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43 #include "gromacs/fileio/confio.h"
44 #include "gromacs/fileio/mdoutf.h"
45 #include "gromacs/fileio/trajectory_writing.h"
46 #include "gromacs/fileio/trnio.h"
47 #include "gromacs/fileio/trxio.h"
48 #include "gromacs/fileio/xtcio.h"
49 #include "gromacs/gmxpreprocess/compute_io.h"
50 #include "gromacs/imd/imd.h"
51 #include "gromacs/legacyheaders/bonded-threading.h"
52 #include "gromacs/legacyheaders/calcmu.h"
53 #include "gromacs/legacyheaders/checkpoint.h"
54 #include "gromacs/legacyheaders/constr.h"
55 #include "gromacs/legacyheaders/coulomb.h"
56 #include "gromacs/legacyheaders/disre.h"
57 #include "gromacs/legacyheaders/domdec.h"
58 #include "gromacs/legacyheaders/domdec_network.h"
59 #include "gromacs/legacyheaders/force.h"
60 #include "gromacs/legacyheaders/md_logging.h"
61 #include "gromacs/legacyheaders/md_support.h"
62 #include "gromacs/legacyheaders/mdatoms.h"
63 #include "gromacs/legacyheaders/mdebin.h"
64 #include "gromacs/legacyheaders/mdrun.h"
65 #include "gromacs/legacyheaders/names.h"
66 #include "gromacs/legacyheaders/network.h"
67 #include "gromacs/legacyheaders/nrnb.h"
68 #include "gromacs/legacyheaders/ns.h"
69 #include "gromacs/legacyheaders/orires.h"
70 #include "gromacs/legacyheaders/pme.h"
71 #include "gromacs/legacyheaders/qmmm.h"
72 #include "gromacs/legacyheaders/shellfc.h"
73 #include "gromacs/legacyheaders/sighandler.h"
74 #include "gromacs/legacyheaders/txtdump.h"
75 #include "gromacs/legacyheaders/typedefs.h"
76 #include "gromacs/legacyheaders/update.h"
77 #include "gromacs/legacyheaders/vcm.h"
78 #include "gromacs/legacyheaders/vsite.h"
79 #include "gromacs/legacyheaders/types/iteratedconstraints.h"
80 #include "gromacs/legacyheaders/types/nlistheuristics.h"
81 #include "gromacs/math/vec.h"
82 #include "gromacs/mdlib/nbnxn_cuda/nbnxn_cuda_data_mgmt.h"
83 #include "gromacs/pbcutil/mshift.h"
84 #include "gromacs/pbcutil/pbc.h"
85 #include "gromacs/pulling/pull.h"
86 #include "gromacs/swap/swapcoords.h"
87 #include "gromacs/timing/wallcycle.h"
88 #include "gromacs/timing/walltime_accounting.h"
89 #include "gromacs/topology/mtop_util.h"
90 #include "gromacs/utility/cstringutil.h"
91 #include "gromacs/utility/gmxmpi.h"
92 #include "gromacs/utility/smalloc.h"
96 #include "pme_loadbal.h"
100 #include "corewrap.h"
103 static void reset_all_counters(FILE *fplog, t_commrec *cr,
105 gmx_int64_t *step_rel, t_inputrec *ir,
106 gmx_wallcycle_t wcycle, t_nrnb *nrnb,
107 gmx_walltime_accounting_t walltime_accounting,
108 struct nonbonded_verlet_t *nbv)
110 char sbuf[STEPSTRSIZE];
112 /* Reset all the counters related to performance over the run */
113 md_print_warn(cr, fplog, "step %s: resetting all time and cycle counters\n",
114 gmx_step_str(step, sbuf));
116 nbnxn_cuda_reset_timings(nbv);
118 wallcycle_stop(wcycle, ewcRUN);
119 wallcycle_reset_all(wcycle);
120 if (DOMAINDECOMP(cr))
122 reset_dd_statistics_counters(cr->dd);
125 ir->init_step += *step_rel;
126 ir->nsteps -= *step_rel;
128 wallcycle_start(wcycle, ewcRUN);
129 walltime_accounting_start(walltime_accounting);
130 print_date_and_time(fplog, cr->nodeid, "Restarted time", gmx_gettime());
133 double do_md(FILE *fplog, t_commrec *cr, int nfile, const t_filenm fnm[],
134 const output_env_t oenv, gmx_bool bVerbose, gmx_bool bCompact,
136 gmx_vsite_t *vsite, gmx_constr_t constr,
137 int stepout, t_inputrec *ir,
138 gmx_mtop_t *top_global,
140 t_state *state_global,
142 t_nrnb *nrnb, gmx_wallcycle_t wcycle,
143 gmx_edsam_t ed, t_forcerec *fr,
144 int repl_ex_nst, int repl_ex_nex, int repl_ex_seed, gmx_membed_t membed,
145 real cpt_period, real max_hours,
146 const char gmx_unused *deviceOptions,
149 gmx_walltime_accounting_t walltime_accounting)
151 gmx_mdoutf_t outf = NULL;
152 gmx_int64_t step, step_rel;
154 double t, t0, lam0[efptNR];
155 gmx_bool bGStatEveryStep, bGStat, bCalcVir, bCalcEner;
156 gmx_bool bNS, bNStList, bSimAnn, bStopCM, bRerunMD, bNotLastFrame = FALSE,
157 bFirstStep, bStateFromCP, bStateFromTPX, bInitStep, bLastStep,
158 bBornRadii, bStartingFromCpt;
159 gmx_bool bDoDHDL = FALSE, bDoFEP = FALSE, bDoExpanded = FALSE;
160 gmx_bool do_ene, do_log, do_verbose, bRerunWarnNoV = TRUE,
161 bForceUpdate = FALSE, bCPT;
162 gmx_bool bMasterState;
163 int force_flags, cglo_flags;
164 tensor force_vir, shake_vir, total_vir, tmp_vir, pres;
169 t_state *bufstate = NULL;
173 gmx_repl_ex_t repl_ex = NULL;
176 t_mdebin *mdebin = NULL;
177 t_state *state = NULL;
178 rvec *f_global = NULL;
179 gmx_enerdata_t *enerd;
181 gmx_global_stat_t gstat;
182 gmx_update_t upd = NULL;
183 t_graph *graph = NULL;
185 gmx_groups_t *groups;
186 gmx_ekindata_t *ekind, *ekind_save;
187 gmx_shellfc_t shellfc;
188 int count, nconverged = 0;
190 gmx_bool bConverged = TRUE, bSumEkinhOld, bDoReplEx, bExchanged, bNeedRepartition;
191 gmx_bool bResetCountersHalfMaxH = FALSE;
192 gmx_bool bVV, bIterativeCase, bFirstIterate, bTemp, bPres, bTrotter;
193 gmx_bool bUpdateDoLR;
197 real veta_save, scalevir, tracevir;
203 real saved_conserved_quantity = 0;
207 char sbuf[STEPSTRSIZE], sbuf2[STEPSTRSIZE];
208 int handled_stop_condition = gmx_stop_cond_none; /* compare to get_stop_condition*/
209 gmx_iterate_t iterate;
210 gmx_int64_t multisim_nsteps = -1; /* number of steps to do before first multisim
211 simulation stops. If equal to zero, don't
212 communicate any more between multisims.*/
213 /* PME load balancing data for GPU kernels */
214 pme_load_balancing_t pme_loadbal = NULL;
216 gmx_bool bPMETuneTry = FALSE, bPMETuneRunning = FALSE;
219 gmx_bool bIMDstep = FALSE;
222 /* Temporary addition for FAHCORE checkpointing */
226 /* Check for special mdrun options */
227 bRerunMD = (Flags & MD_RERUN);
228 if (Flags & MD_RESETCOUNTERSHALFWAY)
232 /* Signal to reset the counters half the simulation steps. */
233 wcycle_set_reset_counters(wcycle, ir->nsteps/2);
235 /* Signal to reset the counters halfway the simulation time. */
236 bResetCountersHalfMaxH = (max_hours > 0);
239 /* md-vv uses averaged full step velocities for T-control
240 md-vv-avek uses averaged half step velocities for T-control (but full step ekin for P control)
241 md uses averaged half step kinetic energies to determine temperature unless defined otherwise by GMX_EKIN_AVE_VEL; */
243 if (bVV) /* to store the initial velocities while computing virial */
245 snew(cbuf, top_global->natoms);
247 /* all the iteratative cases - only if there are constraints */
248 bIterativeCase = ((IR_NPH_TROTTER(ir) || IR_NPT_TROTTER(ir)) && (constr) && (!bRerunMD));
249 gmx_iterate_init(&iterate, FALSE); /* The default value of iterate->bIterationActive is set to
250 false in this step. The correct value, true or false,
251 is set at each step, as it depends on the frequency of temperature
252 and pressure control.*/
253 bTrotter = (bVV && (IR_NPT_TROTTER(ir) || IR_NPH_TROTTER(ir) || IR_NVT_TROTTER(ir)));
257 /* Since we don't know if the frames read are related in any way,
258 * rebuild the neighborlist at every step.
261 ir->nstcalcenergy = 1;
265 check_ir_old_tpx_versions(cr, fplog, ir, top_global);
267 nstglobalcomm = check_nstglobalcomm(fplog, cr, nstglobalcomm, ir);
268 bGStatEveryStep = (nstglobalcomm == 1);
270 if (!bGStatEveryStep && ir->nstlist == -1 && fplog != NULL)
273 "To reduce the energy communication with nstlist = -1\n"
274 "the neighbor list validity should not be checked at every step,\n"
275 "this means that exact integration is not guaranteed.\n"
276 "The neighbor list validity is checked after:\n"
277 " <n.list life time> - 2*std.dev.(n.list life time) steps.\n"
278 "In most cases this will result in exact integration.\n"
279 "This reduces the energy communication by a factor of 2 to 3.\n"
280 "If you want less energy communication, set nstlist > 3.\n\n");
285 ir->nstxout_compressed = 0;
287 groups = &top_global->groups;
290 init_md(fplog, cr, ir, oenv, &t, &t0, state_global->lambda,
291 &(state_global->fep_state), lam0,
292 nrnb, top_global, &upd,
293 nfile, fnm, &outf, &mdebin,
294 force_vir, shake_vir, mu_tot, &bSimAnn, &vcm, Flags, wcycle);
296 clear_mat(total_vir);
298 /* Energy terms and groups */
300 init_enerdata(top_global->groups.grps[egcENER].nr, ir->fepvals->n_lambda,
302 if (DOMAINDECOMP(cr))
308 snew(f, top_global->natoms);
311 /* Kinetic energy data */
313 init_ekindata(fplog, top_global, &(ir->opts), ekind);
314 /* needed for iteration of constraints */
316 init_ekindata(fplog, top_global, &(ir->opts), ekind_save);
317 /* Copy the cos acceleration to the groups struct */
318 ekind->cosacc.cos_accel = ir->cos_accel;
320 gstat = global_stat_init(ir);
323 /* Check for polarizable models and flexible constraints */
324 shellfc = init_shell_flexcon(fplog,
325 top_global, n_flexible_constraints(constr),
326 (ir->bContinuation ||
327 (DOMAINDECOMP(cr) && !MASTER(cr))) ?
328 NULL : state_global->x);
329 if (shellfc && ir->nstcalcenergy != 1)
331 gmx_fatal(FARGS, "You have nstcalcenergy set to a value (%d) that is different from 1.\nThis is not supported in combinations with shell particles.\nPlease make a new tpr file.", ir->nstcalcenergy);
333 if (shellfc && DOMAINDECOMP(cr))
335 gmx_fatal(FARGS, "Shell particles are not implemented with domain decomposition, use a single rank");
337 if (shellfc && ir->eI == eiNM)
339 /* Currently shells don't work with Normal Modes */
340 gmx_fatal(FARGS, "Normal Mode analysis is not supported with shells.\nIf you'd like to help with adding support, we have an open discussion at http://redmine.gromacs.org/issues/879\n");
343 if (vsite && ir->eI == eiNM)
345 /* Currently virtual sites don't work with Normal Modes */
346 gmx_fatal(FARGS, "Normal Mode analysis is not supported with virtual sites.\nIf you'd like to help with adding support, we have an open discussion at http://redmine.gromacs.org/issues/879\n");
351 tMPI_Thread_mutex_lock(&deform_init_box_mutex);
352 set_deform_reference_box(upd,
353 deform_init_init_step_tpx,
354 deform_init_box_tpx);
355 tMPI_Thread_mutex_unlock(&deform_init_box_mutex);
359 double io = compute_io(ir, top_global->natoms, groups, mdebin->ebin->nener, 1);
360 if ((io > 2000) && MASTER(cr))
363 "\nWARNING: This run will generate roughly %.0f Mb of data\n\n",
368 if (DOMAINDECOMP(cr))
370 top = dd_init_local_top(top_global);
373 dd_init_local_state(cr->dd, state_global, state);
375 if (DDMASTER(cr->dd) && ir->nstfout)
377 snew(f_global, state_global->natoms);
382 top = gmx_mtop_generate_local_top(top_global, ir);
384 forcerec_set_excl_load(fr, top);
386 state = serial_init_local_state(state_global);
389 atoms2md(top_global, ir, 0, NULL, top_global->natoms, mdatoms);
393 set_vsite_top(vsite, top, mdatoms, cr);
396 if (ir->ePBC != epbcNONE && !fr->bMolPBC)
398 graph = mk_graph(fplog, &(top->idef), 0, top_global->natoms, FALSE, FALSE);
403 make_local_shells(cr, mdatoms, shellfc);
406 setup_bonded_threading(fr, &top->idef);
409 /* Set up interactive MD (IMD) */
410 init_IMD(ir, cr, top_global, fplog, ir->nstcalcenergy, state_global->x,
411 nfile, fnm, oenv, imdport, Flags);
413 if (DOMAINDECOMP(cr))
415 /* Distribute the charge groups over the nodes from the master node */
416 dd_partition_system(fplog, ir->init_step, cr, TRUE, 1,
417 state_global, top_global, ir,
418 state, &f, mdatoms, top, fr,
419 vsite, shellfc, constr,
420 nrnb, wcycle, FALSE);
424 update_mdatoms(mdatoms, state->lambda[efptMASS]);
426 if (opt2bSet("-cpi", nfile, fnm))
428 bStateFromCP = gmx_fexist_master(opt2fn_master("-cpi", nfile, fnm, cr), cr);
432 bStateFromCP = FALSE;
437 init_expanded_ensemble(bStateFromCP, ir, &state->dfhist);
444 /* Update mdebin with energy history if appending to output files */
445 if (Flags & MD_APPENDFILES)
447 restore_energyhistory_from_state(mdebin, &state_global->enerhist);
451 /* We might have read an energy history from checkpoint,
452 * free the allocated memory and reset the counts.
454 done_energyhistory(&state_global->enerhist);
455 init_energyhistory(&state_global->enerhist);
458 /* Set the initial energy history in state by updating once */
459 update_energyhistory(&state_global->enerhist, mdebin);
462 /* Initialize constraints */
463 if (constr && !DOMAINDECOMP(cr))
465 set_constraints(constr, top, ir, mdatoms, cr);
468 if (repl_ex_nst > 0 && MASTER(cr))
470 repl_ex = init_replica_exchange(fplog, cr->ms, state_global, ir,
471 repl_ex_nst, repl_ex_nex, repl_ex_seed);
474 /* PME tuning is only supported with GPUs or PME nodes and not with rerun.
475 * PME tuning is not supported with PME only for LJ and not for Coulomb.
477 if ((Flags & MD_TUNEPME) &&
478 EEL_PME(fr->eeltype) &&
479 ( use_GPU(fr->nbv) || !(cr->duty & DUTY_PME)) &&
482 pme_loadbal_init(&pme_loadbal, ir, state->box, fr->ic, fr->pmedata);
484 if (cr->duty & DUTY_PME)
486 /* Start tuning right away, as we can't measure the load */
487 bPMETuneRunning = TRUE;
491 /* Separate PME nodes, we can measure the PP/PME load balance */
496 if (!ir->bContinuation && !bRerunMD)
498 if (mdatoms->cFREEZE && (state->flags & (1<<estV)))
500 /* Set the velocities of frozen particles to zero */
501 for (i = 0; i < mdatoms->homenr; i++)
503 for (m = 0; m < DIM; m++)
505 if (ir->opts.nFreeze[mdatoms->cFREEZE[i]][m])
515 /* Constrain the initial coordinates and velocities */
516 do_constrain_first(fplog, constr, ir, mdatoms, state,
521 /* Construct the virtual sites for the initial configuration */
522 construct_vsites(vsite, state->x, ir->delta_t, NULL,
523 top->idef.iparams, top->idef.il,
524 fr->ePBC, fr->bMolPBC, cr, state->box);
530 /* set free energy calculation frequency as the minimum
531 greatest common denominator of nstdhdl, nstexpanded, and repl_ex_nst*/
532 nstfep = ir->fepvals->nstdhdl;
535 nstfep = gmx_greatest_common_divisor(ir->fepvals->nstdhdl, nstfep);
539 nstfep = gmx_greatest_common_divisor(repl_ex_nst, nstfep);
542 /* I'm assuming we need global communication the first time! MRS */
543 cglo_flags = (CGLO_TEMPERATURE | CGLO_GSTAT
544 | ((ir->comm_mode != ecmNO) ? CGLO_STOPCM : 0)
545 | (bVV ? CGLO_PRESSURE : 0)
546 | (bVV ? CGLO_CONSTRAINT : 0)
547 | (bRerunMD ? CGLO_RERUNMD : 0)
548 | ((Flags & MD_READ_EKIN) ? CGLO_READEKIN : 0));
550 bSumEkinhOld = FALSE;
551 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
552 NULL, enerd, force_vir, shake_vir, total_vir, pres, mu_tot,
553 constr, NULL, FALSE, state->box,
554 top_global, &bSumEkinhOld, cglo_flags);
555 if (ir->eI == eiVVAK)
557 /* a second call to get the half step temperature initialized as well */
558 /* we do the same call as above, but turn the pressure off -- internally to
559 compute_globals, this is recognized as a velocity verlet half-step
560 kinetic energy calculation. This minimized excess variables, but
561 perhaps loses some logic?*/
563 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
564 NULL, enerd, force_vir, shake_vir, total_vir, pres, mu_tot,
565 constr, NULL, FALSE, state->box,
566 top_global, &bSumEkinhOld,
567 cglo_flags &~(CGLO_STOPCM | CGLO_PRESSURE));
570 /* Calculate the initial half step temperature, and save the ekinh_old */
571 if (!(Flags & MD_STARTFROMCPT))
573 for (i = 0; (i < ir->opts.ngtc); i++)
575 copy_mat(ekind->tcstat[i].ekinh, ekind->tcstat[i].ekinh_old);
580 enerd->term[F_TEMP] *= 2; /* result of averages being done over previous and current step,
581 and there is no previous step */
584 /* if using an iterative algorithm, we need to create a working directory for the state. */
587 bufstate = init_bufstate(state);
590 /* need to make an initiation call to get the Trotter variables set, as well as other constants for non-trotter
591 temperature control */
592 trotter_seq = init_npt_vars(ir, state, &MassQ, bTrotter);
596 if (constr && !ir->bContinuation && ir->eConstrAlg == econtLINCS)
599 "RMS relative constraint deviation after constraining: %.2e\n",
600 constr_rmsd(constr, FALSE));
602 if (EI_STATE_VELOCITY(ir->eI))
604 fprintf(fplog, "Initial temperature: %g K\n", enerd->term[F_TEMP]);
608 fprintf(stderr, "starting md rerun '%s', reading coordinates from"
609 " input trajectory '%s'\n\n",
610 *(top_global->name), opt2fn("-rerun", nfile, fnm));
613 fprintf(stderr, "Calculated time to finish depends on nsteps from "
614 "run input file,\nwhich may not correspond to the time "
615 "needed to process input trajectory.\n\n");
621 fprintf(stderr, "starting mdrun '%s'\n",
622 *(top_global->name));
625 sprintf(tbuf, "%8.1f", (ir->init_step+ir->nsteps)*ir->delta_t);
629 sprintf(tbuf, "%s", "infinite");
631 if (ir->init_step > 0)
633 fprintf(stderr, "%s steps, %s ps (continuing from step %s, %8.1f ps).\n",
634 gmx_step_str(ir->init_step+ir->nsteps, sbuf), tbuf,
635 gmx_step_str(ir->init_step, sbuf2),
636 ir->init_step*ir->delta_t);
640 fprintf(stderr, "%s steps, %s ps.\n",
641 gmx_step_str(ir->nsteps, sbuf), tbuf);
644 fprintf(fplog, "\n");
647 walltime_accounting_start(walltime_accounting);
648 wallcycle_start(wcycle, ewcRUN);
649 print_start(fplog, cr, walltime_accounting, "mdrun");
651 /* safest point to do file checkpointing is here. More general point would be immediately before integrator call */
653 chkpt_ret = fcCheckPointParallel( cr->nodeid,
657 gmx_fatal( 3, __FILE__, __LINE__, "Checkpoint error on step %d\n", 0 );
662 /***********************************************************
666 ************************************************************/
668 /* if rerunMD then read coordinates and velocities from input trajectory */
671 if (getenv("GMX_FORCE_UPDATE"))
679 bNotLastFrame = read_first_frame(oenv, &status,
680 opt2fn("-rerun", nfile, fnm),
681 &rerun_fr, TRX_NEED_X | TRX_READ_V);
682 if (rerun_fr.natoms != top_global->natoms)
685 "Number of atoms in trajectory (%d) does not match the "
686 "run input file (%d)\n",
687 rerun_fr.natoms, top_global->natoms);
689 if (ir->ePBC != epbcNONE)
693 gmx_fatal(FARGS, "Rerun trajectory frame step %d time %f does not contain a box, while pbc is used", rerun_fr.step, rerun_fr.time);
695 if (max_cutoff2(ir->ePBC, rerun_fr.box) < sqr(fr->rlistlong))
697 gmx_fatal(FARGS, "Rerun trajectory frame step %d time %f has too small box dimensions", rerun_fr.step, rerun_fr.time);
704 rerun_parallel_comm(cr, &rerun_fr, &bNotLastFrame);
707 if (ir->ePBC != epbcNONE)
709 /* Set the shift vectors.
710 * Necessary here when have a static box different from the tpr box.
712 calc_shifts(rerun_fr.box, fr->shift_vec);
716 /* loop over MD steps or if rerunMD to end of input trajectory */
718 /* Skip the first Nose-Hoover integration when we get the state from tpx */
719 bStateFromTPX = !bStateFromCP;
720 bInitStep = bFirstStep && (bStateFromTPX || bVV);
721 bStartingFromCpt = (Flags & MD_STARTFROMCPT) && bInitStep;
722 bSumEkinhOld = FALSE;
724 bNeedRepartition = FALSE;
726 init_global_signals(&gs, cr, ir, repl_ex_nst);
728 step = ir->init_step;
731 init_nlistheuristics(&nlh, bGStatEveryStep, step);
733 if (MULTISIM(cr) && (repl_ex_nst <= 0 ))
735 /* check how many steps are left in other sims */
736 multisim_nsteps = get_multisim_nsteps(cr, ir->nsteps);
740 /* and stop now if we should */
741 bLastStep = (bRerunMD || (ir->nsteps >= 0 && step_rel > ir->nsteps) ||
742 ((multisim_nsteps >= 0) && (step_rel >= multisim_nsteps )));
743 while (!bLastStep || (bRerunMD && bNotLastFrame))
746 wallcycle_start(wcycle, ewcSTEP);
752 step = rerun_fr.step;
753 step_rel = step - ir->init_step;
766 bLastStep = (step_rel == ir->nsteps);
767 t = t0 + step*ir->delta_t;
770 if (ir->efep != efepNO || ir->bSimTemp)
772 /* find and set the current lambdas. If rerunning, we either read in a state, or a lambda value,
773 requiring different logic. */
775 set_current_lambdas(step, ir->fepvals, bRerunMD, &rerun_fr, state_global, state, lam0);
776 bDoDHDL = do_per_step(step, ir->fepvals->nstdhdl);
777 bDoFEP = (do_per_step(step, nstfep) && (ir->efep != efepNO));
778 bDoExpanded = (do_per_step(step, ir->expandedvals->nstexpanded)
779 && (ir->bExpanded) && (step > 0) && (!bStartingFromCpt));
782 bDoReplEx = ((repl_ex_nst > 0) && (step > 0) && !bLastStep &&
783 do_per_step(step, repl_ex_nst));
787 update_annealing_target_temp(&(ir->opts), t);
792 if (!DOMAINDECOMP(cr) || MASTER(cr))
794 for (i = 0; i < state_global->natoms; i++)
796 copy_rvec(rerun_fr.x[i], state_global->x[i]);
800 for (i = 0; i < state_global->natoms; i++)
802 copy_rvec(rerun_fr.v[i], state_global->v[i]);
807 for (i = 0; i < state_global->natoms; i++)
809 clear_rvec(state_global->v[i]);
813 fprintf(stderr, "\nWARNING: Some frames do not contain velocities.\n"
814 " Ekin, temperature and pressure are incorrect,\n"
815 " the virial will be incorrect when constraints are present.\n"
817 bRerunWarnNoV = FALSE;
821 copy_mat(rerun_fr.box, state_global->box);
822 copy_mat(state_global->box, state->box);
824 if (vsite && (Flags & MD_RERUN_VSITE))
826 if (DOMAINDECOMP(cr))
828 gmx_fatal(FARGS, "Vsite recalculation with -rerun is not implemented with domain decomposition, use a single rank");
832 /* Following is necessary because the graph may get out of sync
833 * with the coordinates if we only have every N'th coordinate set
835 mk_mshift(fplog, graph, fr->ePBC, state->box, state->x);
836 shift_self(graph, state->box, state->x);
838 construct_vsites(vsite, state->x, ir->delta_t, state->v,
839 top->idef.iparams, top->idef.il,
840 fr->ePBC, fr->bMolPBC, cr, state->box);
843 unshift_self(graph, state->box, state->x);
848 /* Stop Center of Mass motion */
849 bStopCM = (ir->comm_mode != ecmNO && do_per_step(step, ir->nstcomm));
853 /* for rerun MD always do Neighbour Searching */
854 bNS = (bFirstStep || ir->nstlist != 0);
859 /* Determine whether or not to do Neighbour Searching and LR */
860 bNStList = (ir->nstlist > 0 && step % ir->nstlist == 0);
862 bNS = (bFirstStep || bExchanged || bNeedRepartition || bNStList || bDoFEP ||
863 (ir->nstlist == -1 && nlh.nabnsb > 0));
865 if (bNS && ir->nstlist == -1)
867 set_nlistheuristics(&nlh, bFirstStep || bExchanged || bNeedRepartition || bDoFEP, step);
871 /* check whether we should stop because another simulation has
875 if ( (multisim_nsteps >= 0) && (step_rel >= multisim_nsteps) &&
876 (multisim_nsteps != ir->nsteps) )
883 "Stopping simulation %d because another one has finished\n",
887 gs.sig[eglsCHKPT] = 1;
892 /* < 0 means stop at next step, > 0 means stop at next NS step */
893 if ( (gs.set[eglsSTOPCOND] < 0) ||
894 ( (gs.set[eglsSTOPCOND] > 0) && (bNStList || ir->nstlist == 0) ) )
899 /* Determine whether or not to update the Born radii if doing GB */
900 bBornRadii = bFirstStep;
901 if (ir->implicit_solvent && (step % ir->nstgbradii == 0))
906 do_log = do_per_step(step, ir->nstlog) || bFirstStep || bLastStep;
907 do_verbose = bVerbose &&
908 (step % stepout == 0 || bFirstStep || bLastStep);
910 if (bNS && !(bFirstStep && ir->bContinuation && !bRerunMD))
918 bMasterState = FALSE;
919 /* Correct the new box if it is too skewed */
920 if (DYNAMIC_BOX(*ir))
922 if (correct_box(fplog, step, state->box, graph))
927 if (DOMAINDECOMP(cr) && bMasterState)
929 dd_collect_state(cr->dd, state, state_global);
933 if (DOMAINDECOMP(cr))
935 /* Repartition the domain decomposition */
936 wallcycle_start(wcycle, ewcDOMDEC);
937 dd_partition_system(fplog, step, cr,
938 bMasterState, nstglobalcomm,
939 state_global, top_global, ir,
940 state, &f, mdatoms, top, fr,
941 vsite, shellfc, constr,
943 do_verbose && !bPMETuneRunning);
944 wallcycle_stop(wcycle, ewcDOMDEC);
945 /* If using an iterative integrator, reallocate space to match the decomposition */
949 if (MASTER(cr) && do_log)
951 print_ebin_header(fplog, step, t, state->lambda[efptFEP]); /* can we improve the information printed here? */
954 if (ir->efep != efepNO)
956 update_mdatoms(mdatoms, state->lambda[efptMASS]);
959 if ((bRerunMD && rerun_fr.bV) || bExchanged)
962 /* We need the kinetic energy at minus the half step for determining
963 * the full step kinetic energy and possibly for T-coupling.*/
964 /* This may not be quite working correctly yet . . . . */
965 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
966 wcycle, enerd, NULL, NULL, NULL, NULL, mu_tot,
967 constr, NULL, FALSE, state->box,
968 top_global, &bSumEkinhOld,
969 CGLO_RERUNMD | CGLO_GSTAT | CGLO_TEMPERATURE);
971 clear_mat(force_vir);
973 /* We write a checkpoint at this MD step when:
974 * either at an NS step when we signalled through gs,
975 * or at the last step (but not when we do not want confout),
976 * but never at the first step or with rerun.
978 bCPT = (((gs.set[eglsCHKPT] && (bNS || ir->nstlist == 0)) ||
979 (bLastStep && (Flags & MD_CONFOUT))) &&
980 step > ir->init_step && !bRerunMD);
983 gs.set[eglsCHKPT] = 0;
986 /* Determine the energy and pressure:
987 * at nstcalcenergy steps and at energy output steps (set below).
989 if (EI_VV(ir->eI) && (!bInitStep))
991 /* for vv, the first half of the integration actually corresponds
992 to the previous step. bCalcEner is only required to be evaluated on the 'next' step,
993 but the virial needs to be calculated on both the current step and the 'next' step. Future
994 reorganization may be able to get rid of one of the bCalcVir=TRUE steps. */
996 bCalcEner = do_per_step(step-1, ir->nstcalcenergy);
997 bCalcVir = bCalcEner ||
998 (ir->epc != epcNO && (do_per_step(step, ir->nstpcouple) || do_per_step(step-1, ir->nstpcouple)));
1002 bCalcEner = do_per_step(step, ir->nstcalcenergy);
1003 bCalcVir = bCalcEner ||
1004 (ir->epc != epcNO && do_per_step(step, ir->nstpcouple));
1007 /* Do we need global communication ? */
1008 bGStat = (bCalcVir || bCalcEner || bStopCM ||
1009 do_per_step(step, nstglobalcomm) || (bVV && IR_NVT_TROTTER(ir) && do_per_step(step-1, nstglobalcomm)) ||
1010 (ir->nstlist == -1 && !bRerunMD && step >= nlh.step_nscheck));
1012 do_ene = (do_per_step(step, ir->nstenergy) || bLastStep);
1014 if (do_ene || do_log || bDoReplEx)
1021 /* these CGLO_ options remain the same throughout the iteration */
1022 cglo_flags = ((bRerunMD ? CGLO_RERUNMD : 0) |
1023 (bGStat ? CGLO_GSTAT : 0)
1026 force_flags = (GMX_FORCE_STATECHANGED |
1027 ((DYNAMIC_BOX(*ir) || bRerunMD) ? GMX_FORCE_DYNAMICBOX : 0) |
1028 GMX_FORCE_ALLFORCES |
1030 (bCalcVir ? GMX_FORCE_VIRIAL : 0) |
1031 (bCalcEner ? GMX_FORCE_ENERGY : 0) |
1032 (bDoFEP ? GMX_FORCE_DHDL : 0)
1037 if (do_per_step(step, ir->nstcalclr))
1039 force_flags |= GMX_FORCE_DO_LR;
1045 /* Now is the time to relax the shells */
1046 count = relax_shell_flexcon(fplog, cr, bVerbose, step,
1047 ir, bNS, force_flags,
1050 state, f, force_vir, mdatoms,
1051 nrnb, wcycle, graph, groups,
1052 shellfc, fr, bBornRadii, t, mu_tot,
1054 mdoutf_get_fp_field(outf));
1064 /* The coordinates (x) are shifted (to get whole molecules)
1066 * This is parallellized as well, and does communication too.
1067 * Check comments in sim_util.c
1069 do_force(fplog, cr, ir, step, nrnb, wcycle, top, groups,
1070 state->box, state->x, &state->hist,
1071 f, force_vir, mdatoms, enerd, fcd,
1072 state->lambda, graph,
1073 fr, vsite, mu_tot, t, mdoutf_get_fp_field(outf), ed, bBornRadii,
1074 (bNS ? GMX_FORCE_NS : 0) | force_flags);
1077 if (bVV && !bStartingFromCpt && !bRerunMD)
1078 /* ############### START FIRST UPDATE HALF-STEP FOR VV METHODS############### */
1080 wallcycle_start(wcycle, ewcUPDATE);
1081 if (ir->eI == eiVV && bInitStep)
1083 /* if using velocity verlet with full time step Ekin,
1084 * take the first half step only to compute the
1085 * virial for the first step. From there,
1086 * revert back to the initial coordinates
1087 * so that the input is actually the initial step.
1089 copy_rvecn(state->v, cbuf, 0, state->natoms); /* should make this better for parallelizing? */
1093 /* this is for NHC in the Ekin(t+dt/2) version of vv */
1094 trotter_update(ir, step, ekind, enerd, state, total_vir, mdatoms, &MassQ, trotter_seq, ettTSEQ1);
1097 /* If we are using twin-range interactions where the long-range component
1098 * is only evaluated every nstcalclr>1 steps, we should do a special update
1099 * step to combine the long-range forces on these steps.
1100 * For nstcalclr=1 this is not done, since the forces would have been added
1101 * directly to the short-range forces already.
1103 * TODO Remove various aspects of VV+twin-range in master
1104 * branch, because VV integrators did not ever support
1105 * twin-range multiple time stepping with constraints.
1107 bUpdateDoLR = (fr->bTwinRange && do_per_step(step, ir->nstcalclr));
1109 update_coords(fplog, step, ir, mdatoms, state, fr->bMolPBC,
1110 f, bUpdateDoLR, fr->f_twin, bCalcVir ? &fr->vir_twin_constr : NULL, fcd,
1111 ekind, M, upd, bInitStep, etrtVELOCITY1,
1112 cr, nrnb, constr, &top->idef);
1114 if (bIterativeCase && do_per_step(step-1, ir->nstpcouple) && !bInitStep)
1116 gmx_iterate_init(&iterate, TRUE);
1118 /* for iterations, we save these vectors, as we will be self-consistently iterating
1121 /*#### UPDATE EXTENDED VARIABLES IN TROTTER FORMULATION */
1123 /* save the state */
1124 if (iterate.bIterationActive)
1126 copy_coupling_state(state, bufstate, ekind, ekind_save, &(ir->opts));
1129 bFirstIterate = TRUE;
1130 while (bFirstIterate || iterate.bIterationActive)
1132 if (iterate.bIterationActive)
1134 copy_coupling_state(bufstate, state, ekind_save, ekind, &(ir->opts));
1135 if (bFirstIterate && bTrotter)
1137 /* The first time through, we need a decent first estimate
1138 of veta(t+dt) to compute the constraints. Do
1139 this by computing the box volume part of the
1140 trotter integration at this time. Nothing else
1141 should be changed by this routine here. If
1142 !(first time), we start with the previous value
1145 veta_save = state->veta;
1146 trotter_update(ir, step, ekind, enerd, state, total_vir, mdatoms, &MassQ, trotter_seq, ettTSEQ0);
1147 vetanew = state->veta;
1148 state->veta = veta_save;
1152 if (!bRerunMD || rerun_fr.bV || bForceUpdate) /* Why is rerun_fr.bV here? Unclear. */
1154 wallcycle_stop(wcycle, ewcUPDATE);
1155 update_constraints(fplog, step, NULL, ir, ekind, mdatoms,
1156 state, fr->bMolPBC, graph, f,
1157 &top->idef, shake_vir,
1158 cr, nrnb, wcycle, upd, constr,
1159 TRUE, bCalcVir, vetanew);
1160 wallcycle_start(wcycle, ewcUPDATE);
1162 if (bCalcVir && bUpdateDoLR && ir->nstcalclr > 1)
1164 /* Correct the virial for multiple time stepping */
1165 m_sub(shake_vir, fr->vir_twin_constr, shake_vir);
1170 /* Need to unshift here if a do_force has been
1171 called in the previous step */
1172 unshift_self(graph, state->box, state->x);
1175 /* if VV, compute the pressure and constraints */
1176 /* For VV2, we strictly only need this if using pressure
1177 * control, but we really would like to have accurate pressures
1179 * Think about ways around this in the future?
1180 * For now, keep this choice in comments.
1182 /*bPres = (ir->eI==eiVV || IR_NPT_TROTTER(ir)); */
1183 /*bTemp = ((ir->eI==eiVV &&(!bInitStep)) || (ir->eI==eiVVAK && IR_NPT_TROTTER(ir)));*/
1185 bTemp = ((ir->eI == eiVV && (!bInitStep)) || (ir->eI == eiVVAK));
1186 if (bCalcEner && ir->eI == eiVVAK) /*MRS: 7/9/2010 -- this still doesn't fix it?*/
1188 bSumEkinhOld = TRUE;
1190 /* for vv, the first half of the integration actually corresponds to the previous step.
1191 So we need information from the last step in the first half of the integration */
1192 if (bGStat || do_per_step(step-1, nstglobalcomm))
1194 wallcycle_stop(wcycle, ewcUPDATE);
1195 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
1196 wcycle, enerd, force_vir, shake_vir, total_vir, pres, mu_tot,
1197 constr, NULL, FALSE, state->box,
1198 top_global, &bSumEkinhOld,
1201 | (bTemp ? CGLO_TEMPERATURE : 0)
1202 | (bPres ? CGLO_PRESSURE : 0)
1203 | (bPres ? CGLO_CONSTRAINT : 0)
1204 | ((iterate.bIterationActive) ? CGLO_ITERATE : 0)
1205 | (bFirstIterate ? CGLO_FIRSTITERATE : 0)
1208 /* explanation of above:
1209 a) We compute Ekin at the full time step
1210 if 1) we are using the AveVel Ekin, and it's not the
1211 initial step, or 2) if we are using AveEkin, but need the full
1212 time step kinetic energy for the pressure (always true now, since we want accurate statistics).
1213 b) If we are using EkinAveEkin for the kinetic energy for the temperature control, we still feed in
1214 EkinAveVel because it's needed for the pressure */
1215 wallcycle_start(wcycle, ewcUPDATE);
1217 /* temperature scaling and pressure scaling to produce the extended variables at t+dt */
1222 m_add(force_vir, shake_vir, total_vir); /* we need the un-dispersion corrected total vir here */
1223 trotter_update(ir, step, ekind, enerd, state, total_vir, mdatoms, &MassQ, trotter_seq, ettTSEQ2);
1229 wallcycle_stop(wcycle, ewcUPDATE);
1230 /* We need the kinetic energy at minus the half step for determining
1231 * the full step kinetic energy and possibly for T-coupling.*/
1232 /* This may not be quite working correctly yet . . . . */
1233 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
1234 wcycle, enerd, NULL, NULL, NULL, NULL, mu_tot,
1235 constr, NULL, FALSE, state->box,
1236 top_global, &bSumEkinhOld,
1237 CGLO_RERUNMD | CGLO_GSTAT | CGLO_TEMPERATURE);
1238 wallcycle_start(wcycle, ewcUPDATE);
1243 if (iterate.bIterationActive &&
1244 done_iterating(cr, fplog, step, &iterate, bFirstIterate,
1245 state->veta, &vetanew))
1249 bFirstIterate = FALSE;
1252 if (bTrotter && !bInitStep)
1254 copy_mat(shake_vir, state->svir_prev);
1255 copy_mat(force_vir, state->fvir_prev);
1256 if (IR_NVT_TROTTER(ir) && ir->eI == eiVV)
1258 /* update temperature and kinetic energy now that step is over - this is the v(t+dt) point */
1259 enerd->term[F_TEMP] = sum_ekin(&(ir->opts), ekind, NULL, (ir->eI == eiVV), FALSE);
1260 enerd->term[F_EKIN] = trace(ekind->ekin);
1263 /* if it's the initial step, we performed this first step just to get the constraint virial */
1264 if (bInitStep && ir->eI == eiVV)
1266 copy_rvecn(cbuf, state->v, 0, state->natoms);
1268 wallcycle_stop(wcycle, ewcUPDATE);
1271 /* MRS -- now done iterating -- compute the conserved quantity */
1274 saved_conserved_quantity = compute_conserved_from_auxiliary(ir, state, &MassQ);
1277 last_ekin = enerd->term[F_EKIN];
1279 if ((ir->eDispCorr != edispcEnerPres) && (ir->eDispCorr != edispcAllEnerPres))
1281 saved_conserved_quantity -= enerd->term[F_DISPCORR];
1283 /* sum up the foreign energy and dhdl terms for vv. currently done every step so that dhdl is correct in the .edr */
1286 sum_dhdl(enerd, state->lambda, ir->fepvals);
1290 /* ######## END FIRST UPDATE STEP ############## */
1291 /* ######## If doing VV, we now have v(dt) ###### */
1294 /* perform extended ensemble sampling in lambda - we don't
1295 actually move to the new state before outputting
1296 statistics, but if performing simulated tempering, we
1297 do update the velocities and the tau_t. */
1299 lamnew = ExpandedEnsembleDynamics(fplog, ir, enerd, state, &MassQ, state->fep_state, &state->dfhist, step, state->v, mdatoms);
1300 /* history is maintained in state->dfhist, but state_global is what is sent to trajectory and log output */
1301 copy_df_history(&state_global->dfhist, &state->dfhist);
1304 /* Now we have the energies and forces corresponding to the
1305 * coordinates at time t. We must output all of this before
1308 do_md_trajectory_writing(fplog, cr, nfile, fnm, step, step_rel, t,
1309 ir, state, state_global, top_global, fr,
1310 outf, mdebin, ekind, f, f_global,
1312 bCPT, bRerunMD, bLastStep, (Flags & MD_CONFOUT),
1314 /* Check if IMD step and do IMD communication, if bIMD is TRUE. */
1315 bIMDstep = do_IMD(ir->bIMD, step, cr, bNS, state->box, state->x, ir, t, wcycle);
1317 /* kludge -- virial is lost with restart for NPT control. Must restart */
1318 if (bStartingFromCpt && bVV)
1320 copy_mat(state->svir_prev, shake_vir);
1321 copy_mat(state->fvir_prev, force_vir);
1324 elapsed_time = walltime_accounting_get_current_elapsed_time(walltime_accounting);
1326 /* Check whether everything is still allright */
1327 if (((int)gmx_get_stop_condition() > handled_stop_condition)
1328 #ifdef GMX_THREAD_MPI
1333 /* this is just make gs.sig compatible with the hack
1334 of sending signals around by MPI_Reduce with together with
1336 if (gmx_get_stop_condition() == gmx_stop_cond_next_ns)
1338 gs.sig[eglsSTOPCOND] = 1;
1340 if (gmx_get_stop_condition() == gmx_stop_cond_next)
1342 gs.sig[eglsSTOPCOND] = -1;
1344 /* < 0 means stop at next step, > 0 means stop at next NS step */
1348 "\n\nReceived the %s signal, stopping at the next %sstep\n\n",
1349 gmx_get_signal_name(),
1350 gs.sig[eglsSTOPCOND] == 1 ? "NS " : "");
1354 "\n\nReceived the %s signal, stopping at the next %sstep\n\n",
1355 gmx_get_signal_name(),
1356 gs.sig[eglsSTOPCOND] == 1 ? "NS " : "");
1358 handled_stop_condition = (int)gmx_get_stop_condition();
1360 else if (MASTER(cr) && (bNS || ir->nstlist <= 0) &&
1361 (max_hours > 0 && elapsed_time > max_hours*60.0*60.0*0.99) &&
1362 gs.sig[eglsSTOPCOND] == 0 && gs.set[eglsSTOPCOND] == 0)
1364 /* Signal to terminate the run */
1365 gs.sig[eglsSTOPCOND] = 1;
1368 fprintf(fplog, "\nStep %s: Run time exceeded %.3f hours, will terminate the run\n", gmx_step_str(step, sbuf), max_hours*0.99);
1370 fprintf(stderr, "\nStep %s: Run time exceeded %.3f hours, will terminate the run\n", gmx_step_str(step, sbuf), max_hours*0.99);
1373 if (bResetCountersHalfMaxH && MASTER(cr) &&
1374 elapsed_time > max_hours*60.0*60.0*0.495)
1376 gs.sig[eglsRESETCOUNTERS] = 1;
1379 if (ir->nstlist == -1 && !bRerunMD)
1381 /* When bGStatEveryStep=FALSE, global_stat is only called
1382 * when we check the atom displacements, not at NS steps.
1383 * This means that also the bonded interaction count check is not
1384 * performed immediately after NS. Therefore a few MD steps could
1385 * be performed with missing interactions.
1386 * But wrong energies are never written to file,
1387 * since energies are only written after global_stat
1390 if (step >= nlh.step_nscheck)
1392 nlh.nabnsb = natoms_beyond_ns_buffer(ir, fr, &top->cgs,
1393 nlh.scale_tot, state->x);
1397 /* This is not necessarily true,
1398 * but step_nscheck is determined quite conservatively.
1404 /* In parallel we only have to check for checkpointing in steps
1405 * where we do global communication,
1406 * otherwise the other nodes don't know.
1408 if (MASTER(cr) && ((bGStat || !PAR(cr)) &&
1411 elapsed_time >= nchkpt*cpt_period*60.0)) &&
1412 gs.set[eglsCHKPT] == 0)
1414 gs.sig[eglsCHKPT] = 1;
1417 /* at the start of step, randomize or scale the velocities (trotter done elsewhere) */
1422 update_tcouple(step, ir, state, ekind, &MassQ, mdatoms);
1424 if (ETC_ANDERSEN(ir->etc)) /* keep this outside of update_tcouple because of the extra info required to pass */
1426 gmx_bool bIfRandomize;
1427 bIfRandomize = update_randomize_velocities(ir, step, cr, mdatoms, state, upd, constr);
1428 /* if we have constraints, we have to remove the kinetic energy parallel to the bonds */
1429 if (constr && bIfRandomize)
1431 update_constraints(fplog, step, NULL, ir, ekind, mdatoms,
1432 state, fr->bMolPBC, graph, f,
1433 &top->idef, tmp_vir,
1434 cr, nrnb, wcycle, upd, constr,
1435 TRUE, bCalcVir, vetanew);
1440 if (bIterativeCase && do_per_step(step, ir->nstpcouple))
1442 gmx_iterate_init(&iterate, TRUE);
1443 /* for iterations, we save these vectors, as we will be redoing the calculations */
1444 copy_coupling_state(state, bufstate, ekind, ekind_save, &(ir->opts));
1447 bFirstIterate = TRUE;
1448 while (bFirstIterate || iterate.bIterationActive)
1450 /* We now restore these vectors to redo the calculation with improved extended variables */
1451 if (iterate.bIterationActive)
1453 copy_coupling_state(bufstate, state, ekind_save, ekind, &(ir->opts));
1456 /* We make the decision to break or not -after- the calculation of Ekin and Pressure,
1457 so scroll down for that logic */
1459 /* ######### START SECOND UPDATE STEP ################# */
1460 /* Box is changed in update() when we do pressure coupling,
1461 * but we should still use the old box for energy corrections and when
1462 * writing it to the energy file, so it matches the trajectory files for
1463 * the same timestep above. Make a copy in a separate array.
1465 copy_mat(state->box, lastbox);
1469 if (!(bRerunMD && !rerun_fr.bV && !bForceUpdate))
1471 wallcycle_start(wcycle, ewcUPDATE);
1472 /* UPDATE PRESSURE VARIABLES IN TROTTER FORMULATION WITH CONSTRAINTS */
1475 if (iterate.bIterationActive)
1483 /* we use a new value of scalevir to converge the iterations faster */
1484 scalevir = tracevir/trace(shake_vir);
1486 msmul(shake_vir, scalevir, shake_vir);
1487 m_add(force_vir, shake_vir, total_vir);
1488 clear_mat(shake_vir);
1490 trotter_update(ir, step, ekind, enerd, state, total_vir, mdatoms, &MassQ, trotter_seq, ettTSEQ3);
1491 /* We can only do Berendsen coupling after we have summed
1492 * the kinetic energy or virial. Since the happens
1493 * in global_state after update, we should only do it at
1494 * step % nstlist = 1 with bGStatEveryStep=FALSE.
1499 update_tcouple(step, ir, state, ekind, &MassQ, mdatoms);
1500 update_pcouple(fplog, step, ir, state, pcoupl_mu, M, bInitStep);
1505 bUpdateDoLR = (fr->bTwinRange && do_per_step(step, ir->nstcalclr));
1507 /* velocity half-step update */
1508 update_coords(fplog, step, ir, mdatoms, state, fr->bMolPBC, f,
1509 bUpdateDoLR, fr->f_twin, bCalcVir ? &fr->vir_twin_constr : NULL, fcd,
1510 ekind, M, upd, FALSE, etrtVELOCITY2,
1511 cr, nrnb, constr, &top->idef);
1514 /* Above, initialize just copies ekinh into ekin,
1515 * it doesn't copy position (for VV),
1516 * and entire integrator for MD.
1519 if (ir->eI == eiVVAK)
1521 copy_rvecn(state->x, cbuf, 0, state->natoms);
1523 bUpdateDoLR = (fr->bTwinRange && do_per_step(step, ir->nstcalclr));
1525 update_coords(fplog, step, ir, mdatoms, state, fr->bMolPBC, f,
1526 bUpdateDoLR, fr->f_twin, bCalcVir ? &fr->vir_twin_constr : NULL, fcd,
1527 ekind, M, upd, bInitStep, etrtPOSITION, cr, nrnb, constr, &top->idef);
1528 wallcycle_stop(wcycle, ewcUPDATE);
1530 update_constraints(fplog, step, &dvdl_constr, ir, ekind, mdatoms, state,
1531 fr->bMolPBC, graph, f,
1532 &top->idef, shake_vir,
1533 cr, nrnb, wcycle, upd, constr,
1534 FALSE, bCalcVir, state->veta);
1536 if (bCalcVir && bUpdateDoLR && ir->nstcalclr > 1)
1538 /* Correct the virial for multiple time stepping */
1539 m_sub(shake_vir, fr->vir_twin_constr, shake_vir);
1542 if (ir->eI == eiVVAK)
1544 /* erase F_EKIN and F_TEMP here? */
1545 /* just compute the kinetic energy at the half step to perform a trotter step */
1546 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
1547 wcycle, enerd, force_vir, shake_vir, total_vir, pres, mu_tot,
1548 constr, NULL, FALSE, lastbox,
1549 top_global, &bSumEkinhOld,
1550 cglo_flags | CGLO_TEMPERATURE
1552 wallcycle_start(wcycle, ewcUPDATE);
1553 trotter_update(ir, step, ekind, enerd, state, total_vir, mdatoms, &MassQ, trotter_seq, ettTSEQ4);
1554 /* now we know the scaling, we can compute the positions again again */
1555 copy_rvecn(cbuf, state->x, 0, state->natoms);
1557 bUpdateDoLR = (fr->bTwinRange && do_per_step(step, ir->nstcalclr));
1559 update_coords(fplog, step, ir, mdatoms, state, fr->bMolPBC, f,
1560 bUpdateDoLR, fr->f_twin, bCalcVir ? &fr->vir_twin_constr : NULL, fcd,
1561 ekind, M, upd, bInitStep, etrtPOSITION, cr, nrnb, constr, &top->idef);
1562 wallcycle_stop(wcycle, ewcUPDATE);
1564 /* do we need an extra constraint here? just need to copy out of state->v to upd->xp? */
1565 /* are the small terms in the shake_vir here due
1566 * to numerical errors, or are they important
1567 * physically? I'm thinking they are just errors, but not completely sure.
1568 * For now, will call without actually constraining, constr=NULL*/
1569 update_constraints(fplog, step, NULL, ir, ekind, mdatoms,
1570 state, fr->bMolPBC, graph, f,
1571 &top->idef, tmp_vir,
1572 cr, nrnb, wcycle, upd, NULL,
1579 /* this factor or 2 correction is necessary
1580 because half of the constraint force is removed
1581 in the vv step, so we have to double it. See
1582 the Redmine issue #1255. It is not yet clear
1583 if the factor of 2 is exact, or just a very
1584 good approximation, and this will be
1585 investigated. The next step is to see if this
1586 can be done adding a dhdl contribution from the
1587 rattle step, but this is somewhat more
1588 complicated with the current code. Will be
1589 investigated, hopefully for 4.6.3. However,
1590 this current solution is much better than
1591 having it completely wrong.
1593 enerd->term[F_DVDL_CONSTR] += 2*dvdl_constr;
1597 enerd->term[F_DVDL_CONSTR] += dvdl_constr;
1602 /* Need to unshift here */
1603 unshift_self(graph, state->box, state->x);
1608 wallcycle_start(wcycle, ewcVSITECONSTR);
1611 shift_self(graph, state->box, state->x);
1613 construct_vsites(vsite, state->x, ir->delta_t, state->v,
1614 top->idef.iparams, top->idef.il,
1615 fr->ePBC, fr->bMolPBC, cr, state->box);
1619 unshift_self(graph, state->box, state->x);
1621 wallcycle_stop(wcycle, ewcVSITECONSTR);
1624 /* ############## IF NOT VV, Calculate globals HERE, also iterate constraints ############ */
1625 /* With Leap-Frog we can skip compute_globals at
1626 * non-communication steps, but we need to calculate
1627 * the kinetic energy one step before communication.
1629 if (bGStat || (!EI_VV(ir->eI) && do_per_step(step+1, nstglobalcomm)))
1631 if (ir->nstlist == -1 && bFirstIterate)
1633 gs.sig[eglsNABNSB] = nlh.nabnsb;
1635 compute_globals(fplog, gstat, cr, ir, fr, ekind, state, state_global, mdatoms, nrnb, vcm,
1636 wcycle, enerd, force_vir, shake_vir, total_vir, pres, mu_tot,
1638 bFirstIterate ? &gs : NULL,
1639 (step_rel % gs.nstms == 0) &&
1640 (multisim_nsteps < 0 || (step_rel < multisim_nsteps)),
1642 top_global, &bSumEkinhOld,
1644 | (!EI_VV(ir->eI) || bRerunMD ? CGLO_ENERGY : 0)
1645 | (!EI_VV(ir->eI) && bStopCM ? CGLO_STOPCM : 0)
1646 | (!EI_VV(ir->eI) ? CGLO_TEMPERATURE : 0)
1647 | (!EI_VV(ir->eI) || bRerunMD ? CGLO_PRESSURE : 0)
1648 | (iterate.bIterationActive ? CGLO_ITERATE : 0)
1649 | (bFirstIterate ? CGLO_FIRSTITERATE : 0)
1652 if (ir->nstlist == -1 && bFirstIterate)
1654 nlh.nabnsb = gs.set[eglsNABNSB];
1655 gs.set[eglsNABNSB] = 0;
1658 /* bIterate is set to keep it from eliminating the old ekin kinetic energy terms */
1659 /* ############# END CALC EKIN AND PRESSURE ################# */
1661 /* Note: this is OK, but there are some numerical precision issues with using the convergence of
1662 the virial that should probably be addressed eventually. state->veta has better properies,
1663 but what we actually need entering the new cycle is the new shake_vir value. Ideally, we could
1664 generate the new shake_vir, but test the veta value for convergence. This will take some thought. */
1666 if (iterate.bIterationActive &&
1667 done_iterating(cr, fplog, step, &iterate, bFirstIterate,
1668 trace(shake_vir), &tracevir))
1672 bFirstIterate = FALSE;
1675 if (!bVV || bRerunMD)
1677 /* sum up the foreign energy and dhdl terms for md and sd. currently done every step so that dhdl is correct in the .edr */
1678 sum_dhdl(enerd, state->lambda, ir->fepvals);
1680 update_box(fplog, step, ir, mdatoms, state, f,
1681 ir->nstlist == -1 ? &nlh.scale_tot : NULL, pcoupl_mu, nrnb, upd);
1683 /* ################# END UPDATE STEP 2 ################# */
1684 /* #### We now have r(t+dt) and v(t+dt/2) ############# */
1686 /* The coordinates (x) were unshifted in update */
1689 /* We will not sum ekinh_old,
1690 * so signal that we still have to do it.
1692 bSumEkinhOld = TRUE;
1695 /* ######### BEGIN PREPARING EDR OUTPUT ########### */
1697 /* use the directly determined last velocity, not actually the averaged half steps */
1698 if (bTrotter && ir->eI == eiVV)
1700 enerd->term[F_EKIN] = last_ekin;
1702 enerd->term[F_ETOT] = enerd->term[F_EPOT] + enerd->term[F_EKIN];
1706 enerd->term[F_ECONSERVED] = enerd->term[F_ETOT] + saved_conserved_quantity;
1710 enerd->term[F_ECONSERVED] = enerd->term[F_ETOT] + compute_conserved_from_auxiliary(ir, state, &MassQ);
1712 /* ######### END PREPARING EDR OUTPUT ########### */
1717 gmx_bool do_dr, do_or;
1719 if (fplog && do_log && bDoExpanded)
1721 /* only needed if doing expanded ensemble */
1722 PrintFreeEnergyInfoToFile(fplog, ir->fepvals, ir->expandedvals, ir->bSimTemp ? ir->simtempvals : NULL,
1723 &state_global->dfhist, state->fep_state, ir->nstlog, step);
1725 if (!(bStartingFromCpt && (EI_VV(ir->eI))))
1729 upd_mdebin(mdebin, bDoDHDL, TRUE,
1730 t, mdatoms->tmass, enerd, state,
1731 ir->fepvals, ir->expandedvals, lastbox,
1732 shake_vir, force_vir, total_vir, pres,
1733 ekind, mu_tot, constr);
1737 upd_mdebin_step(mdebin);
1740 do_dr = do_per_step(step, ir->nstdisreout);
1741 do_or = do_per_step(step, ir->nstorireout);
1743 print_ebin(mdoutf_get_fp_ene(outf), do_ene, do_dr, do_or, do_log ? fplog : NULL,
1745 eprNORMAL, bCompact, mdebin, fcd, groups, &(ir->opts));
1747 if (ir->ePull != epullNO)
1749 pull_print_output(ir->pull, step, t);
1752 if (do_per_step(step, ir->nstlog))
1754 if (fflush(fplog) != 0)
1756 gmx_fatal(FARGS, "Cannot flush logfile - maybe you are out of disk space?");
1762 /* Have to do this part _after_ outputting the logfile and the edr file */
1763 /* Gets written into the state at the beginning of next loop*/
1764 state->fep_state = lamnew;
1766 /* Print the remaining wall clock time for the run */
1767 if (MULTIMASTER(cr) && (do_verbose || gmx_got_usr_signal()) && !bPMETuneRunning)
1771 fprintf(stderr, "\n");
1773 print_time(stderr, walltime_accounting, step, ir, cr);
1776 /* Ion/water position swapping.
1777 * Not done in last step since trajectory writing happens before this call
1778 * in the MD loop and exchanges would be lost anyway. */
1779 bNeedRepartition = FALSE;
1780 if ((ir->eSwapCoords != eswapNO) && (step > 0) && !bLastStep &&
1781 do_per_step(step, ir->swap->nstswap))
1783 bNeedRepartition = do_swapcoords(cr, step, t, ir, wcycle,
1784 bRerunMD ? rerun_fr.x : state->x,
1785 bRerunMD ? rerun_fr.box : state->box,
1786 top_global, MASTER(cr) && bVerbose, bRerunMD);
1788 if (bNeedRepartition && DOMAINDECOMP(cr))
1790 dd_collect_state(cr->dd, state, state_global);
1794 /* Replica exchange */
1798 bExchanged = replica_exchange(fplog, cr, repl_ex,
1799 state_global, enerd,
1803 if ( (bExchanged || bNeedRepartition) && DOMAINDECOMP(cr) )
1805 dd_partition_system(fplog, step, cr, TRUE, 1,
1806 state_global, top_global, ir,
1807 state, &f, mdatoms, top, fr,
1808 vsite, shellfc, constr,
1809 nrnb, wcycle, FALSE);
1814 bStartingFromCpt = FALSE;
1816 /* ####### SET VARIABLES FOR NEXT ITERATION IF THEY STILL NEED IT ###### */
1817 /* With all integrators, except VV, we need to retain the pressure
1818 * at the current step for coupling at the next step.
1820 if ((state->flags & (1<<estPRES_PREV)) &&
1822 (ir->nstpcouple > 0 && step % ir->nstpcouple == 0)))
1824 /* Store the pressure in t_state for pressure coupling
1825 * at the next MD step.
1827 copy_mat(pres, state->pres_prev);
1830 /* ####### END SET VARIABLES FOR NEXT ITERATION ###### */
1832 if ( (membed != NULL) && (!bLastStep) )
1834 rescale_membed(step_rel, membed, state_global->x);
1841 /* read next frame from input trajectory */
1842 bNotLastFrame = read_next_frame(oenv, status, &rerun_fr);
1847 rerun_parallel_comm(cr, &rerun_fr, &bNotLastFrame);
1851 if (!bRerunMD || !rerun_fr.bStep)
1853 /* increase the MD step number */
1858 cycles = wallcycle_stop(wcycle, ewcSTEP);
1859 if (DOMAINDECOMP(cr) && wcycle)
1861 dd_cycles_add(cr->dd, cycles, ddCyclStep);
1864 if (bPMETuneRunning || bPMETuneTry)
1866 /* PME grid + cut-off optimization with GPUs or PME nodes */
1868 /* Count the total cycles over the last steps */
1869 cycles_pmes += cycles;
1871 /* We can only switch cut-off at NS steps */
1872 if (step % ir->nstlist == 0)
1874 /* PME grid + cut-off optimization with GPUs or PME nodes */
1877 if (DDMASTER(cr->dd))
1879 /* PME node load is too high, start tuning */
1880 bPMETuneRunning = (dd_pme_f_ratio(cr->dd) >= 1.05);
1882 dd_bcast(cr->dd, sizeof(gmx_bool), &bPMETuneRunning);
1884 if (bPMETuneRunning || step_rel > ir->nstlist*50)
1886 bPMETuneTry = FALSE;
1889 if (bPMETuneRunning)
1891 /* init_step might not be a multiple of nstlist,
1892 * but the first cycle is always skipped anyhow.
1895 pme_load_balance(pme_loadbal, cr,
1896 (bVerbose && MASTER(cr)) ? stderr : NULL,
1898 ir, state, cycles_pmes,
1899 fr->ic, fr->nbv, &fr->pmedata,
1902 /* Update constants in forcerec/inputrec to keep them in sync with fr->ic */
1903 fr->ewaldcoeff_q = fr->ic->ewaldcoeff_q;
1904 fr->ewaldcoeff_lj = fr->ic->ewaldcoeff_lj;
1905 fr->rlist = fr->ic->rlist;
1906 fr->rlistlong = fr->ic->rlistlong;
1907 fr->rcoulomb = fr->ic->rcoulomb;
1908 fr->rvdw = fr->ic->rvdw;
1910 if (ir->eDispCorr != edispcNO)
1912 calc_enervirdiff(NULL, ir->eDispCorr, fr);
1919 if (step_rel == wcycle_get_reset_counters(wcycle) ||
1920 gs.set[eglsRESETCOUNTERS] != 0)
1922 /* Reset all the counters related to performance over the run */
1923 reset_all_counters(fplog, cr, step, &step_rel, ir, wcycle, nrnb, walltime_accounting,
1924 use_GPU(fr->nbv) ? fr->nbv : NULL);
1925 wcycle_set_reset_counters(wcycle, -1);
1926 if (!(cr->duty & DUTY_PME))
1928 /* Tell our PME node to reset its counters */
1929 gmx_pme_send_resetcounters(cr, step);
1931 /* Correct max_hours for the elapsed time */
1932 max_hours -= elapsed_time/(60.0*60.0);
1933 bResetCountersHalfMaxH = FALSE;
1934 gs.set[eglsRESETCOUNTERS] = 0;
1937 /* If bIMD is TRUE, the master updates the IMD energy record and sends positions to VMD client */
1938 IMD_prep_energies_send_positions(ir->bIMD && MASTER(cr), bIMDstep, ir->imd, enerd, step, bCalcEner, wcycle);
1941 /* End of main MD loop */
1944 /* Closing TNG files can include compressing data. Therefore it is good to do that
1945 * before stopping the time measurements. */
1946 mdoutf_tng_close(outf);
1948 /* Stop measuring walltime */
1949 walltime_accounting_end(walltime_accounting);
1951 if (bRerunMD && MASTER(cr))
1956 if (!(cr->duty & DUTY_PME))
1958 /* Tell the PME only node to finish */
1959 gmx_pme_send_finish(cr);
1964 if (ir->nstcalcenergy > 0 && !bRerunMD)
1966 print_ebin(mdoutf_get_fp_ene(outf), FALSE, FALSE, FALSE, fplog, step, t,
1967 eprAVER, FALSE, mdebin, fcd, groups, &(ir->opts));
1974 if (ir->nstlist == -1 && nlh.nns > 0 && fplog)
1976 fprintf(fplog, "Average neighborlist lifetime: %.1f steps, std.dev.: %.1f steps\n", nlh.s1/nlh.nns, sqrt(nlh.s2/nlh.nns - sqr(nlh.s1/nlh.nns)));
1977 fprintf(fplog, "Average number of atoms that crossed the half buffer length: %.1f\n\n", nlh.ab/nlh.nns);
1980 if (pme_loadbal != NULL)
1982 pme_loadbal_done(pme_loadbal, cr, fplog,
1986 if (shellfc && fplog)
1988 fprintf(fplog, "Fraction of iterations that converged: %.2f %%\n",
1989 (nconverged*100.0)/step_rel);
1990 fprintf(fplog, "Average number of force evaluations per MD step: %.2f\n\n",
1994 if (repl_ex_nst > 0 && MASTER(cr))
1996 print_replica_exchange_statistics(fplog, repl_ex);
1999 /* IMD cleanup, if bIMD is TRUE. */
2000 IMD_finalize(ir->bIMD, ir->imd);
2002 walltime_accounting_set_nsteps_done(walltime_accounting, step_rel);