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37 /* This file is completely threadsafe - keep it that way! */
46 #include "types/commrec.h"
48 #include "gromacs/utility/futil.h"
53 #include "mtop_util.h"
55 #include "gromacs/math/vec.h"
56 #include "gromacs/pbcutil/mshift.h"
57 #include "gromacs/utility/fatalerror.h"
58 #include "gromacs/utility/smalloc.h"
60 void init_disres(FILE *fplog, const gmx_mtop_t *mtop,
61 t_inputrec *ir, const t_commrec *cr,
62 t_fcdata *fcd, t_state *state, gmx_bool bIsREMD)
64 int fa, nmol, i, npair, np;
68 gmx_mtop_ilistloop_t iloop;
74 if (gmx_mtop_ftype_count(mtop, F_DISRES) == 0)
83 fprintf(fplog, "Initializing the distance restraints\n");
87 if (ir->eDisre == edrEnsemble)
89 gmx_fatal(FARGS, "Sorry, distance restraints with ensemble averaging over multiple molecules in one system are not functional in this version of GROMACS");
92 dd->dr_weighting = ir->eDisreWeighting;
93 dd->dr_fc = ir->dr_fc;
94 if (EI_DYNAMICS(ir->eI))
96 dd->dr_tau = ir->dr_tau;
102 if (dd->dr_tau == 0.0)
104 dd->dr_bMixed = FALSE;
109 dd->dr_bMixed = ir->bDisreMixed;
110 dd->ETerm = exp(-(ir->delta_t/ir->dr_tau));
112 dd->ETerm1 = 1.0 - dd->ETerm;
114 ip = mtop->ffparams.iparams;
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 (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)
268 int fa, res, i, pair, ki, kj, m;
271 real *rt, *rm3tav, *Rtl_6, *Rt_6, *Rtav_6;
272 real rt_1, rt_3, rt2;
275 real ETerm, ETerm1, cf1 = 0, cf2 = 0, invn = 0;
279 bTav = (dd->dr_tau != 0);
290 /* scaling factor to smoothly turn on the restraint forces *
291 * when using time averaging */
292 dd->exp_min_t_tau = hist->disre_initf*ETerm;
294 cf1 = dd->exp_min_t_tau;
295 cf2 = 1.0/(1.0 - dd->exp_min_t_tau);
298 if (dd->nsystems > 1)
300 invn = 1.0/dd->nsystems;
303 /* 'loop' over all atom pairs (pair_nr=fa/3) involved in restraints, *
304 * the total number of atoms pairs is nfa/3 */
309 type = forceatoms[fa];
310 npair = ip[type].disres.npair;
315 /* Loop over the atom pairs of 'this' restraint */
317 while (fa < nfa && np < npair)
320 ai = forceatoms[fa+1];
321 aj = forceatoms[fa+2];
325 pbc_dx_aiuc(pbc, x[ai], x[aj], dx);
329 rvec_sub(x[ai], x[aj], dx);
332 rt_1 = gmx_invsqrt(rt2);
333 rt_3 = rt_1*rt_1*rt_1;
335 rt[pair] = sqrt(rt2);
338 /* Here we update rm3tav in t_fcdata using the data
340 * Thus the results stay correct when this routine
341 * is called multiple times.
343 rm3tav[pair] = cf2*((ETerm - cf1)*hist->disre_rm3tav[pair] +
351 Rt_6[res] += rt_3*rt_3;
352 Rtav_6[res] += rm3tav[pair]*rm3tav[pair];
357 if (dd->nsystems > 1)
359 Rtl_6[res] = Rt_6[res];
368 real ta_disres(int nfa, const t_iatom forceatoms[], const t_iparams ip[],
369 const rvec x[], rvec f[], rvec fshift[],
370 const t_pbc *pbc, const t_graph *g,
371 real gmx_unused lambda, real gmx_unused *dvdlambda,
372 const t_mdatoms gmx_unused *md, t_fcdata *fcd,
373 int gmx_unused *global_atom_index)
375 const real sixth = 1.0/6.0;
376 const real seven_three = 7.0/3.0;
379 int fa, res, npair, p, pair, ki = CENTRAL, m;
383 real smooth_fc, Rt, Rtav, rt2, *Rtl_6, *Rt_6, *Rtav_6;
384 real k0, f_scal = 0, fmax_scal, fk_scal, fij;
385 real tav_viol, instant_viol, mixed_viol, violtot, vtot;
386 real tav_viol_Rtav7, instant_viol_Rtav7;
388 gmx_bool bConservative, bMixed, bViolation;
395 dr_weighting = dd->dr_weighting;
396 dr_bMixed = dd->dr_bMixed;
401 tav_viol = instant_viol = mixed_viol = tav_viol_Rtav7 = instant_viol_Rtav7 = 0;
403 smooth_fc = dd->dr_fc;
406 /* scaling factor to smoothly turn on the restraint forces *
407 * when using time averaging */
408 smooth_fc *= (1.0 - dd->exp_min_t_tau);
414 /* 'loop' over all atom pairs (pair_nr=fa/3) involved in restraints, *
415 * the total number of atoms pairs is nfa/3 */
420 type = forceatoms[fa];
421 /* Take action depending on restraint, calculate scalar force */
422 npair = ip[type].disres.npair;
423 up1 = ip[type].disres.up1;
424 up2 = ip[type].disres.up2;
425 low = ip[type].disres.low;
426 k0 = smooth_fc*ip[type].disres.kfac;
428 /* save some flops when there is only one pair */
429 if (ip[type].disres.type != 2)
431 bConservative = (dr_weighting == edrwConservative) && (npair > 1);
433 Rt = pow(Rt_6[res], -sixth);
434 Rtav = pow(Rtav_6[res], -sixth);
438 /* When rtype=2 use instantaneous not ensemble avereged distance */
439 bConservative = (npair > 1);
441 Rt = pow(Rtl_6[res], -sixth);
448 tav_viol = Rtav - up1;
453 tav_viol = Rtav - low;
463 * there is no real potential when time averaging is applied
465 vtot += 0.5*k0*sqr(tav_viol);
468 printf("vtot is inf: %f\n", vtot);
472 f_scal = -k0*tav_viol;
473 violtot += fabs(tav_viol);
481 instant_viol = Rt - up1;
492 instant_viol = Rt - low;
505 mixed_viol = sqrt(tav_viol*instant_viol);
506 f_scal = -k0*mixed_viol;
507 violtot += mixed_viol;
514 fmax_scal = -k0*(up2-up1);
515 /* Correct the force for the number of restraints */
518 f_scal = max(f_scal, fmax_scal);
521 f_scal *= Rtav/Rtav_6[res];
525 f_scal /= 2*mixed_viol;
526 tav_viol_Rtav7 = tav_viol*Rtav/Rtav_6[res];
527 instant_viol_Rtav7 = instant_viol*Rt/Rt_6[res];
532 f_scal /= (real)npair;
533 f_scal = max(f_scal, fmax_scal);
536 /* Exert the force ... */
538 /* Loop over the atom pairs of 'this' restraint */
539 for (p = 0; p < npair; p++)
542 ai = forceatoms[fa+1];
543 aj = forceatoms[fa+2];
547 ki = pbc_dx_aiuc(pbc, x[ai], x[aj], dx);
551 rvec_sub(x[ai], x[aj], dx);
555 weight_rt_1 = gmx_invsqrt(rt2);
561 weight_rt_1 *= pow(dd->rm3tav[pair], seven_three);
565 weight_rt_1 *= tav_viol_Rtav7*pow(dd->rm3tav[pair], seven_three)+
566 instant_viol_Rtav7*pow(dd->rt[pair], -7);
570 fk_scal = f_scal*weight_rt_1;
574 ivec_sub(SHIFT_IVEC(g, ai), SHIFT_IVEC(g, aj), dt);
578 for (m = 0; m < DIM; m++)
584 fshift[ki][m] += fij;
585 fshift[CENTRAL][m] -= fij;
592 /* No violation so force and potential contributions */
598 dd->sumviol = violtot;
604 void update_disres_history(t_fcdata *fcd, history_t *hist)
612 /* Copy the new time averages that have been calculated
613 * in calc_disres_R_6.
615 hist->disre_initf = dd->exp_min_t_tau;
616 for (pair = 0; pair < dd->npair; pair++)
618 hist->disre_rm3tav[pair] = dd->rm3tav[pair];