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--shm-force-mpi

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This commit is contained in:
Peter Boyle 2020-11-16 20:15:50 -05:00
parent 13df14f96e
commit aa8aba6543
2 changed files with 13 additions and 3 deletions
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5
Grid/communicator/SharedMemoryMPI.cc
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@ -666,7 +666,6 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
#endif
void * ptr = mmap(NULL,size, PROT_READ | PROT_WRITE, mmap_flag, fd, 0);
// std::cout << "Set WorldShmCommBufs["<<r<<"]="<<ptr<< "("<< size<< "bytes)"<<std::endl;
if ( ptr == (void * )MAP_FAILED ) {
perror("failed mmap");
assert(0);
@ -772,13 +771,15 @@ void SharedMemory::SetCommunicator(Grid_MPI_Comm comm)
std::vector<int> ranks(size); for(int r=0;r<size;r++) ranks[r]=r;
MPI_Group_translate_ranks (FullGroup,size,&ranks[0],ShmGroup, &ShmRanks[0]);
#if 0
#ifdef GRID_SHM_FORCE_MPI
// Hide the shared memory path between ranks
{
for(int r=0;r<size;r++){
if ( r!=rank ) {
ShmRanks[r] = MPI_UNDEFINED;
}
}
}
#endif
SharedMemoryTest();

9
configure.ac
View File

@ -550,6 +550,15 @@ AC_ARG_ENABLE([shmpath],[AC_HELP_STRING([--enable-shmpath=path],
[ac_SHMPATH=/var/lib/hugetlbfs/global/pagesize-2MB/])
AC_DEFINE_UNQUOTED([GRID_SHM_PATH],["$ac_SHMPATH"],[Path to a hugetlbfs filesystem for MMAPing])
############### force MPI in SMP
AC_ARG_ENABLE([shm-force-mpi],[AC_HELP_STRING([--enable-shm-force-mpi],
[Force MPI within shared memory])],[ac_SHM_FORCE_MPI=${enable_shm_force_mpi}],[ac_SHM_FORCE_MPI=no])
case ${ac_SHM_FORCE_MPI} in
yes)
AC_DEFINE([GRID_SHM_FORCE_MPI],[1],[GRID_SHM_FORCE_MPI] )
;;
*) ;;
esac
############### communication type selection
AC_ARG_ENABLE([comms-threads],[AC_HELP_STRING([--enable-comms-threads | --disable-comms-threads],