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lal_lj_coul_msm.cpp
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Tue, Nov 5, 16:23

lal_lj_coul_msm.cpp
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/***************************************************************************
lj_coul_msm.cpp
-------------------
Trung Dac Nguyen (ORNL)
Class for acceleration of the lj/cut/coul/msm pair style.
__________________________________________________________________________
This file is part of the LAMMPS Accelerator Library (LAMMPS_AL)
__________________________________________________________________________
begin :
email : brownw@ornl.gov
***************************************************************************/
#if defined(USE_OPENCL)
#include "lj_coul_msm_cl.h"
#elif defined(USE_CUDART)
const char *lj_coul_msm=0;
#else
#include "lj_coul_msm_cubin.h"
#endif
#include "lal_lj_coul_msm.h"
#include <cassert>
using namespace LAMMPS_AL;
#define LJCoulMSMT LJCoulMSM<numtyp, acctyp>
extern Device<PRECISION,ACC_PRECISION> device;
template <class numtyp, class acctyp>
LJCoulMSMT::LJCoulMSM() : BaseCharge<numtyp,acctyp>(),
_allocated(false) {
}
template <class numtyp, class acctyp>
LJCoulMSMT::~LJCoulMSM() {
clear();
}
template <class numtyp, class acctyp>
int LJCoulMSMT::bytes_per_atom(const int max_nbors) const {
return this->bytes_per_atom_atomic(max_nbors);
}
template <class numtyp, class acctyp>
int LJCoulMSMT::init(const int ntypes,
double **host_cutsq, double **host_lj1,
double **host_lj2, double **host_lj3,
double **host_lj4, double **host_gcons,
double **host_dgcons, double **host_offset,
double *host_special_lj, const int nlocal,
const int nall, const int max_nbors,
const int maxspecial, const double cell_size,
const double gpu_split, FILE *_screen,
double **host_cut_ljsq, const double host_cut_coulsq,
double *host_special_coul, const int order,
const double qqrd2e) {
int success;
success=this->init_atomic(nlocal,nall,max_nbors,maxspecial,cell_size,gpu_split,
_screen,lj_coul_msm,"k_lj_coul_msm");
if (success!=0)
return success;
// If atom type constants fit in shared memory use fast kernel
int lj_types=ntypes;
shared_types=false;
int max_shared_types=this->device->max_shared_types();
if (lj_types<=max_shared_types && this->_block_size>=max_shared_types) {
lj_types=max_shared_types;
shared_types=true;
}
_lj_types=lj_types;
// Allocate a host write buffer for data initialization
UCL_H_Vec<numtyp> host_write(lj_types*lj_types*32,*(this->ucl_device),
UCL_WRITE_ONLY);
for (int i=0; i<lj_types*lj_types; i++)
host_write[i]=0.0;
lj1.alloc(lj_types*lj_types,*(this->ucl_device),UCL_READ_ONLY);
this->atom->type_pack4(ntypes,lj_types,lj1,host_write,host_lj1,host_lj2,
host_cutsq, host_cut_ljsq);
lj3.alloc(lj_types*lj_types,*(this->ucl_device),UCL_READ_ONLY);
this->atom->type_pack4(ntypes,lj_types,lj3,host_write,host_lj3,host_lj4,
host_offset);
// pack gcons and dgcons
int nrows, ncols;
nrows = 7;
ncols = 7;
UCL_H_Vec<numtyp> dview_gcons(nrows*ncols,*(this->ucl_device),
UCL_WRITE_ONLY);
for (int ix=0; ix<nrows; ix++)
for (int iy=0; iy<ncols; iy++)
dview_gcons[ix*ncols+iy]=host_gcons[ix][iy];
gcons.alloc(nrows*ncols,*(this->ucl_device),UCL_READ_ONLY);
ucl_copy(gcons,dview_gcons,false);
gcons_tex.get_texture(*(this->pair_program),"gcons_tex");
gcons_tex.bind_float(gcons,1);
nrows = 7;
ncols = 6;
UCL_H_Vec<numtyp> dview_dgcons(nrows*ncols,*(this->ucl_device),
UCL_WRITE_ONLY);
for (int ix=0; ix<nrows; ix++)
for (int iy=0; iy<ncols; iy++)
dview_dgcons[ix*ncols+iy]=host_dgcons[ix][iy];
dgcons.alloc(nrows*ncols,*(this->ucl_device),UCL_READ_ONLY);
ucl_copy(dgcons,dview_dgcons,false);
dgcons_tex.get_texture(*(this->pair_program),"dgcons_tex");
dgcons_tex.bind_float(dgcons,1);
sp_lj.alloc(8,*(this->ucl_device),UCL_READ_ONLY);
for (int i=0; i<4; i++) {
host_write[i]=host_special_lj[i];
host_write[i+4]=host_special_coul[i];
}
ucl_copy(sp_lj,host_write,8,false);
_cut_coulsq=host_cut_coulsq;
_qqrd2e=qqrd2e;
_order=order;
_allocated=true;
this->_max_bytes=lj1.row_bytes()+lj3.row_bytes()+
gcons.row_bytes()+dgcons.row_bytes()+sp_lj.row_bytes();
return 0;
}
template <class numtyp, class acctyp>
void LJCoulMSMT::clear() {
if (!_allocated)
return;
_allocated=false;
lj1.clear();
lj3.clear();
gcons.clear();
dgcons.clear();
sp_lj.clear();
this->clear_atomic();
}
template <class numtyp, class acctyp>
double LJCoulMSMT::host_memory_usage() const {
return this->host_memory_usage_atomic()+sizeof(LJCoulMSM<numtyp,acctyp>);
}
// ---------------------------------------------------------------------------
// Calculate energies, forces, and torques
// ---------------------------------------------------------------------------
template <class numtyp, class acctyp>
void LJCoulMSMT::loop(const bool _eflag, const bool _vflag) {
// Compute the block size and grid size to keep all cores busy
const int BX=this->block_size();
int eflag, vflag;
if (_eflag)
eflag=1;
else
eflag=0;
if (_vflag)
vflag=1;
else
vflag=0;
int GX=static_cast<int>(ceil(static_cast<double>(this->ans->inum())/
(BX/this->_threads_per_atom)));
int ainum=this->ans->inum();
int nbor_pitch=this->nbor->nbor_pitch();
this->time_pair.start();
if (shared_types) {
this->k_pair_fast.set_size(GX,BX);
this->k_pair_fast.run(&this->atom->x, &lj1, &lj3, &gcons, &dgcons, &sp_lj,
&this->nbor->dev_nbor, &this->_nbor_data->begin(),
&this->ans->force, &this->ans->engv, &eflag,
&vflag, &ainum, &nbor_pitch, &this->atom->q,
&_cut_coulsq, &_qqrd2e, &_order,
&this->_threads_per_atom);
} else {
this->k_pair.set_size(GX,BX);
this->k_pair.run(&this->atom->x, &lj1, &lj3, &gcons, &dgcons,
&_lj_types, &sp_lj, &this->nbor->dev_nbor,
&this->_nbor_data->begin(), &this->ans->force,
&this->ans->engv, &eflag, &vflag, &ainum,
&nbor_pitch, &this->atom->q, &_cut_coulsq,
&_qqrd2e, &_order, &this->_threads_per_atom);
}
this->time_pair.stop();
}
template class LJCoulMSM<PRECISION,ACC_PRECISION>;

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