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import SCons.Script
import sys
import re
def _cpu_count():
try:
import os
return len(os.sched_getaffinity(0))
except:
pass
try:
import multiprocessing
return multiprocessing.cpu_count()
except:
pass
try:
import os
res = int(os.sysconf('SC_NPROCESSORS_ONLN'))
if res > 0:
return res
except:
pass
try:
import os
res = int(os.environ['NUMBER_OF_PROCESSORS'])
if res > 0:
return res
except:
pass
return 1
def init(env):
for arg in sys.argv:
if re.match(r'^(-j|--jobs=?)\d*$', arg):
return
SCons.Script.SetOption('num_jobs', _cpu_count())
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