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Add barrier before nvshmem_team_split_strided to ensure proper initialization #478

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Add barrier before nvshmem_team_split_strided to ensure proper initialization #478

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4 changes: 3 additions & 1 deletion csrc/kernels/runtime.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,9 @@ int init(const std::vector<uint8_t>& root_unique_id_val, int rank, int num_ranks
nvshmemx_set_attr_uniqueid_args(rank, num_ranks, &root_unique_id, &attr);
nvshmemx_init_attr(NVSHMEMX_INIT_WITH_UNIQUEID, &attr);

// Initialize before nvshmem_team_split_strided
nvshmem_barrier_all();

// Create sub-RDMA teams
// NOTES: if `num_ranks <= NUM_MAX_NVL_PEERS` then only low-latency kernels are used
if (low_latency_mode and num_ranks > NUM_MAX_NVL_PEERS) {
Expand All @@ -68,7 +71,6 @@ int init(const std::vector<uint8_t>& root_unique_id_val, int rank, int num_ranks
EP_HOST_ASSERT(cpu_rdma_team != NVSHMEM_TEAM_INVALID);
}

nvshmem_barrier_all();
return nvshmem_my_pe();
}

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