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Set numThreads to 1 by default when Python is older than 2.5.2.
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
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@ -411,7 +411,14 @@ def main():
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gSiteConfigName = '%s.site.cfg' % opts.configPrefix
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if opts.numThreads is None:
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opts.numThreads = Util.detectCPUs()
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# Python <2.5 has a race condition causing lit to always fail with numThreads>1
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# http://bugs.python.org/issue1731717
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# I haven't seen this bug occur with 2.5.2 and later, so only enable multiple
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# threads by default there.
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if sys.hexversion >= 0x2050200:
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opts.numThreads = Util.detectCPUs()
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else:
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opts.numThreads = 1
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inputs = args
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