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Fix verbose NVSHMEM_CUMEM_GRANULARITY warning. #115

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Merged
romerojosh merged 1 commit into from
Mar 17, 2026
Merged

Fix verbose NVSHMEM_CUMEM_GRANULARITY warning. #115

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3 changes: 2 additions & 1 deletion src/cudecomp.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -422,11 +422,12 @@ static void checkNvshmemVersion(cudecompHandle_t& handle) {
bool has_signal_bug = (major < 3) || (major == 3 && minor < 2) || (major == 3 && minor == 2 && patch <= 5);
if (has_signal_bug) {
const char* granularity_str = std::getenv("NVSHMEM_CUMEM_GRANULARITY");
if (granularity_str && handle->rank == 0) {
if (granularity_str && std::string(granularity_str) != "2147483648" && handle->rank == 0) {
printf("CUDECOMP:WARN: Overriding NVSHMEM_CUMEM_GRANULARITY (was %s) to 2 GiB to work around "
"a known bug in NVSHMEM %d.%d.%d affecting putmem_signal for inter-group transfers.\n",
granularity_str, major, minor, patch);
}
CHECK_MPI(MPI_Barrier(handle->mpi_comm));
setenv("NVSHMEM_CUMEM_GRANULARITY", "2147483648", 1);
}
}
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