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atom_vec_charge_cuda.cpp
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Fri, Nov 8, 22:17

atom_vec_charge_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.
-----------------------------------------------------------------------
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.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include "atom_vec_charge_cuda.h"
#include "comm_cuda_cu.h"
#include "atom_vec_charge_cuda_cu.h"
#include "atom.h"
#include "domain.h"
#include "modify.h"
#include "fix.h"
#include "memory.h"
#include "error.h"
#include "user_cuda.h"
#include "comm.h"
using namespace LAMMPS_NS;
#define BUFFACTOR 1.5
#define BUFEXTRA 1000
#define NCUDAEXCHANGE 12 //nextra x y z vx vy vz tag type mask image q
#define BUF_CFLOAT double
/* ---------------------------------------------------------------------- */
AtomVecChargeCuda::AtomVecChargeCuda(LAMMPS *lmp) : AtomVecCharge(lmp)
{
cuda = lmp->cuda;
if(cuda == NULL)
error->all(FLERR,"You cannot use a /cuda class, without activating 'cuda' acceleration. Provide '-c on' as command-line argument to LAMMPS..");
maxsend=0;
cudable=true;
cuda_init_done=false;
max_nsend=0;
cu_copylist=NULL;
copylist=NULL;
copylist2=NULL;
}
void AtomVecChargeCuda::grow_copylist(int new_max_nsend)
{
max_nsend=new_max_nsend;
delete cu_copylist;
delete [] copylist2;
if(copylist) CudaWrapper_FreePinnedHostData((void*) copylist);
copylist = (int*) CudaWrapper_AllocPinnedHostData(max_nsend*sizeof(int),false);
copylist2 = new int[max_nsend];
cu_copylist = new cCudaData<int, int, xx > (copylist, max_nsend);
}
void AtomVecChargeCuda::grow_send(int n,double** buf_send,int flag) //need to be able to grow the comm send_buffer since the array sahll be copied from the gpu in whole
{
int old_maxsend=*maxsend+BUFEXTRA;
*maxsend = static_cast<int> (BUFFACTOR * n);
if (flag)
{
if(cuda->pinned)
{
double* tmp = new double[old_maxsend];
memcpy((void*) tmp,(void*) *buf_send,old_maxsend*sizeof(double));
if(*buf_send) CudaWrapper_FreePinnedHostData((void*) (*buf_send));
*buf_send = (double*) CudaWrapper_AllocPinnedHostData((*maxsend+BUFEXTRA)*sizeof(double),false);
memcpy(*buf_send,tmp,old_maxsend*sizeof(double));
delete [] tmp;
}
else
{
*buf_send = (double *)
memory->srealloc(*buf_send,(*maxsend+BUFEXTRA)*sizeof(double),
"comm:buf_send");
}
}
else {
if(cuda->pinned)
{
if(*buf_send) CudaWrapper_FreePinnedHostData((void*) (*buf_send));
*buf_send = (double*) CudaWrapper_AllocPinnedHostData((*maxsend+BUFEXTRA)*sizeof(double),false);
}
else
{
memory->sfree(*buf_send);
*buf_send = (double *) memory->smalloc((*maxsend+BUFEXTRA)*sizeof(double),
"comm:buf_send");
}
}
}
void AtomVecChargeCuda::grow_both(int n)
{
if(cuda->finished_setup)
cuda->downloadAll();
AtomVecCharge::grow(n);
if(cuda->finished_setup)
{
cuda->checkResize();
cuda->uploadAll();
}
}
int AtomVecChargeCuda::pack_comm(int n, int* iswap, double *buf,
int pbc_flag, int *pbc) //usually this should not be called since comm->communicate handles the communication if only positions are exchanged
{
if(not cuda->finished_setup || cuda->oncpu)
return AtomVecCharge::pack_comm(n,iswap,buf,pbc_flag,pbc);
int m = Cuda_CommCuda_PackComm(&cuda->shared_data,n,*iswap,(void*) buf,pbc,pbc_flag);
if((sizeof(X_CFLOAT)!=sizeof(double)) && m)
m=(m+1)*sizeof(X_CFLOAT)/sizeof(double);
return m;
}
int AtomVecChargeCuda::pack_comm_vel(int n, int* iswap, double *buf,
int pbc_flag, int *pbc) //usually this should not be called since comm->communicate handles the communication if only positions are exchanged
{
if(not cuda->finished_setup || cuda->oncpu)
return AtomVecCharge::pack_comm_vel(n,iswap,buf,pbc_flag,pbc);
int m = Cuda_CommCuda_PackCommVel(&cuda->shared_data,n,*iswap,(void*) buf,pbc,pbc_flag);
if((sizeof(X_CFLOAT)!=sizeof(double)) && m)
m=(m+1)*sizeof(X_CFLOAT)/sizeof(double);
return m;
}
/* ---------------------------------------------------------------------- */
void AtomVecChargeCuda::unpack_comm(int n, int first, double *buf) //usually this should not be called since comm->communicate handles the communication if only positions are exchanged
{
if(not cuda->finished_setup || cuda->oncpu)
{AtomVecCharge::unpack_comm(n,first,buf); return;}
Cuda_CommCuda_UnpackComm(&cuda->shared_data,n,first,(void*)buf);
}
void AtomVecChargeCuda::unpack_comm_vel(int n, int first, double *buf) //usually this should not be called since comm->communicate handles the communication if only positions are exchanged
{
if(not cuda->finished_setup || cuda->oncpu)
{AtomVecCharge::unpack_comm_vel(n,first,buf); return;}
Cuda_CommCuda_UnpackCommVel(&cuda->shared_data,n,first,(void*)buf);
}
/* ---------------------------------------------------------------------- */
int AtomVecChargeCuda::pack_reverse(int n, int first, double *buf) //usually this should not be called since comm->communicate handles the communication if only forces are exchanged
{
if(not cuda->finished_setup || cuda->oncpu)
return AtomVecCharge::pack_reverse(n,first,buf);
int i,m,last;
cuda->cu_f->download();
m = 0;
last = first + n;
for (i = first; i < last; i++) {
buf[m++] = f[i][0];
buf[m++] = f[i][1];
buf[m++] = f[i][2];
}
cuda->cu_f->upload();
return m;
}
/* ---------------------------------------------------------------------- */
void AtomVecChargeCuda::unpack_reverse(int n, int *list, double *buf)//usually this should not be called since comm->communicate handles the communication if only forces are exchanged
{
if(not cuda->finished_setup || cuda->oncpu)
{AtomVecCharge::unpack_reverse(n,list,buf); return;}
int i,j,m;
m = 0;
cuda->cu_f->download();
for (i = 0; i < n; i++) {
j = list[i];
f[j][0] += buf[m++];
f[j][1] += buf[m++];
f[j][2] += buf[m++];
}
cuda->cu_f->upload();
}
/* ---------------------------------------------------------------------- */
int AtomVecChargeCuda::pack_border(int n, int *iswap, double *buf,
int pbc_flag, int *pbc)
{
if(not cuda->finished_setup || cuda->oncpu)
return AtomVecCharge::pack_border(n,iswap,buf,pbc_flag,pbc);
int m = Cuda_AtomVecChargeCuda_PackBorder(&cuda->shared_data,n,*iswap,(void*) buf,pbc,pbc_flag);
return m;
}
int AtomVecChargeCuda::pack_border_vel(int n, int *iswap, double *buf,
int pbc_flag, int *pbc)
{
if(not cuda->finished_setup || cuda->oncpu)
return AtomVecCharge::pack_border_vel(n,iswap,buf,pbc_flag,pbc);
int m = Cuda_AtomVecChargeCuda_PackBorderVel(&cuda->shared_data,n,*iswap,(void*) buf,pbc,pbc_flag);
return m;
}
/* ---------------------------------------------------------------------- */
void AtomVecChargeCuda::unpack_border(int n, int first, double *buf)
{
if(not cuda->finished_setup || cuda->oncpu)
{AtomVecCharge::unpack_border(n,first,buf); return;}
while(atom->nghost+atom->nlocal+n>=cuda->shared_data.atom.nmax) //ensure there is enough space on device to unpack data
{
grow_both(0);
}
int flag=Cuda_AtomVecChargeCuda_UnpackBorder(&cuda->shared_data,n,first,(void*)buf);
if(flag) {printf(" # CUDA: Error: Failed to unpack Border atoms (This might be a bug).\n");}
}
void AtomVecChargeCuda::unpack_border_vel(int n, int first, double *buf)
{
if(not cuda->finished_setup || cuda->oncpu)
{AtomVecCharge::unpack_border_vel(n,first,buf); return;}
while(atom->nghost+atom->nlocal+n>=cuda->shared_data.atom.nmax) //ensure there is enough space on device to unpack data
{
grow_both(0);
}
int flag=Cuda_AtomVecChargeCuda_UnpackBorderVel(&cuda->shared_data,n,first,(void*)buf);
if(flag) {printf(" # CUDA: Error: Failed to unpack Border atoms (This might be a bug).\n");}
}
/* ----------------------------------------------------------------------
pack data for atom I for sending to another proc
xyz must be 1st 3 values, so comm::exchange() can test on them
------------------------------------------------------------------------- */
int AtomVecChargeCuda::pack_exchange(int dim, double *buf)
{
if(cuda->oncpu)
return AtomVecCharge::pack_exchange(dim,buf);
if(not cuda_init_done||domain->box_change)
{
Cuda_AtomVecChargeCuda_Init(&cuda->shared_data);
cuda_init_done=true;
}
double** buf_pointer=(double**) buf;
if(*maxsend<atom->nghost || *buf_pointer==NULL)
{
grow_send(atom->nghost>*maxsend?atom->nghost:*maxsend,buf_pointer,0);
*maxsend=atom->nghost>*maxsend?atom->nghost:*maxsend;
}
if(max_nsend==0) grow_copylist(200);
int nsend_atoms = Cuda_AtomVecChargeCuda_PackExchangeList(&cuda->shared_data,*maxsend,dim,*buf_pointer);
if(nsend_atoms>max_nsend) grow_copylist(nsend_atoms+100);
if(nsend_atoms*NCUDAEXCHANGE>*maxsend)
{
grow_send((int) (nsend_atoms+100)*NCUDAEXCHANGE,buf_pointer,0);
Cuda_AtomVecChargeCuda_PackExchangeList(&cuda->shared_data,*maxsend,dim,*buf_pointer);
}
int nlocal=atom->nlocal-nsend_atoms;
for(int i=0;i<nsend_atoms;i++) copylist2[i]=1;
for(int j=1;j<nsend_atoms+1;j++)
{
int i = static_cast <int> ((*buf_pointer)[j]);
if(i>=nlocal) copylist2[i-nlocal]=-1;
}
int actpos=0;
for(int j=1;j<nsend_atoms+1;j++)
{
int i = static_cast <int> ((*buf_pointer)[j]);
if(i<nlocal)
{
while(copylist2[actpos]==-1) actpos++;
copylist[j-1]=nlocal+actpos;
actpos++;
}
}
cu_copylist->upload();
cuda->shared_data.atom.nlocal=nlocal;
int m = Cuda_AtomVecChargeCuda_PackExchange(&cuda->shared_data,nsend_atoms,*buf_pointer,cu_copylist->dev_data());
if (atom->nextra_grow)
for(int j=0;j<nsend_atoms;j++)
{
int i=static_cast <int> ((*buf_pointer)[j+1]);
int nextra=0;
for (int iextra = 0; iextra < atom->nextra_grow; iextra++) {
int dm = modify->fix[atom->extra_grow[iextra]]->pack_exchange(i,&((*buf_pointer)[m]));
m+=dm;
nextra+=dm;
if(i<nlocal)modify->fix[atom->extra_grow[iextra]]->copy_arrays(copylist[j],i,1);
if(m>*maxsend) grow_send(m,buf_pointer,1);
}
(*buf_pointer)[j+1] = nextra;
}
(*buf_pointer)[0] = nsend_atoms;
atom->nlocal-=nsend_atoms;
cuda->shared_data.atom.update_nlocal=2;
if(m==1) return 0;//m is at least 1 in cuda since buf[0] contains number of atoms
return m;
}
/* ---------------------------------------------------------------------- */
int AtomVecChargeCuda::unpack_exchange(double *buf)
{
if(cuda->oncpu)
return AtomVecCharge::unpack_exchange(buf);
int dim=cuda->shared_data.exchange_dim;
if(domain->box_change)
Cuda_AtomVecChargeCuda_Init(&cuda->shared_data);
int mfirst=0;
for(int pi=0;pi<(comm->procgrid[dim]>2?2:1);pi++)
{
int nlocal = atom->nlocal;
int nsend_atoms=static_cast<int> (buf[0]);
if(nsend_atoms>max_nsend) grow_copylist(nsend_atoms+100);
if (nlocal+nsend_atoms+atom->nghost>=atom->nmax) grow_both(nlocal+nsend_atoms*2+atom->nghost);
int naccept = Cuda_AtomVecChargeCuda_UnpackExchange(&cuda->shared_data,nsend_atoms,buf,cu_copylist->dev_data());
cu_copylist->download();
int m = nsend_atoms*NCUDAEXCHANGE + 1;
nlocal+=naccept;
if (atom->nextra_grow)
for(int j=0;j<nsend_atoms;j++)
{
if(copylist[j]>-1)
{
for (int iextra = 0; iextra < atom->nextra_grow; iextra++)
m += modify->fix[atom->extra_grow[iextra]]->
unpack_exchange(copylist[j],&buf[m]);
}
else
m+=static_cast <int> (buf[j+1]);
}
cuda->shared_data.atom.nlocal=nlocal;
cuda->shared_data.atom.update_nlocal=2;
atom->nlocal=nlocal;
mfirst+=m;
buf=&buf[m];
}
return mfirst;
}

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