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Change log level for OMP warning (#7114)

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Simon Mo
2020-02-11 14:15:38 -08:00
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parent 2a0e4d94aa
commit 039d2cde88
2 changed files with 11 additions and 3 deletions
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doc/source/configure.rst
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@@ -48,6 +48,14 @@ If using the command line, connect to the Ray cluster as follow:
# Connect to ray. Notice if connected to existing cluster, you don't specify resources.
ray.init(address=<address>)
.. note::
Ray sets the environment variable ``OMP_NUM_THREADS=1`` by default. This is done
to avoid performance degradation with many workers (issue #6998). You can
override this by explicitly setting ``OMP_NUM_THREADS``. ``OMP_NUM_THREADS`` is commonly
used in numpy, PyTorch, and Tensorflow to perform multit-threaded linear algebra.
In multi-worker setting, we want one thread per worker instead of many threads
per worker to avoid contention.
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