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Save some code for static huge tlb's. It is ifdef'ed out but an interesting root only experiment.

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No gain from it.
This commit is contained in:
paboyle 2017-03-21 22:30:29 -04:00
parent 8c8473998d
commit fc93f0b2ec
1 changed files with 47 additions and 1 deletions
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48
lib/communicator/Communicator_mpi3.cc
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@ -33,8 +33,14 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/mman.h>
//#include <zlib.h>
#ifndef SHM_HUGETLB
#define SHM_HUGETLB 04000
#endif
namespace Grid {
@ -189,8 +195,9 @@ void CartesianCommunicator::Init(int *argc, char ***argv) {
ShmCommBuf = 0;
ShmCommBufs.resize(ShmSize);
char shm_name [NAME_MAX];
#if 1
char shm_name [NAME_MAX];
if ( ShmRank == 0 ) {
for(int r=0;r<ShmSize;r++){
@ -228,6 +235,44 @@ void CartesianCommunicator::Init(int *argc, char ***argv) {
ShmCommBufs[r] =ptr;
}
}
#else
std::vector<int> shmids(ShmSize);
if ( ShmRank == 0 ) {
for(int r=0;r<ShmSize;r++){
size_t size = CartesianCommunicator::MAX_MPI_SHM_BYTES;
key_t key = 0x4545 + r;
if ((shmids[r]= shmget(key,size, SHM_HUGETLB | IPC_CREAT | SHM_R | SHM_W)) < 0) {
int errsv = errno;
printf("Errno %d\n",errsv);
perror("shmget");
exit(1);
}
printf("shmid: 0x%x\n", shmids[r]);
}
}
MPI_Barrier(ShmComm);
MPI_Bcast(&shmids[0],ShmSize*sizeof(int),MPI_BYTE,0,ShmComm);
MPI_Barrier(ShmComm);
for(int r=0;r<ShmSize;r++){
ShmCommBufs[r] = (uint64_t *)shmat(shmids[r], NULL,0);
if (ShmCommBufs[r] == (uint64_t *)-1) {
perror("Shared memory attach failure");
shmctl(shmids[r], IPC_RMID, NULL);
exit(2);
}
printf("shmaddr: %p\n", ShmCommBufs[r]);
}
MPI_Barrier(ShmComm);
// Mark for clean up
for(int r=0;r<ShmSize;r++){
shmctl(shmids[r], IPC_RMID,(struct shmid_ds *)NULL);
}
MPI_Barrier(ShmComm);
#endif
ShmCommBuf = ShmCommBufs[ShmRank];
MPI_Barrier(ShmComm);
@ -239,6 +284,7 @@ void CartesianCommunicator::Init(int *argc, char ***argv) {
check[2] = 0x5A5A5A;
}
}
MPI_Barrier(ShmComm);
for(int r=0;r<ShmSize;r++){
uint64_t * check = (uint64_t *) ShmCommBufs[r];