forked from OSchip/llvm-project
[lit] Bump up the Windows process cap from 32 to 60
At 61 or over, I see messages like File "...\Python\Python39\lib\multiprocessing\connection.py", line 816, in _exhaustive_wait res = _winapi.WaitForMultipleObjects(L, False, timeout) ValueError: need at most 63 handles, got a sequence of length 64 60 seems to work for me. If this causes issues for anybody else, feel free to revert.
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llvm/utils/lit/lit
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@ -120,10 +120,10 @@ def usable_core_count():
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except AttributeError:
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n = os.cpu_count() or 1
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# On Windows, with more than 32 processes, process creation often fails with
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# "Too many open files". FIXME: Check if there's a better fix.
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# On Windows with more than 60 processes, multiprocessing's call to
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# _winapi.WaitForMultipleObjects() prints an error and lit hangs.
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if platform.system() == 'Windows':
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return min(n, 32)
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return min(n, 60)
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return n
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