Update torch.distributed.run OMP_NUM_THREADS message to log.warning (#63953)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63953

Closes #61138

Test:
`python -m torch.distributed.run --nproc_per_node 2 test.py`
Still outputs message

`LOGLEVEL=ERROR python -m torch.distributed.run --nproc_per_node 2 test.py`
Does not output message anymore

cc pietern mrshenli pritamdamania87 zhaojuanmao satgera rohan-varma gqchen aazzolini osalpekar jiayisuse agolynski SciPioneer H-Huang mrzzd cbalioglu gcramer23

Test Plan: Imported from OSS

Reviewed By: malfet

Differential Revision: D30542997

Pulled By: H-Huang

fbshipit-source-id: e7da30dcda51516abf4e56f1f510132e44397027

diff --git a/torch/distributed/run.py b/torch/distributed/run.py
index 9fb88fa..f21fc4e 100644 (file)
--- a/torch/distributed/run.py
+++ b/torch/distributed/run.py
@@ -595,7 +595,7 @@ def config_from_args(args) -> Tuple[LaunchConfig, Union[Callable, str], List[str
     nproc_per_node = determine_local_world_size(args.nproc_per_node)
     if "OMP_NUM_THREADS" not in os.environ and nproc_per_node > 1:
         omp_num_threads = 1
-        print(
+        log.warning(
             f"*****************************************\n"
             f"Setting OMP_NUM_THREADS environment variable for each process to be "
             f"{omp_num_threads} in default, to avoid your system being overloaded, "