Skip to content

Don't call MPI_Comm_split if NCCL_TESTS_SPLIT_MASK is not set #151

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Don't call MPI_Comm_split if NCCL_TESTS_SPLIT_MASK is not set #151

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 11 additions & 6 deletions src/common.cu
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -860,13 +860,18 @@ testResult_t run() {
if (hostHashs[p] == hostHashs[proc]) localRank++;
}

MPI_Comm mpi_comm = MPI_COMM_WORLD;
char* str = getenv("NCCL_TESTS_SPLIT_MASK");
uint64_t mask = str ? strtoul(str, NULL, 16) : 0;
MPI_Comm mpi_comm;
color = proc & mask;
MPI_Comm_split(MPI_COMM_WORLD, color, proc, &mpi_comm);
MPI_Comm_size(mpi_comm, &ncclProcs);
MPI_Comm_rank(mpi_comm, &ncclProc);
if (str) {
uint64_t mask = strtoul(str, NULL, 16);
color = proc & mask;
MPI_Comm_split(MPI_COMM_WORLD, color, proc, &mpi_comm);
MPI_Comm_size(mpi_comm, &ncclProcs);
MPI_Comm_rank(mpi_comm, &ncclProc);
} else {
ncclProcs = totalProcs;
ncclProc = proc;
}
#endif
is_main_thread = is_main_proc = (proc == 0) ? 1 : 0;

Expand Down