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Set numThreads to 1 by default when Python is older than 2.5.2.

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Python 2.4 always hits this bug: http://bugs.python.org/issue1731717
when running check-lit on multi-core systems.
Setting numThreads to 1 makes it slower, but at least the results reported are
correct.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98969 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin 2010-03-19 17:54:21 +00:00
parent 774ce29399
commit 2f36fe4380
1 changed files with 8 additions and 1 deletions
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9
utils/lit/lit/lit.py
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@ -411,7 +411,14 @@ def main():
gSiteConfigName = '%s.site.cfg' % opts.configPrefix
if opts.numThreads is None:
opts.numThreads = Util.detectCPUs()
# Python <2.5 has a race condition causing lit to always fail with numThreads>1
# http://bugs.python.org/issue1731717
# I haven't seen this bug occur with 2.5.2 and later, so only enable multiple
# threads by default there.
if sys.hexversion >= 0x2050200:
opts.numThreads = Util.detectCPUs()
else:
opts.numThreads = 1
inputs = args