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pair_lj_cut_coul_long_cuda.cpp
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Thu, Nov 14, 03:39

pair_lj_cut_coul_long_cuda.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
Original Version:
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
See the README file in the top-level LAMMPS directory.
Contributing author: Paul Crozier (SNL)
-----------------------------------------------------------------------
USER-CUDA Package and associated modifications:
https://sourceforge.net/projects/lammpscuda/
Christian Trott, christian.trott@tu-ilmenau.de
Lars Winterfeld, lars.winterfeld@tu-ilmenau.de
Theoretical Physics II, University of Technology Ilmenau, Germany
See the README file in the USER-CUDA directory.
This software is distributed under the GNU General Public License.
------------------------------------------------------------------------- */
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "pair_lj_cut_coul_long_cuda.h"
#include "pair_lj_cut_coul_long_cuda_cu.h"
#include "cuda_data.h"
#include "atom.h"
#include "comm.h"
#include "force.h"
#include "kspace.h"
#include "neighbor.h"
#include "neigh_list.h"
#include "neigh_request.h"
#include "cuda_neigh_list.h"
#include "update.h"
#include "integrate.h"
#include "respa.h"
#include "memory.h"
#include "error.h"
#include "cuda.h"
using namespace LAMMPS_NS;
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define EWALD_F 1.12837917
#define EWALD_P 0.3275911
#define A1 0.254829592
#define A2 -0.284496736
#define A3 1.421413741
#define A4 -1.453152027
#define A5 1.061405429
/* ---------------------------------------------------------------------- */
PairLJCutCoulLongCuda::PairLJCutCoulLongCuda(LAMMPS *lmp) : PairLJCutCoulLong(lmp)
{
cuda = lmp->cuda;
if(cuda == NULL)
error->all("You cannot use a /cuda class, without activating 'cuda' acceleration. Use no '-a' command line argument, or '-a cuda'.");
allocated2 = false;
cuda->shared_data.pair.cudable_force = 1;
cuda->setSystemParams();
}
/* ----------------------------------------------------------------------
remember pointer to arrays in cuda shared data
------------------------------------------------------------------------- */
void PairLJCutCoulLongCuda::allocate()
{
if(! allocated) PairLJCutCoulLong::allocate();
if(! allocated2)
{
allocated2 = true;
cuda->shared_data.pair.cut = cut_lj;
cuda->shared_data.pair.coeff1 = lj1;
cuda->shared_data.pair.coeff2 = lj2;
cuda->shared_data.pair.coeff3 = lj3;
cuda->shared_data.pair.coeff4 = lj4;
cuda->shared_data.pair.offset = offset;
cuda->shared_data.pair.special_lj = force->special_lj;
cuda->shared_data.pair.special_coul = force->special_coul;
}
}
/* ---------------------------------------------------------------------- */
void PairLJCutCoulLongCuda::compute(int eflag, int vflag)
{
if (eflag || vflag) ev_setup(eflag,vflag);
if(eflag) cuda->cu_eng_vdwl->upload();
if(eflag) cuda->cu_eng_coul->upload();
if(vflag) cuda->cu_virial->upload();
Cuda_PairLJCutCoulLongCuda(& cuda->shared_data, & cuda_neigh_list->sneighlist, eflag, vflag, eflag_atom, vflag_atom);
if(not cuda->shared_data.pair.collect_forces_later)
{
if(eflag) cuda->cu_eng_vdwl->download();
if(eflag) cuda->cu_eng_coul->download();
if(vflag) cuda->cu_virial->download();
}
}
/* ---------------------------------------------------------------------- */
void PairLJCutCoulLongCuda::settings(int narg, char **arg)
{
PairLJCutCoulLong::settings(narg, arg);
cuda->shared_data.pair.cut_global = (F_FLOAT) cut_lj_global;
}
/* ---------------------------------------------------------------------- */
void PairLJCutCoulLongCuda::coeff(int narg, char **arg)
{
PairLJCutCoulLong::coeff(narg, arg);
allocate();
}
void PairLJCutCoulLongCuda::init_style()
{
if (!atom->q_flag)
error->all("Pair style lj/cut/coul/long requires atom attribute q");
// request regular or rRESPA neighbor lists
int irequest;
if (update->whichflag == 0 && strcmp(update->integrate_style,"respa") == 0) {
int respa = 0;
if (((Respa *) update->integrate)->level_inner >= 0) respa = 1;
if (((Respa *) update->integrate)->level_middle >= 0) respa = 2;
if (respa == 0) irequest = neighbor->request(this);
else if (respa == 1) {
irequest = neighbor->request(this);
neighbor->requests[irequest]->id = 1;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->respainner = 1;
irequest = neighbor->request(this);
neighbor->requests[irequest]->id = 3;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->respaouter = 1;
} else {
irequest = neighbor->request(this);
neighbor->requests[irequest]->id = 1;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->respainner = 1;
irequest = neighbor->request(this);
neighbor->requests[irequest]->id = 2;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->respamiddle = 1;
irequest = neighbor->request(this);
neighbor->requests[irequest]->id = 3;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->respaouter = 1;
}
}
else
{
irequest = neighbor->request(this);
neighbor->requests[irequest]->full = 1;
neighbor->requests[irequest]->half = 0;
neighbor->requests[irequest]->cudable = 1;
}
cut_coulsq = cut_coul * cut_coul;
cuda->shared_data.pair.cut_coul_global=cut_coul;
cuda->shared_data.pair.cut_coulsq_global=cut_coulsq;
// set rRESPA cutoffs
if (strcmp(update->integrate_style,"respa") == 0 &&
((Respa *) update->integrate)->level_inner >= 0)
cut_respa = ((Respa *) update->integrate)->cutoff;
else cut_respa = NULL;
if (force->newton) error->warning("Pair style uses does not use \"newton\" setting. You might test if \"newton off\" makes the simulation run faster.");
if (force->kspace == NULL)
error->all("Pair style is incompatible with KSpace style");
g_ewald = force->kspace->g_ewald;
cuda->shared_data.pair.g_ewald=g_ewald;
cuda->shared_data.pppm.qqrd2e=force->qqrd2e;
if(ncoultablebits) error->warning("# CUDA: You asked for the useage of Coulomb Tables. This is not supported in CUDA Pair forces. Setting is ignored.\n");
}
void PairLJCutCoulLongCuda::init_list(int id, NeighList *ptr)
{
MYDBG(printf("# CUDA PairLJCutCoulLongCuda::init_list\n");)
PairLJCutCoulLong::init_list(id, ptr);
#ifndef CUDA_USE_BINNING
// right now we can only handle verlet (id 0), not respa
if(id == 0) cuda_neigh_list = cuda->registerNeighborList(ptr);
// see Neighbor::init() for details on lammps lists' logic
#endif
MYDBG(printf("# CUDA PairLJCutCoulLongCuda::init_list end\n");)
}
void PairLJCutCoulLongCuda::ev_setup(int eflag, int vflag)
{
int maxeatomold=maxeatom;
PairLJCutCoulLong::ev_setup(eflag,vflag);
if (eflag_atom && atom->nmax > maxeatomold)
{delete cuda->cu_eatom; cuda->cu_eatom = new cCudaData<double, ENERGY_FLOAT, x > ((double*)eatom, & cuda->shared_data.atom.eatom , atom->nmax );}
if (eflag_atom && atom->nmax > maxeatomold)
{delete cuda->cu_vatom; cuda->cu_vatom = new cCudaData<double, ENERGY_FLOAT, yx > ((double*)vatom, & cuda->shared_data.atom.eatom , atom->nmax, 6 );}
}

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