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37 /* This file is completely threadsafe - keep it that way! */
40 #include "gromacs/legacyheaders/disre.h"
49 #include "gromacs/legacyheaders/copyrite.h"
50 #include "gromacs/legacyheaders/macros.h"
51 #include "gromacs/legacyheaders/main.h"
52 #include "gromacs/legacyheaders/typedefs.h"
53 #include "gromacs/legacyheaders/types/commrec.h"
54 #include "gromacs/math/vec.h"
55 #include "gromacs/pbcutil/ishift.h"
56 #include "gromacs/pbcutil/mshift.h"
57 #include "gromacs/pbcutil/pbc.h"
58 #include "gromacs/topology/mtop_util.h"
59 #include "gromacs/utility/fatalerror.h"
60 #include "gromacs/utility/futil.h"
61 #include "gromacs/utility/smalloc.h"
63 void init_disres(FILE *fplog, const gmx_mtop_t *mtop,
64 t_inputrec *ir, const t_commrec *cr,
65 t_fcdata *fcd, t_state *state, gmx_bool bIsREMD)
67 int fa, nmol, npair, np;
70 gmx_mtop_ilistloop_t iloop;
76 if (gmx_mtop_ftype_count(mtop, F_DISRES) == 0)
85 fprintf(fplog, "Initializing the distance restraints\n");
89 if (ir->eDisre == edrEnsemble)
91 gmx_fatal(FARGS, "Sorry, distance restraints with ensemble averaging over multiple molecules in one system are not functional in this version of GROMACS");
94 dd->dr_weighting = ir->eDisreWeighting;
95 dd->dr_fc = ir->dr_fc;
96 if (EI_DYNAMICS(ir->eI))
98 dd->dr_tau = ir->dr_tau;
104 if (dd->dr_tau == 0.0)
106 dd->dr_bMixed = FALSE;
111 dd->dr_bMixed = ir->bDisreMixed;
112 dd->ETerm = exp(-(ir->delta_t/ir->dr_tau));
114 dd->ETerm1 = 1.0 - dd->ETerm;
118 iloop = gmx_mtop_ilistloop_init(mtop);
119 while (gmx_mtop_ilistloop_next(iloop, &il, &nmol))
122 for (fa = 0; fa < il[F_DISRES].nr; fa += 3)
125 npair = mtop->ffparams.iparams[il[F_DISRES].iatoms[fa]].disres.npair;
128 dd->nres += (ir->eDisre == edrEnsemble ? 1 : nmol)*npair;
129 dd->npair += nmol*npair;
137 /* Temporary check, will be removed when disre is implemented with DD */
138 const char *notestr = "NOTE: atoms involved in distance restraints should be within the same domain. If this is not the case mdrun generates a fatal error. If you encounter this, use a single MPI rank (Verlet+OpenMP+GPUs work fine).";
142 fprintf(stderr, "\n%s\n\n", notestr);
146 fprintf(fplog, "%s\n", notestr);
149 if (dd->dr_tau != 0 || ir->eDisre == edrEnsemble || cr->ms != NULL ||
150 dd->nres != dd->npair)
152 gmx_fatal(FARGS, "Time or ensemble averaged or multiple pair distance restraints do not work (yet) with domain decomposition, use a single MPI rank%s", cr->ms ? " per simulation" : "");
154 if (ir->nstdisreout != 0)
158 fprintf(fplog, "\nWARNING: Can not write distance restraint data to energy file with domain decomposition\n\n");
162 fprintf(stderr, "\nWARNING: Can not write distance restraint data to energy file with domain decomposition\n");
168 snew(dd->rt, dd->npair);
170 if (dd->dr_tau != 0.0)
173 /* Set the "history lack" factor to 1 */
174 state->flags |= (1<<estDISRE_INITF);
175 hist->disre_initf = 1.0;
176 /* Allocate space for the r^-3 time averages */
177 state->flags |= (1<<estDISRE_RM3TAV);
178 hist->ndisrepairs = dd->npair;
179 snew(hist->disre_rm3tav, hist->ndisrepairs);
181 /* Allocate space for a copy of rm3tav,
182 * so we can call do_force without modifying the state.
184 snew(dd->rm3tav, dd->npair);
186 /* Allocate Rt_6 and Rtav_6 consecutively in memory so they can be
187 * averaged over the processors in one call (in calc_disre_R_6)
189 snew(dd->Rt_6, 2*dd->nres);
190 dd->Rtav_6 = &(dd->Rt_6[dd->nres]);
192 ptr = getenv("GMX_DISRE_ENSEMBLE_SIZE");
193 if (cr && cr->ms != NULL && ptr != NULL && !bIsREMD)
197 sscanf(ptr, "%d", &dd->nsystems);
200 fprintf(fplog, "Found GMX_DISRE_ENSEMBLE_SIZE set to %d systems per ensemble\n", dd->nsystems);
202 /* This check is only valid on MASTER(cr), so probably
203 * ensemble-averaged distance restraints are broken on more
204 * than one processor per simulation system. */
207 check_multi_int(fplog, cr->ms, dd->nsystems,
208 "the number of systems per ensemble",
211 gmx_bcast_sim(sizeof(int), &dd->nsystems, cr);
213 /* We use to allow any value of nsystems which was a divisor
214 * of ms->nsim. But this required an extra communicator which
215 * was stored in t_fcdata. This pulled in mpi.h in nearly all C files.
217 if (!(cr->ms->nsim == 1 || cr->ms->nsim == dd->nsystems))
219 gmx_fatal(FARGS, "GMX_DISRE_ENSEMBLE_SIZE (%d) is not equal to 1 or the number of systems (option -multi) %d", dd->nsystems, cr->ms->nsim);
223 fprintf(fplog, "Our ensemble consists of systems:");
224 for (int i = 0; i < dd->nsystems; i++)
226 fprintf(fplog, " %d",
227 (cr->ms->sim/dd->nsystems)*dd->nsystems+i);
229 fprintf(fplog, "\n");
231 snew(dd->Rtl_6, dd->nres);
237 dd->Rtl_6 = dd->Rt_6;
244 fprintf(fplog, "There are %d distance restraints involving %d atom pairs\n", dd->nres, dd->npair);
246 /* Have to avoid g_disre de-referencing cr blindly, mdrun not
247 * doing consistency checks for ensemble-averaged distance
248 * restraints when that's not happening, and only doing those
249 * checks from appropriate processes (since check_multi_int is
250 * too broken to check whether the communication will
252 if (cr && cr->ms && dd->nsystems > 1 && MASTER(cr))
254 check_multi_int(fplog, cr->ms, fcd->disres.nres,
255 "the number of distance restraints",
258 please_cite(fplog, "Tropp80a");
259 please_cite(fplog, "Torda89a");
263 void calc_disres_R_6(int nfa, const t_iatom forceatoms[], const t_iparams ip[],
264 const rvec x[], const t_pbc *pbc,
265 t_fcdata *fcd, history_t *hist)
271 real *rt, *rm3tav, *Rtl_6, *Rt_6, *Rtav_6;
272 real rt_1, rt_3, rt2;
274 real ETerm, ETerm1, cf1 = 0, cf2 = 0, invn = 0;
278 bTav = (dd->dr_tau != 0);
289 /* scaling factor to smoothly turn on the restraint forces *
290 * when using time averaging */
291 dd->exp_min_t_tau = hist->disre_initf*ETerm;
293 cf1 = dd->exp_min_t_tau;
294 cf2 = 1.0/(1.0 - dd->exp_min_t_tau);
297 if (dd->nsystems > 1)
299 invn = 1.0/dd->nsystems;
302 /* 'loop' over all atom pairs (pair_nr=fa/3) involved in restraints, *
303 * the total number of atoms pairs is nfa/3 */
308 type = forceatoms[fa];
309 npair = ip[type].disres.npair;
314 /* Loop over the atom pairs of 'this' restraint */
316 while (fa < nfa && np < npair)
319 ai = forceatoms[fa+1];
320 aj = forceatoms[fa+2];
324 pbc_dx_aiuc(pbc, x[ai], x[aj], dx);
328 rvec_sub(x[ai], x[aj], dx);
331 rt_1 = gmx_invsqrt(rt2);
332 rt_3 = rt_1*rt_1*rt_1;
334 rt[pair] = sqrt(rt2);
337 /* Here we update rm3tav in t_fcdata using the data
339 * Thus the results stay correct when this routine
340 * is called multiple times.
342 rm3tav[pair] = cf2*((ETerm - cf1)*hist->disre_rm3tav[pair] +
350 Rt_6[res] += rt_3*rt_3;
351 Rtav_6[res] += rm3tav[pair]*rm3tav[pair];
356 if (dd->nsystems > 1)
358 Rtl_6[res] = Rt_6[res];
367 real ta_disres(int nfa, const t_iatom forceatoms[], const t_iparams ip[],
368 const rvec x[], rvec f[], rvec fshift[],
369 const t_pbc *pbc, const t_graph *g,
370 real gmx_unused lambda, real gmx_unused *dvdlambda,
371 const t_mdatoms gmx_unused *md, t_fcdata *fcd,
372 int gmx_unused *global_atom_index)
374 const real sixth = 1.0/6.0;
375 const real seven_three = 7.0/3.0;
378 int fa, res, npair, p, pair, ki = CENTRAL, m;
382 real smooth_fc, Rt, Rtav, rt2, *Rtl_6, *Rt_6, *Rtav_6;
383 real k0, f_scal = 0, fmax_scal, fk_scal, fij;
384 real tav_viol, instant_viol, mixed_viol, violtot, vtot;
385 real tav_viol_Rtav7, instant_viol_Rtav7;
387 gmx_bool bConservative, bMixed, bViolation;
394 dr_weighting = dd->dr_weighting;
395 dr_bMixed = dd->dr_bMixed;
400 tav_viol = instant_viol = mixed_viol = tav_viol_Rtav7 = instant_viol_Rtav7 = 0;
402 smooth_fc = dd->dr_fc;
405 /* scaling factor to smoothly turn on the restraint forces *
406 * when using time averaging */
407 smooth_fc *= (1.0 - dd->exp_min_t_tau);
413 /* 'loop' over all atom pairs (pair_nr=fa/3) involved in restraints, *
414 * the total number of atoms pairs is nfa/3 */
419 type = forceatoms[fa];
420 /* Take action depending on restraint, calculate scalar force */
421 npair = ip[type].disres.npair;
422 up1 = ip[type].disres.up1;
423 up2 = ip[type].disres.up2;
424 low = ip[type].disres.low;
425 k0 = smooth_fc*ip[type].disres.kfac;
427 /* save some flops when there is only one pair */
428 if (ip[type].disres.type != 2)
430 bConservative = (dr_weighting == edrwConservative) && (npair > 1);
432 Rt = pow(Rt_6[res], -sixth);
433 Rtav = pow(Rtav_6[res], -sixth);
437 /* When rtype=2 use instantaneous not ensemble avereged distance */
438 bConservative = (npair > 1);
440 Rt = pow(Rtl_6[res], -sixth);
447 tav_viol = Rtav - up1;
452 tav_viol = Rtav - low;
462 * there is no real potential when time averaging is applied
464 vtot += 0.5*k0*sqr(tav_viol);
467 printf("vtot is inf: %f\n", vtot);
471 f_scal = -k0*tav_viol;
472 violtot += fabs(tav_viol);
480 instant_viol = Rt - up1;
491 instant_viol = Rt - low;
504 mixed_viol = sqrt(tav_viol*instant_viol);
505 f_scal = -k0*mixed_viol;
506 violtot += mixed_viol;
513 fmax_scal = -k0*(up2-up1);
514 /* Correct the force for the number of restraints */
517 f_scal = std::max(f_scal, fmax_scal);
520 f_scal *= Rtav/Rtav_6[res];
524 f_scal /= 2*mixed_viol;
525 tav_viol_Rtav7 = tav_viol*Rtav/Rtav_6[res];
526 instant_viol_Rtav7 = instant_viol*Rt/Rt_6[res];
531 f_scal /= (real)npair;
532 f_scal = std::max(f_scal, fmax_scal);
535 /* Exert the force ... */
537 /* Loop over the atom pairs of 'this' restraint */
538 for (p = 0; p < npair; p++)
541 ai = forceatoms[fa+1];
542 aj = forceatoms[fa+2];
546 ki = pbc_dx_aiuc(pbc, x[ai], x[aj], dx);
550 rvec_sub(x[ai], x[aj], dx);
554 weight_rt_1 = gmx_invsqrt(rt2);
560 weight_rt_1 *= pow(dd->rm3tav[pair], seven_three);
564 weight_rt_1 *= tav_viol_Rtav7*pow(dd->rm3tav[pair], seven_three)+
565 instant_viol_Rtav7*pow(dd->rt[pair], -7);
569 fk_scal = f_scal*weight_rt_1;
573 ivec_sub(SHIFT_IVEC(g, ai), SHIFT_IVEC(g, aj), dt);
577 for (m = 0; m < DIM; m++)
583 fshift[ki][m] += fij;
584 fshift[CENTRAL][m] -= fij;
591 /* No violation so force and potential contributions */
597 dd->sumviol = violtot;
603 void update_disres_history(t_fcdata *fcd, history_t *hist)
611 /* Copy the new time averages that have been calculated
612 * in calc_disres_R_6.
614 hist->disre_initf = dd->exp_min_t_tau;
615 for (pair = 0; pair < dd->npair; pair++)
617 hist->disre_rm3tav[pair] = dd->rm3tav[pair];