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We have a choice of GET or PUT across NVlink

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This commit is contained in:
Peter Boyle 2024-03-25 14:32:44 +00:00
parent 500b119f3d
commit 434c3e7f1d
1 changed files with 12 additions and 0 deletions
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12
Grid/communicator/Communicator_mpi3.cc
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@ -348,6 +348,7 @@ double CartesianCommunicator::StencilSendToRecvFrom( void *xmit,
return offbytes;
}
#undef NVLINK_GET // Define to use get instead of put DMA
double CartesianCommunicator::StencilSendToRecvFromBegin(std::vector<CommsRequest_t> &list,
void *xmit,
int dest,int dox,
@ -380,9 +381,15 @@ double CartesianCommunicator::StencilSendToRecvFromBegin(std::vector<CommsReques
list.push_back(rrq);
off_node_bytes+=rbytes;
}
#ifdef NVLINK_GET
void *shm = (void *) this->ShmBufferTranslate(from,xmit);
assert(shm!=NULL);
acceleratorCopyDeviceToDeviceAsynch(shm,recv,rbytes);
#endif
}
if (dox) {
// rcrc = crc32(rcrc,(unsigned char *)recv,bytes);
if ( (gdest == MPI_UNDEFINED) || Stencil_force_mpi ) {
tag= dir+_processor*32;
ierr =MPI_Isend(xmit, xbytes, MPI_CHAR,dest,tag,communicator_halo[commdir],&xrq);
@ -390,9 +397,12 @@ double CartesianCommunicator::StencilSendToRecvFromBegin(std::vector<CommsReques
list.push_back(xrq);
off_node_bytes+=xbytes;
} else {
#ifndef NVLINK_GET
void *shm = (void *) this->ShmBufferTranslate(dest,recv);
assert(shm!=NULL);
acceleratorCopyDeviceToDeviceAsynch(xmit,shm,xbytes);
#endif
}
}
@ -402,6 +412,8 @@ void CartesianCommunicator::StencilSendToRecvFromComplete(std::vector<CommsReque
{
int nreq=list.size();
acceleratorCopySynchronise();
if (nreq==0) return;
std::vector<MPI_Status> status(nreq);