "Using %d MPI %s\n",
1010 cr->nnodes == 1 ? "thread" : "threads"
1012 cr->nnodes == 1 ? "process" : "processes"
1018 // If mdrun -pin auto honors any affinity setting that already
1019 // exists. If so, it is nice to provide feedback about whether
1020 // that existing affinity setting was from OpenMP or something
1021 // else, so we run this code both before and after we initialize
1022 // the OpenMP support.
1023 gmx_check_thread_affinity_set(mdlog,
1024 &hw_opt, hwinfo->nthreads_hw_avail, FALSE);
1025 /* Check and update the number of OpenMP threads requested */
1026 checkAndUpdateRequestedNumOpenmpThreads(&hw_opt, *hwinfo, cr, ms, physicalNodeComm.size_,
1029 gmx_omp_nthreads_init(mdlog, cr,
1030 hwinfo->nthreads_hw_avail,
1031 physicalNodeComm.size_,
1032 hw_opt.nthreads_omp,
1033 hw_opt.nthreads_omp_pme,
1034 !thisRankHasDuty(cr, DUTY_PP));
1036 // Enable FP exception detection, but not in
1037 // Release mode and not for compilers with known buggy FP
1038 // exception support (clang with any optimization) or suspected
1039 // buggy FP exception support (gcc 7.* with optimization).
1040 #if !defined NDEBUG && \
1041 !((defined __clang__ || (defined(__GNUC__) && !defined(__ICC) && __GNUC__ == 7)) \
1042 && defined __OPTIMIZE__)
1043 const bool bEnableFPE = true;
1045 const bool bEnableFPE = false;
1047 //FIXME - reconcile with gmx_feenableexcept() call from CommandLineModuleManager::run()
1050 gmx_feenableexcept();
1053 // Build a data structure that expresses which kinds of non-bonded
1054 // task are handled by this rank.
1056 // TODO Later, this might become a loop over all registered modules
1057 // relevant to the mdp inputs, to find those that have such tasks.
1059 // TODO This could move before init_domain_decomposition() as part
1060 // of refactoring that separates the responsibility for duty
1061 // assignment from setup for communication between tasks, and
1062 // setup for tasks handled with a domain (ie including short-ranged
1063 // tasks, bonded tasks, etc.).
1065 // Note that in general useGpuForNonbonded, etc. can have a value
1066 // that is inconsistent with the presence of actual GPUs on any
1067 // rank, and that is not known to be a problem until the
1068 // duty of the ranks on a node become known.
1070 // TODO Later we might need the concept of computeTasksOnThisRank,
1071 // from which we construct gpuTasksOnThisRank.
1073 // Currently the DD code assigns duty to ranks that can
1074 // include PP work that currently can be executed on a single
1075 // GPU, if present and compatible. This has to be coordinated
1076 // across PP ranks on a node, with possible multiple devices
1077 // or sharing devices on a node, either from the user
1078 // selection, or automatically.
1079 auto haveGpus = !gpuIdsToUse.empty();
1080 std::vector<GpuTask> gpuTasksOnThisRank;
1081 if (thisRankHasDuty(cr, DUTY_PP))
1083 if (useGpuForNonbonded)
1085 // Note that any bonded tasks on a GPU always accompany a
1089 gpuTasksOnThisRank.push_back(GpuTask::Nonbonded);
1091 else if (nonbondedTarget == TaskTarget::Gpu)
1093 gmx_fatal(FARGS, "Cannot run short-ranged nonbonded interactions on a GPU because no GPU is detected.");
1095 else if (bondedTarget == TaskTarget::Gpu)
1097 gmx_fatal(FARGS, "Cannot run bonded interactions on a GPU because no GPU is detected.");
1101 // TODO cr->duty & DUTY_PME should imply that a PME algorithm is active, but currently does not.
1102 if (EEL_PME(inputrec->coulombtype) && (thisRankHasDuty(cr, DUTY_PME)))
1108 gpuTasksOnThisRank.push_back(GpuTask::Pme);
1110 else if (pmeTarget == TaskTarget::Gpu)
1112 gmx_fatal(FARGS, "Cannot run PME on a GPU because no GPU is detected.");
1117 GpuTaskAssignment gpuTaskAssignment;
1120 // Produce the task assignment for this rank.
1121 gpuTaskAssignment = runTaskAssignment(gpuIdsToUse, userGpuTaskAssignment, *hwinfo,
1122 mdlog, cr, ms, physicalNodeComm, gpuTasksOnThisRank,
1123 useGpuForBonded, pmeRunMode);
1125 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR;
1127 /* Prevent other ranks from continuing after an issue was found
1128 * and reported as a fatal error.
1130 * TODO This function implements a barrier so that MPI runtimes
1131 * can organize an orderly shutdown if one of the ranks has had to
1132 * issue a fatal error in various code already run. When we have
1133 * MPI-aware error handling and reporting, this should be
1138 MPI_Barrier(cr->mpi_comm_mysim);
1144 MPI_Barrier(ms->mpi_comm_masters);
1146 /* We need another barrier to prevent non-master ranks from contiuing
1147 * when an error occured in a different simulation.
1149 MPI_Barrier(cr->mpi_comm_mysim);
1153 /* Now that we know the setup is consistent, check for efficiency */
1154 check_resource_division_efficiency(hwinfo, !gpuTaskAssignment.empty(), mdrunOptions.ntompOptionIsSet,
1157 gmx_device_info_t *nonbondedDeviceInfo = nullptr;
1159 if (thisRankHasDuty(cr, DUTY_PP))
1161 // This works because only one task of each type is currently permitted.
1162 auto nbGpuTaskMapping = std::find_if(gpuTaskAssignment.begin(), gpuTaskAssignment.end(),
1163 hasTaskType<GpuTask::Nonbonded>);
1164 if (nbGpuTaskMapping != gpuTaskAssignment.end())
1166 int nonbondedDeviceId = nbGpuTaskMapping->deviceId_;
1167 nonbondedDeviceInfo = getDeviceInfo(hwinfo->gpu_info, nonbondedDeviceId);
1168 init_gpu(nonbondedDeviceInfo);
1170 if (DOMAINDECOMP(cr))
1172 /* When we share GPUs over ranks, we need to know this for the DLB */
1173 dd_setup_dlb_resource_sharing(cr, nonbondedDeviceId);
1179 std::unique_ptr<ClfftInitializer> initializedClfftLibrary;
1181 gmx_device_info_t *pmeDeviceInfo = nullptr;
1182 // Later, this program could contain kernels that might be later
1183 // re-used as auto-tuning progresses, or subsequent simulations
1185 PmeGpuProgramStorage pmeGpuProgram;
1186 // This works because only one task of each type is currently permitted.
1187 auto pmeGpuTaskMapping = std::find_if(gpuTaskAssignment.begin(), gpuTaskAssignment.end(), hasTaskType<GpuTask::Pme>);
1188 const bool thisRankHasPmeGpuTask = (pmeGpuTaskMapping != gpuTaskAssignment.end());
1189 if (thisRankHasPmeGpuTask)
1191 pmeDeviceInfo = getDeviceInfo(hwinfo->gpu_info, pmeGpuTaskMapping->deviceId_);
1192 init_gpu(pmeDeviceInfo);
1193 pmeGpuProgram = buildPmeGpuProgram(pmeDeviceInfo);
1194 // TODO It would be nice to move this logic into the factory
1195 // function. See Redmine #2535.
1196 bool isMasterThread = !GMX_THREAD_MPI || MASTER(cr);
1197 if (pmeRunMode == PmeRunMode::GPU && !initializedClfftLibrary && isMasterThread)
1199 initializedClfftLibrary = initializeClfftLibrary();
1203 /* getting number of PP/PME threads on this MPI / tMPI rank.
1204 PME: env variable should be read only on one node to make sure it is
1205 identical everywhere;
1207 const int numThreadsOnThisRank =
1208 thisRankHasDuty(cr, DUTY_PP) ? gmx_omp_nthreads_get(emntNonbonded) : gmx_omp_nthreads_get(emntPME);
1209 checkHardwareOversubscription(numThreadsOnThisRank, cr->nodeid,
1210 *hwinfo->hardwareTopology,
1211 physicalNodeComm, mdlog);
1213 if (hw_opt.threadAffinity != ThreadAffinity::Off)
1215 /* Before setting affinity, check whether the affinity has changed
1216 * - which indicates that probably the OpenMP library has changed it
1217 * since we first checked).
1219 gmx_check_thread_affinity_set(mdlog,
1220 &hw_opt, hwinfo->nthreads_hw_avail, TRUE);
1222 int numThreadsOnThisNode, intraNodeThreadOffset;
1223 analyzeThreadsOnThisNode(physicalNodeComm, numThreadsOnThisRank, &numThreadsOnThisNode,
1224 &intraNodeThreadOffset);
1226 /* Set the CPU affinity */
1227 gmx_set_thread_affinity(mdlog, cr, &hw_opt, *hwinfo->hardwareTopology,
1228 numThreadsOnThisRank, numThreadsOnThisNode,
1229 intraNodeThreadOffset, nullptr);
1232 if (mdrunOptions.timingOptions.resetStep > -1)
1234 GMX_LOG(mdlog.info).asParagraph().
1235 appendText("The -resetstep functionality is deprecated, and may be removed in a future version.");
1237 wcycle = wallcycle_init(fplog, mdrunOptions.timingOptions.resetStep, cr);
1241 /* Master synchronizes its value of reset_counters with all nodes
1242 * including PME only nodes */
1243 int64_t reset_counters = wcycle_get_reset_counters(wcycle);
1244 gmx_bcast_sim(sizeof(reset_counters), &reset_counters, cr);
1245 wcycle_set_reset_counters(wcycle, reset_counters);
1248 // Membrane embedding must be initialized before we call init_forcerec()
1253 fprintf(stderr, "Initializing membed");
1255 /* Note that membed cannot work in parallel because mtop is
1256 * changed here. Fix this if we ever want to make it run with
1257 * multiple ranks. */
1258 membed = init_membed(fplog, filenames.size(), filenames.data(), &mtop, inputrec, globalState.get(), cr,
1260 .checkpointOptions.period);
1263 std::unique_ptr<MDAtoms> mdAtoms;
1264 std::unique_ptr<gmx_vsite_t> vsite;
1267 if (thisRankHasDuty(cr, DUTY_PP))
1269 /* Initiate forcerecord */
1270 fr = new t_forcerec;
1271 fr->forceProviders = mdModules_->initForceProviders();
1272 init_forcerec(fplog, mdlog, fr, fcd,
1273 inputrec, &mtop, cr, box,
1274 opt2fn("-table", filenames.size(), filenames.data()),
1275 opt2fn("-tablep", filenames.size(), filenames.data()),
1276 opt2fns("-tableb", filenames.size(), filenames.data()),
1277 *hwinfo, nonbondedDeviceInfo,
1283 /* Initialize the mdAtoms structure.
1284 * mdAtoms is not filled with atom data,
1285 * as this can not be done now with domain decomposition.
1287 mdAtoms = makeMDAtoms(fplog, mtop, *inputrec, thisRankHasPmeGpuTask);
1288 if (globalState && thisRankHasPmeGpuTask)
1290 // The pinning of coordinates in the global state object works, because we only use
1291 // PME on GPU without DD or on a separate PME rank, and because the local state pointer
1292 // points to the global state object without DD.
1293 // FIXME: MD and EM separately set up the local state - this should happen in the same function,
1294 // which should also perform the pinning.
1295 changePinningPolicy(&globalState->x, pme_get_pinning_policy());
1298 /* Initialize the virtual site communication */
1299 vsite = initVsite(mtop, cr);
1301 calc_shifts(box, fr->shift_vec);
1303 /* With periodic molecules the charge groups should be whole at start up
1304 * and the virtual sites should not be far from their proper positions.
1306 if (!inputrec->bContinuation && MASTER(cr) &&
1307 !(inputrec->ePBC != epbcNONE && inputrec->bPeriodicMols))
1309 /* Make molecules whole at start of run */
1310 if (fr->ePBC != epbcNONE)
1312 do_pbc_first_mtop(fplog, inputrec->ePBC, box, &mtop, globalState->x.rvec_array());
1316 /* Correct initial vsite positions are required
1317 * for the initial distribution in the domain decomposition
1318 * and for the initial shell prediction.
1320 constructVsitesGlobal(mtop, globalState->x);
1324 if (EEL_PME(fr->ic->eeltype) || EVDW_PME(fr->ic->vdwtype))
1326 ewaldcoeff_q = fr->ic->ewaldcoeff_q;
1327 ewaldcoeff_lj = fr->ic->ewaldcoeff_lj;
1332 /* This is a PME only node */
1334 GMX_ASSERT(globalState == nullptr, "We don't need the state on a PME only rank and expect it to be unitialized");
1336 ewaldcoeff_q = calc_ewaldcoeff_q(inputrec->rcoulomb, inputrec->ewald_rtol);
1337 ewaldcoeff_lj = calc_ewaldcoeff_lj(inputrec->rvdw, inputrec->ewald_rtol_lj);
1340 gmx_pme_t *sepPmeData = nullptr;
1341 // This reference hides the fact that PME data is owned by runner on PME-only ranks and by forcerec on other ranks
1342 GMX_ASSERT(thisRankHasDuty(cr, DUTY_PP) == (fr != nullptr), "Double-checking that only PME-only ranks have no forcerec");
1343 gmx_pme_t * &pmedata = fr ? fr->pmedata : sepPmeData;
1345 /* Initiate PME if necessary,
1346 * either on all nodes or on dedicated PME nodes only. */
1347 if (EEL_PME(inputrec->coulombtype) || EVDW_PME(inputrec->vdwtype))
1349 if (mdAtoms && mdAtoms->mdatoms())
1351 nChargePerturbed = mdAtoms->mdatoms()->nChargePerturbed;
1352 if (EVDW_PME(inputrec->vdwtype))
1354 nTypePerturbed = mdAtoms->mdatoms()->nTypePerturbed;
1357 if (cr->npmenodes > 0)
1359 /* The PME only nodes need to know nChargePerturbed(FEP on Q) and nTypePerturbed(FEP on LJ)*/
1360 gmx_bcast_sim(sizeof(nChargePerturbed), &nChargePerturbed, cr);
1361 gmx_bcast_sim(sizeof(nTypePerturbed), &nTypePerturbed, cr);
1364 if (thisRankHasDuty(cr, DUTY_PME))
1368 pmedata = gmx_pme_init(cr,
1369 getNumPmeDomains(cr->dd),
1371 nChargePerturbed != 0, nTypePerturbed != 0,
1372 mdrunOptions.reproducible,
1373 ewaldcoeff_q, ewaldcoeff_lj,
1374 gmx_omp_nthreads_get(emntPME),
1375 pmeRunMode, nullptr,
1376 pmeDeviceInfo, pmeGpuProgram.get(), mdlog);
1378 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR;
1383 if (EI_DYNAMICS(inputrec->eI))
1385 /* Turn on signal handling on all nodes */
1387 * (A user signal from the PME nodes (if any)
1388 * is communicated to the PP nodes.
1390 signal_handler_install();
1393 pull_t *pull_work = nullptr;
1394 if (thisRankHasDuty(cr, DUTY_PP))
1396 /* Assumes uniform use of the number of OpenMP threads */
1397 walltime_accounting = walltime_accounting_init(gmx_omp_nthreads_get(emntDefault));
1399 if (inputrec->bPull)
1401 /* Initialize pull code */
1403 init_pull(fplog, inputrec->pull, inputrec,
1404 &mtop, cr, &atomSets, inputrec->fepvals->init_lambda);
1405 if (inputrec->pull->bXOutAverage || inputrec->pull->bFOutAverage)
1407 initPullHistory(pull_work, &observablesHistory);
1409 if (EI_DYNAMICS(inputrec->eI) && MASTER(cr))
1411 init_pull_output_files(pull_work,
1412 filenames.size(), filenames.data(), oenv,
1417 std::unique_ptr<EnforcedRotation> enforcedRotation;
1420 /* Initialize enforced rotation code */
1421 enforcedRotation = init_rot(fplog,
1434 t_swap *swap = nullptr;
1435 if (inputrec->eSwapCoords != eswapNO)
1437 /* Initialize ion swapping code */
1438 swap = init_swapcoords(fplog, inputrec,
1439 opt2fn_master("-swap", filenames.size(), filenames.data(), cr),
1440 &mtop, globalState.get(), &observablesHistory,
1441 cr, &atomSets, oenv, mdrunOptions,
1445 /* Let makeConstraints know whether we have essential dynamics constraints.
1446 * TODO: inputrec should tell us whether we use an algorithm, not a file option or the checkpoint
1448 bool doEssentialDynamics = (opt2fn_null("-ei", filenames.size(), filenames.data()) != nullptr
1449 || observablesHistory.edsamHistory);
1450 auto constr = makeConstraints(mtop, *inputrec, pull_work, doEssentialDynamics,
1451 fplog, *mdAtoms->mdatoms(),
1452 cr, ms, &nrnb, wcycle, fr->bMolPBC);
1454 /* Energy terms and groups */
1455 gmx_enerdata_t enerd(mtop.groups.groups[SimulationAtomGroupType::EnergyOutput].size(), inputrec->fepvals->n_lambda);
1457 /* Set up interactive MD (IMD) */
1458 auto imdSession = makeImdSession(inputrec, cr, wcycle, &enerd, ms, &mtop, mdlog,
1459 MASTER(cr) ? globalState->x.rvec_array() : nullptr,
1460 filenames.size(), filenames.data(), oenv, mdrunOptions.imdOptions,
1463 if (DOMAINDECOMP(cr))
1465 GMX_RELEASE_ASSERT(fr, "fr was NULL while cr->duty was DUTY_PP");
1466 /* This call is not included in init_domain_decomposition mainly
1467 * because fr->cginfo_mb is set later.
1469 dd_init_bondeds(fplog, cr->dd, &mtop, vsite.get(), inputrec,
1470 domdecOptions.checkBondedInteractions,
1474 // TODO This is not the right place to manage the lifetime of
1475 // this data structure, but currently it's the easiest way to
1476 // make it work. Later, it should probably be made/updated
1477 // after the workload for the lifetime of a PP domain is
1479 PpForceWorkload ppForceWorkload;
1481 GMX_ASSERT(stopHandlerBuilder_, "Runner must provide StopHandlerBuilder to simulator.");
1482 /* Now do whatever the user wants us to do (how flexible...) */
1483 LegacySimulator simulator {
1484 fplog, cr, ms, mdlog, static_cast<int>(filenames.size()), filenames.data(),
1488 vsite.get(), constr.get(),
1489 enforcedRotation ? enforcedRotation->getLegacyEnfrot() : nullptr,
1491 mdModules_->outputProvider(),
1492 inputrec, imdSession.get(), pull_work, swap, &mtop,
1495 &observablesHistory,
1496 mdAtoms.get(), &nrnb, wcycle, fr,
1501 walltime_accounting,
1502 std::move(stopHandlerBuilder_)
1504 simulator.run(inputrec->eI, doRerun);
1506 if (inputrec->bPull)
1508 finish_pull(pull_work);
1510 finish_swapcoords(swap);
1514 GMX_RELEASE_ASSERT(pmedata, "pmedata was NULL while cr->duty was not DUTY_PP");
1516 walltime_accounting = walltime_accounting_init(gmx_omp_nthreads_get(emntPME));
1517 gmx_pmeonly(pmedata, cr, &nrnb, wcycle, walltime_accounting, inputrec, pmeRunMode);
1520 wallcycle_stop(wcycle, ewcRUN);
1522 /* Finish up, write some stuff
1523 * if rerunMD, don't write last frame again
1525 finish_run(fplog, mdlog, cr,
1526 inputrec, &nrnb, wcycle, walltime_accounting,
1527 fr ? fr->nbv.get() : nullptr,
1529 EI_DYNAMICS(inputrec->eI) && !isMultiSim(ms));
1531 // clean up cycle counter
1532 wallcycle_destroy(wcycle);
1537 gmx_pme_destroy(pmedata);
1541 // FIXME: this is only here to manually unpin mdAtoms->chargeA_ and state->x,
1542 // before we destroy the GPU context(s) in free_gpu_resources().
1543 // Pinned buffers are associated with contexts in CUDA.
1544 // As soon as we destroy GPU contexts after mdrunner() exits, these lines should go.
1545 mdAtoms.reset(nullptr);
1546 globalState.reset(nullptr);
1547 mdModules_.reset(nullptr); // destruct force providers here as they might also use the GPU
1549 /* Free GPU memory and set a physical node tMPI barrier (which should eventually go away) */
1550 free_gpu_resources(fr, physicalNodeComm, hwinfo->gpu_info);
1551 free_gpu(nonbondedDeviceInfo);
1552 free_gpu(pmeDeviceInfo);
1553 done_forcerec(fr, mtop.molblock.size());
1558 free_membed(membed);
1561 /* Does what it says */
1562 print_date_and_time(fplog, cr->nodeid, "Finished mdrun", gmx_gettime());
1563 walltime_accounting_destroy(walltime_accounting);
1565 // Ensure log file content is written
1568 gmx_fio_flush(logFileHandle);
1571 /* Reset FPEs (important for unit tests) by disabling them. Assumes no
1572 * exceptions were enabled before function was called. */
1575 gmx_fedisableexcept();
1578 auto rc = static_cast<int>(gmx_get_stop_condition());
1581 /* we need to join all threads. The sub-threads join when they
1582 exit this function, but the master thread needs to be told to
1584 if (PAR(cr) && MASTER(cr))
1588 //TODO free commrec in MPI simulations
1594 Mdrunner::~Mdrunner()
1596 // Clean up of the Manager.
1597 // This will end up getting called on every thread-MPI rank, which is unnecessary,
1598 // but okay as long as threads synchronize some time before adding or accessing
1599 // a new set of restraints.
1600 if (restraintManager_)
1602 restraintManager_->clear();
1603 GMX_ASSERT(restraintManager_->countRestraints() == 0,
1604 "restraints added during runner life time should be cleared at runner destruction.");
1608 void Mdrunner::addPotential(std::shared_ptr<gmx::IRestraintPotential> puller,
1611 GMX_ASSERT(restraintManager_, "Mdrunner must have a restraint manager.");
1612 // Not sure if this should be logged through the md logger or something else,
1613 // but it is helpful to have some sort of INFO level message sent somewhere.
1614 // std::cout << "Registering restraint named " << name << std::endl;
1616 // When multiple restraints are used, it may be wasteful to register them separately.
1617 // Maybe instead register an entire Restraint Manager as a force provider.
1618 restraintManager_->addToSpec(std::move(puller),
1622 Mdrunner::Mdrunner(std::unique_ptr<MDModules> mdModules)
1623 : mdModules_(std::move(mdModules))
1627 Mdrunner::Mdrunner(Mdrunner &&) noexcept = default;
1629 //NOLINTNEXTLINE(performance-noexcept-move-constructor) working around GCC bug 58265
1630 Mdrunner &Mdrunner::operator=(Mdrunner && /*handle*/) noexcept(BUGFREE_NOEXCEPT_STRING) = default;
1632 class Mdrunner::BuilderImplementation
1635 BuilderImplementation() = delete;
1636 BuilderImplementation(std::unique_ptr<MDModules> mdModules,
1637 SimulationContext * context);
1638 ~BuilderImplementation();
1640 BuilderImplementation &setExtraMdrunOptions(const MdrunOptions &options,
1641 real forceWarningThreshold,
1642 StartingBehavior startingBehavior);
1644 void addDomdec(const DomdecOptions &options);
1646 void addVerletList(int nstlist);
1648 void addReplicaExchange(const ReplicaExchangeParameters ¶ms);
1650 void addMultiSim(gmx_multisim_t* multisim);
1652 void addNonBonded(const char* nbpu_opt);
1654 void addPME(const char* pme_opt_, const char* pme_fft_opt_);
1656 void addBondedTaskAssignment(const char* bonded_opt);
1658 void addHardwareOptions(const gmx_hw_opt_t &hardwareOptions);
1660 void addFilenames(ArrayRef <const t_filenm> filenames);
1662 void addOutputEnvironment(gmx_output_env_t* outputEnvironment);
1664 void addLogFile(t_fileio *logFileHandle);
1666 void addStopHandlerBuilder(std::unique_ptr<StopHandlerBuilder> builder);
1672 // Default parameters copied from runner.h
1673 // \todo Clarify source(s) of default parameters.
1675 const char* nbpu_opt_ = nullptr;
1676 const char* pme_opt_ = nullptr;
1677 const char* pme_fft_opt_ = nullptr;
1678 const char *bonded_opt_ = nullptr;
1680 MdrunOptions mdrunOptions_;
1682 DomdecOptions domdecOptions_;
1684 ReplicaExchangeParameters replicaExchangeParameters_;
1686 //! Command-line override for the duration of a neighbor list with the Verlet scheme.
1689 //! Non-owning multisim communicator handle.
1690 std::unique_ptr<gmx_multisim_t*> multisim_ = nullptr;
1692 //! Print a warning if any force is larger than this (in kJ/mol nm).
1693 real forceWarningThreshold_ = -1;
1695 //! Whether the simulation will start afresh, or restart with/without appending.
1696 StartingBehavior startingBehavior_ = StartingBehavior::NewSimulation;
1698 //! The modules that comprise the functionality of mdrun.
1699 std::unique_ptr<MDModules> mdModules_;
1701 /*! \brief Non-owning pointer to SimulationContext (owned and managed by client)
1704 * \todo Establish robust protocol to make sure resources remain valid.
1705 * SimulationContext will likely be separated into multiple layers for
1706 * different levels of access and different phases of execution. Ref
1707 * https://redmine.gromacs.org/issues/2375
1708 * https://redmine.gromacs.org/issues/2587
1710 SimulationContext* context_ = nullptr;
1712 //! \brief Parallelism information.
1713 gmx_hw_opt_t hardwareOptions_;
1715 //! filename options for simulation.
1716 ArrayRef<const t_filenm> filenames_;
1718 /*! \brief Handle to output environment.
1720 * \todo gmx_output_env_t needs lifetime management.
1722 gmx_output_env_t* outputEnvironment_ = nullptr;
1724 /*! \brief Non-owning handle to MD log file.
1726 * \todo Context should own output facilities for client.
1727 * \todo Improve log file handle management.
1729 * Code managing the FILE* relies on the ability to set it to
1730 * nullptr to check whether the filehandle is valid.
1732 t_fileio* logFileHandle_ = nullptr;
1735 * \brief Builder for simulation stop signal handler.
1737 std::unique_ptr<StopHandlerBuilder> stopHandlerBuilder_ = nullptr;
1740 Mdrunner::BuilderImplementation::BuilderImplementation(std::unique_ptr<MDModules> mdModules,
1741 SimulationContext * context) :
1742 mdModules_(std::move(mdModules)),
1745 GMX_ASSERT(context_, "Bug found. It should not be possible to construct builder without a valid context.");
1748 Mdrunner::BuilderImplementation::~BuilderImplementation() = default;
1750 Mdrunner::BuilderImplementation &
1751 Mdrunner::BuilderImplementation::setExtraMdrunOptions(const MdrunOptions &options,
1752 const real forceWarningThreshold,
1753 const StartingBehavior startingBehavior)
1755 mdrunOptions_ = options;
1756 forceWarningThreshold_ = forceWarningThreshold;
1757 startingBehavior_ = startingBehavior;
1761 void Mdrunner::BuilderImplementation::addDomdec(const DomdecOptions &options)
1763 domdecOptions_ = options;
1766 void Mdrunner::BuilderImplementation::addVerletList(int nstlist)
1771 void Mdrunner::BuilderImplementation::addReplicaExchange(const ReplicaExchangeParameters ¶ms)
1773 replicaExchangeParameters_ = params;
1776 void Mdrunner::BuilderImplementation::addMultiSim(gmx_multisim_t* multisim)
1778 multisim_ = std::make_unique<gmx_multisim_t*>(multisim);
1781 Mdrunner Mdrunner::BuilderImplementation::build()
1783 auto newRunner = Mdrunner(std::move(mdModules_));
1785 GMX_ASSERT(context_, "Bug found. It should not be possible to call build() without a valid context.");
1787 newRunner.mdrunOptions = mdrunOptions_;
1788 newRunner.pforce = forceWarningThreshold_;
1789 newRunner.startingBehavior = startingBehavior_;
1790 newRunner.domdecOptions = domdecOptions_;
1792 // \todo determine an invariant to check or confirm that all gmx_hw_opt_t objects are valid
1793 newRunner.hw_opt = hardwareOptions_;
1795 // No invariant to check. This parameter exists to optionally override other behavior.
1796 newRunner.nstlist_cmdline = nstlist_;
1798 newRunner.replExParams = replicaExchangeParameters_;
1800 newRunner.filenames = filenames_;
1802 GMX_ASSERT(context_->communicationRecord_, "SimulationContext communications not initialized.");
1803 newRunner.cr = context_->communicationRecord_;
1807 // nullptr is a valid value for the multisim handle, so we don't check the pointed-to pointer.
1808 newRunner.ms = *multisim_;
1812 GMX_THROW(gmx::APIError("MdrunnerBuilder::addMultiSim() is required before build()"));
1815 // \todo Clarify ownership and lifetime management for gmx_output_env_t
1816 // \todo Update sanity checking when output environment has clearly specified invariants.
1817 // Initialization and default values for oenv are not well specified in the current version.
1818 if (outputEnvironment_)
1820 newRunner.oenv = outputEnvironment_;
1824 GMX_THROW(gmx::APIError("MdrunnerBuilder::addOutputEnvironment() is required before build()"));
1827 newRunner.logFileHandle = logFileHandle_;
1831 newRunner.nbpu_opt = nbpu_opt_;
1835 GMX_THROW(gmx::APIError("MdrunnerBuilder::addNonBonded() is required before build()"));
1838 if (pme_opt_ && pme_fft_opt_)
1840 newRunner.pme_opt = pme_opt_;
1841 newRunner.pme_fft_opt = pme_fft_opt_;
1845 GMX_THROW(gmx::APIError("MdrunnerBuilder::addElectrostatics() is required before build()"));
1850 newRunner.bonded_opt = bonded_opt_;
1854 GMX_THROW(gmx::APIError("MdrunnerBuilder::addBondedTaskAssignment() is required before build()"));
1857 newRunner.restraintManager_ = std::make_unique<gmx::RestraintManager>();
1859 if (stopHandlerBuilder_)
1861 newRunner.stopHandlerBuilder_ = std::move(stopHandlerBuilder_);
1865 newRunner.stopHandlerBuilder_ = std::make_unique<StopHandlerBuilder>();
1871 void Mdrunner::BuilderImplementation::addNonBonded(const char* nbpu_opt)
1873 nbpu_opt_ = nbpu_opt;
1876 void Mdrunner::BuilderImplementation::addPME(const char* pme_opt,
1877 const char* pme_fft_opt)
1880 pme_fft_opt_ = pme_fft_opt;
1883 void Mdrunner::BuilderImplementation::addBondedTaskAssignment(const char* bonded_opt)
1885 bonded_opt_ = bonded_opt;
1888 void Mdrunner::BuilderImplementation::addHardwareOptions(const gmx_hw_opt_t &hardwareOptions)
1890 hardwareOptions_ = hardwareOptions;
1893 void Mdrunner::BuilderImplementation::addFilenames(ArrayRef<const t_filenm> filenames)
1895 filenames_ = filenames;
1898 void Mdrunner::BuilderImplementation::addOutputEnvironment(gmx_output_env_t* outputEnvironment)
1900 outputEnvironment_ = outputEnvironment;
1903 void Mdrunner::BuilderImplementation::addLogFile(t_fileio *logFileHandle)
1905 logFileHandle_ = logFileHandle;
1908 void Mdrunner::BuilderImplementation::addStopHandlerBuilder(std::unique_ptr<StopHandlerBuilder> builder)
1910 stopHandlerBuilder_ = std::move(builder);
1913 MdrunnerBuilder::MdrunnerBuilder(std::unique_ptr<MDModules> mdModules,
1914 compat::not_null<SimulationContext*> context) :
1915 impl_ {std::make_unique<Mdrunner::BuilderImplementation>(std::move(mdModules), context)}
1919 MdrunnerBuilder::~MdrunnerBuilder() = default;
1921 MdrunnerBuilder &MdrunnerBuilder::addSimulationMethod(const MdrunOptions &options,
1922 real forceWarningThreshold,
1923 const StartingBehavior startingBehavior)
1925 impl_->setExtraMdrunOptions(options, forceWarningThreshold, startingBehavior);
1929 MdrunnerBuilder &MdrunnerBuilder::addDomainDecomposition(const DomdecOptions &options)
1931 impl_->addDomdec(options);
1935 MdrunnerBuilder &MdrunnerBuilder::addNeighborList(int nstlist)
1937 impl_->addVerletList(nstlist);
1941 MdrunnerBuilder &MdrunnerBuilder::addReplicaExchange(const ReplicaExchangeParameters ¶ms)
1943 impl_->addReplicaExchange(params);
1947 MdrunnerBuilder &MdrunnerBuilder::addMultiSim(gmx_multisim_t* multisim)
1949 impl_->addMultiSim(multisim);
1953 MdrunnerBuilder &MdrunnerBuilder::addNonBonded(const char* nbpu_opt)
1955 impl_->addNonBonded(nbpu_opt);
1959 MdrunnerBuilder &MdrunnerBuilder::addElectrostatics(const char* pme_opt,
1960 const char* pme_fft_opt)
1962 // The builder method may become more general in the future, but in this version,
1963 // parameters for PME electrostatics are both required and the only parameters
1965 if (pme_opt && pme_fft_opt)
1967 impl_->addPME(pme_opt, pme_fft_opt);
1971 GMX_THROW(gmx::InvalidInputError("addElectrostatics() arguments must be non-null pointers."));
1976 MdrunnerBuilder &MdrunnerBuilder::addBondedTaskAssignment(const char* bonded_opt)
1978 impl_->addBondedTaskAssignment(bonded_opt);
1982 Mdrunner MdrunnerBuilder::build()
1984 return impl_->build();
1987 MdrunnerBuilder &MdrunnerBuilder::addHardwareOptions(const gmx_hw_opt_t &hardwareOptions)
1989 impl_->addHardwareOptions(hardwareOptions);
1993 MdrunnerBuilder &MdrunnerBuilder::addFilenames(ArrayRef<const t_filenm> filenames)
1995 impl_->addFilenames(filenames);
1999 MdrunnerBuilder &MdrunnerBuilder::addOutputEnvironment(gmx_output_env_t* outputEnvironment)
2001 impl_->addOutputEnvironment(outputEnvironment);
2005 MdrunnerBuilder &MdrunnerBuilder::addLogFile(t_fileio *logFileHandle)
2007 impl_->addLogFile(logFileHandle);
2011 MdrunnerBuilder &MdrunnerBuilder::addStopHandlerBuilder(std::unique_ptr<StopHandlerBuilder> builder)
2013 impl_->addStopHandlerBuilder(std::move(builder));
2017 MdrunnerBuilder::MdrunnerBuilder(MdrunnerBuilder &&) noexcept = default;
2019 MdrunnerBuilder &MdrunnerBuilder::operator=(MdrunnerBuilder &&) noexcept = default;