static void calc_x_times_f(int nxf, const rvec x[], const rvec f[],
gmx_bool bScrewPBC, const matrix box,
matrix x_times_f)
{
clear_mat(x_times_f);
for (int i = 0; i < nxf; i++)
{
for (int d = 0; d < DIM; d++)
{
for (int n = 0; n < DIM; n++)
{
x_times_f[d][n] += x[i][d]*f[i][n];
}
}
if (bScrewPBC)
{
int isx = IS2X(i);
/* We should correct all odd x-shifts, but the range of isx is -2 to 2 */
if (isx == 1 || isx == -1)
{
for (int d = 0; d < DIM; d++)
{
for (int n = 0; n < DIM; n++)
{
x_times_f[d][n] += box[d][d]*f[i][n];
}
}
}
}
}
}
void calc_vir(int nxf, rvec x[], rvec f[], tensor vir,
gmx_bool bScrewPBC, matrix box)
{
int i;
double dvxx = 0, dvxy = 0, dvxz = 0, dvyx = 0, dvyy = 0, dvyz = 0, dvzx = 0, dvzy = 0, dvzz = 0;
#pragma omp parallel for num_threads(gmx_omp_nthreads_get(emntDefault)) \
schedule(static) \
reduction(+: dvxx, dvxy, dvxz, dvyx, dvyy, dvyz, dvzx, dvzy, dvzz)
for (i = 0; i < nxf; i++)
{
dvxx += x[i][XX]*f[i][XX];
dvxy += x[i][XX]*f[i][YY];
dvxz += x[i][XX]*f[i][ZZ];
dvyx += x[i][YY]*f[i][XX];
dvyy += x[i][YY]*f[i][YY];
dvyz += x[i][YY]*f[i][ZZ];
dvzx += x[i][ZZ]*f[i][XX];
dvzy += x[i][ZZ]*f[i][YY];
dvzz += x[i][ZZ]*f[i][ZZ];
if (bScrewPBC)
{
int isx = IS2X(i);
/* We should correct all odd x-shifts, but the range of isx is -2 to 2 */
if (isx == 1 || isx == -1)
{
dvyy += box[YY][YY]*f[i][YY];
dvyz += box[YY][YY]*f[i][ZZ];
dvzy += box[ZZ][ZZ]*f[i][YY];
dvzz += box[ZZ][ZZ]*f[i][ZZ];
}
}
}
upd_vir(vir[XX], dvxx, dvxy, dvxz);
upd_vir(vir[YY], dvyx, dvyy, dvyz);
upd_vir(vir[ZZ], dvzx, dvzy, dvzz);
}
void calc_vir(int nxf, rvec x[], rvec f[], tensor vir,
gmx_bool bScrewPBC, matrix box)
{
int i, isx;
double dvxx = 0, dvxy = 0, dvxz = 0, dvyx = 0, dvyy = 0, dvyz = 0, dvzx = 0, dvzy = 0, dvzz = 0;
for (i = 0; (i < nxf); i++)
{
dvxx += x[i][XX]*f[i][XX];
dvxy += x[i][XX]*f[i][YY];
dvxz += x[i][XX]*f[i][ZZ];
dvyx += x[i][YY]*f[i][XX];
dvyy += x[i][YY]*f[i][YY];
dvyz += x[i][YY]*f[i][ZZ];
dvzx += x[i][ZZ]*f[i][XX];
dvzy += x[i][ZZ]*f[i][YY];
dvzz += x[i][ZZ]*f[i][ZZ];
if (bScrewPBC)
{
isx = IS2X(i);
/* We should correct all odd x-shifts, but the range of isx is -2 to 2 */
if (isx == 1 || isx == -1)
{
dvyy += box[YY][YY]*f[i][YY];
dvyz += box[YY][YY]*f[i][ZZ];
dvzy += box[ZZ][ZZ]*f[i][YY];
dvzz += box[ZZ][ZZ]*f[i][ZZ];
}
}
}
upd_vir(vir[XX], dvxx, dvxy, dvxz);
upd_vir(vir[YY], dvyx, dvyy, dvyz);
upd_vir(vir[ZZ], dvzx, dvzy, dvzz);
}
void update_QMMMrec(t_commrec *cr,
t_forcerec *fr,
rvec x[],
t_mdatoms *md,
matrix box,
gmx_localtop_t *top)
{
/* updates the coordinates of both QM atoms and MM atoms and stores
* them in the QMMMrec.
*
* NOTE: is NOT yet working if there are no PBC. Also in ns.c, simple
* ns needs to be fixed!
*/
int
mm_max=0,mm_nr=0,mm_nr_new,i,j,is,k,shift;
t_j_particle
*mm_j_particles=NULL,*qm_i_particles=NULL;
t_QMMMrec
*qr;
t_nblist
QMMMlist;
rvec
dx,crd;
int
*MMatoms;
t_QMrec
*qm;
t_MMrec
*mm;
t_pbc
pbc;
int
*parallelMMarray=NULL;
real
c12au,c6au;
c6au = (HARTREE2KJ*AVOGADRO*pow(BOHR2NM,6));
c12au = (HARTREE2KJ*AVOGADRO*pow(BOHR2NM,12));
/* every cpu has this array. On every processor we fill this array
* with 1's and 0's. 1's indicate the atoms is a QM atom on the
* current cpu in a later stage these arrays are all summed. indexes
* > 0 indicate the atom is a QM atom. Every node therefore knows
* whcih atoms are part of the QM subsystem.
*/
/* copy some pointers */
qr = fr->qr;
mm = qr->mm;
QMMMlist = fr->QMMMlist;
/* init_pbc(box); needs to be called first, see pbc.h */
set_pbc_dd(&pbc,fr->ePBC,DOMAINDECOMP(cr) ? cr->dd : NULL,FALSE,box);
/* only in standard (normal) QMMM we need the neighbouring MM
* particles to provide a electric field of point charges for the QM
* atoms.
*/
if(qr->QMMMscheme==eQMMMschemenormal){ /* also implies 1 QM-layer */
/* we NOW create/update a number of QMMMrec entries:
*
* 1) the shiftQM, containing the shifts of the QM atoms
*
* 2) the indexMM array, containing the index of the MM atoms
*
* 3) the shiftMM, containing the shifts of the MM atoms
*
* 4) the shifted coordinates of the MM atoms
*
* the shifts are used for computing virial of the QM/MM particles.
*/
qm = qr->qm[0]; /* in case of normal QMMM, there is only one group */
snew(qm_i_particles,QMMMlist.nri);
if(QMMMlist.nri){
qm_i_particles[0].shift = XYZ2IS(0,0,0);
for(i=0;i<QMMMlist.nri;i++){
qm_i_particles[i].j = QMMMlist.iinr[i];
if(i){
qm_i_particles[i].shift = pbc_dx_aiuc(&pbc,x[QMMMlist.iinr[0]],
x[QMMMlist.iinr[i]],dx);
}
/* However, since nri >= nrQMatoms, we do a quicksort, and throw
* out double, triple, etc. entries later, as we do for the MM
* list too.
*/
/* compute the shift for the MM j-particles with respect to
* the QM i-particle and store them.
*/
crd[0] = IS2X(QMMMlist.shift[i]) + IS2X(qm_i_particles[i].shift);
crd[1] = IS2Y(QMMMlist.shift[i]) + IS2Y(qm_i_particles[i].shift);
crd[2] = IS2Z(QMMMlist.shift[i]) + IS2Z(qm_i_particles[i].shift);
is = XYZ2IS(crd[0],crd[1],crd[2]);
for(j=QMMMlist.jindex[i];
j<QMMMlist.jindex[i+1];
j++){
if(mm_nr >= mm_max){
mm_max += 1000;
srenew(mm_j_particles,mm_max);
}
mm_j_particles[mm_nr].j = QMMMlist.jjnr[j];
mm_j_particles[mm_nr].shift = is;
mm_nr++;
}
}
/* quicksort QM and MM shift arrays and throw away multiple entries */
qsort(qm_i_particles,QMMMlist.nri,
(size_t)sizeof(qm_i_particles[0]),
struct_comp);
qsort(mm_j_particles,mm_nr,
(size_t)sizeof(mm_j_particles[0]),
struct_comp);
/* remove multiples in the QM shift array, since in init_QMMM() we
* went through the atom numbers from 0 to md.nr, the order sorted
* here matches the one of QMindex already.
*/
j=0;
for(i=0;i<QMMMlist.nri;i++){
if (i==0 || qm_i_particles[i].j!=qm_i_particles[i-1].j){
qm_i_particles[j++] = qm_i_particles[i];
}
}
mm_nr_new = 0;
if(qm->bTS||qm->bOPT){
/* only remove double entries for the MM array */
for(i=0;i<mm_nr;i++){
if((i==0 || mm_j_particles[i].j!=mm_j_particles[i-1].j)
&& !md->bQM[mm_j_particles[i].j]){
mm_j_particles[mm_nr_new++] = mm_j_particles[i];
}
}
}
/* we also remove mm atoms that have no charges!
* actually this is already done in the ns.c
*/
else{
for(i=0;i<mm_nr;i++){
if((i==0 || mm_j_particles[i].j!=mm_j_particles[i-1].j)
&& !md->bQM[mm_j_particles[i].j]
&& (md->chargeA[mm_j_particles[i].j]
|| (md->chargeB && md->chargeB[mm_j_particles[i].j]))) {
mm_j_particles[mm_nr_new++] = mm_j_particles[i];
}
}
}
mm_nr = mm_nr_new;
/* store the data retrieved above into the QMMMrec
*/
k=0;
/* Keep the compiler happy,
* shift will always be set in the loop for i=0
*/
shift = 0;
for(i=0;i<qm->nrQMatoms;i++){
/* not all qm particles might have appeared as i
* particles. They might have been part of the same charge
* group for instance.
*/
if (qm->indexQM[i] == qm_i_particles[k].j) {
shift = qm_i_particles[k++].shift;
}
/* use previous shift, assuming they belong the same charge
* group anyway,
*/
qm->shiftQM[i] = shift;
}
}
/* parallel excecution */
if(PAR(cr)){
snew(parallelMMarray,2*(md->nr));
/* only MM particles have a 1 at their atomnumber. The second part
* of the array contains the shifts. Thus:
* p[i]=1/0 depending on wether atomnumber i is a MM particle in the QM
* step or not. p[i+md->nr] is the shift of atomnumber i.
*/
for(i=0;i<2*(md->nr);i++){
parallelMMarray[i]=0;
}
for(i=0;i<mm_nr;i++){
parallelMMarray[mm_j_particles[i].j]=1;
parallelMMarray[mm_j_particles[i].j+(md->nr)]=mm_j_particles[i].shift;
}
gmx_sumi(md->nr,parallelMMarray,cr);
mm_nr=0;
mm_max = 0;
for(i=0;i<md->nr;i++){
if(parallelMMarray[i]){
if(mm_nr >= mm_max){
mm_max += 1000;
srenew(mm->indexMM,mm_max);
srenew(mm->shiftMM,mm_max);
}
mm->indexMM[mm_nr] = i;
mm->shiftMM[mm_nr++]= parallelMMarray[i+md->nr]/parallelMMarray[i];
}
}
mm->nrMMatoms=mm_nr;
free(parallelMMarray);
}
/* serial execution */
else{
mm->nrMMatoms = mm_nr;
srenew(mm->shiftMM,mm_nr);
srenew(mm->indexMM,mm_nr);
for(i=0;i<mm_nr;i++){
mm->indexMM[i]=mm_j_particles[i].j;
mm->shiftMM[i]=mm_j_particles[i].shift;
}
}
/* (re) allocate memory for the MM coordiate array. The QM
* coordinate array was already allocated in init_QMMM, and is
* only (re)filled in the update_QMMM_coordinates routine
*/
srenew(mm->xMM,mm->nrMMatoms);
/* now we (re) fill the array that contains the MM charges with
* the forcefield charges. If requested, these charges will be
* scaled by a factor
*/
srenew(mm->MMcharges,mm->nrMMatoms);
for(i=0;i<mm->nrMMatoms;i++){/* no free energy yet */
mm->MMcharges[i]=md->chargeA[mm->indexMM[i]]*mm->scalefactor;
}
if(qm->bTS||qm->bOPT){
/* store (copy) the c6 and c12 parameters into the MMrec struct
*/
srenew(mm->c6,mm->nrMMatoms);
srenew(mm->c12,mm->nrMMatoms);
for (i=0;i<mm->nrMMatoms;i++){
mm->c6[i] = C6(fr->nbfp,top->idef.atnr,
md->typeA[mm->indexMM[i]],
md->typeA[mm->indexMM[i]])/c6au;
mm->c12[i] =C12(fr->nbfp,top->idef.atnr,
md->typeA[mm->indexMM[i]],
md->typeA[mm->indexMM[i]])/c12au;
}
punch_QMMM_excl(qr->qm[0],mm,&(top->excls));
}
/* the next routine fills the coordinate fields in the QMMM rec of
* both the qunatum atoms and the MM atoms, using the shifts
* calculated above.
*/
update_QMMM_coord(x,fr,qr->qm[0],qr->mm);
free(qm_i_particles);
free(mm_j_particles);
}
else { /* ONIOM */ /* ????? */
mm->nrMMatoms=0;
/* do for each layer */
for (j=0;j<qr->nrQMlayers;j++){
qm = qr->qm[j];
qm->shiftQM[0]=XYZ2IS(0,0,0);
for(i=1;i<qm->nrQMatoms;i++){
qm->shiftQM[i] = pbc_dx_aiuc(&pbc,x[qm->indexQM[0]],x[qm->indexQM[i]],
dx);
}
update_QMMM_coord(x,fr,qm,mm);
}
}
} /* update_QMMM_rec */