10000 DOC: site.cfg: warn against OpenBLAS and multiprocessing by larsmans · Pull Request #4194 · numpy/numpy · GitHub
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DOC: site.cfg: warn against OpenBLAS and multiprocessing #4194

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Jan 14, 2014
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DOC: site.cfg: warn against OpenBLAS and multiprocessing #4194

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11 changes: 11 additions & 0 deletions site.cfg.example
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Expand Up @@ -83,6 +83,17 @@
# for your configuration (in the following example we installed OpenBLAS with
# ``make install PREFIX=/opt/OpenBLAS``.
#
# **Warning**: OpenBLAS, by default, is built in multithreaded mode. Due to the
# way Python's multiprocessing is implemented, a multithreaded OpenBLAS can
# cause programs using both to hang as soon as a worker process is forked on
# POSIX systems (Linux, Mac). Python 3.4 will introduce a new feature in
# multiprocessing, called the "forkserver", which solves this problem. For
# older versions, either compile OpenBLAS with multithreading turned off or
# use Python threads instead of multiprocessing.
# (This problem does not exist with multithreaded ATLAS.)
#
# http://docs.python.org/3.4/library/multiprocessing.html#contexts-and-start-methods
#
# [openblas]
# libraries = openblas
# library_dirs = /opt/OpenBLAS/lib
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