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BUG: limit default for get_num_build_jobs() to 8 #12190

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charris merged 2 commits into from
Oct 17, 2018
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BUG: limit default for get_num_build_jobs() to 8 #12190

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dec25db
BUG: limit default for get_num_build_jobs() to 8
jdemeyer Oct 5, 2018
88ea62a
DOC: tweak grammar
mattip Oct 8, 2018
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BUG: limit default for get_num_build_jobs() to 8 
The default value for get_num_build_jobs() is now the number of CPUs
limited to a maximum of 8. This is to prevent overloading systems
with a lot of CPUs. See ticket #12087
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@jdemeyer @charris
jdemeyer authored and charris committed Oct 16, 2018
commit dec25db6df3aad7aa8060647fd370a9b1e2010ed
5 changes: 4 additions & 1 deletion numpy/distutils/misc_util.py
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Expand Up @@ -84,7 +84,9 @@ def get_num_build_jobs():
Get number of parallel build jobs set by the --parallel command line
argument of setup.py
If the command did not receive a setting the environment variable
NPY_NUM_BUILD_JOBS checked and if that is unset it returns 1.
NPY_NUM_BUILD_JOBS checked. If that is unset, return the number of
processors on the system, with a maximum of 8 (to prevent
overloading the system if there a lot of CPUs).

Returns
-------
Expand All @@ -97,6 +99,7 @@ def get_num_build_jobs():
cpu_count = len(os.sched_getaffinity(0))
except AttributeError:
cpu_count = multiprocessing.cpu_count()
cpu_count = min(cpu_count, 8)
envjobs = int(os.environ.get("NPY_NUM_BUILD_JOBS", cpu_count))
dist = get_distribution()
# may be None during configuration
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