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distributed_test: Map rank to GPU accordingly #47898

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distributed_test: Map rank to GPU accordingly #47898

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distributed_test: Map rank to GPU accordingly
jaglinux Nov 13, 2020
35d02df
Update torch/testing/_internal/distributed/distributed_test.py
jaglinux Nov 13, 2020
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6 changes: 5 additions & 1 deletion torch/testing/_internal/distributed/distributed_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -364,7 +364,11 @@ def _init_multigpu_helper(self):
if BACKEND == "nccl":
apply_hack_for_nccl()

nGPUs_per_process = nGPUs // world_size
# If rank is lesser than or equal to number of available GPU's
# then each rank can be mapped to corresponding GPU.
nGPUs_per_process = 1
if world_size > nGPUs:
nGPUs_per_process = nGPUs // world_size
rank_to_GPU = {
i: list(
visible_devices[i * nGPUs_per_process: (i + 1) * nGPUs_per_process]
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