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[lit] Bump up the Windows process cap from 32 to 60

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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.
This commit is contained in:
Arthur Eubanks 2021-05-07 18:11:21 -07:00
parent 9df931e590
commit 6acb684b54
1 changed files with 3 additions and 3 deletions
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6
utils/lit/lit/util.py
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@ -120,10 +120,10 @@ def usable_core_count():
except AttributeError:
n = os.cpu_count() or 1
# On Windows, with more than 32 processes, process creation often fails with
# "Too many open files". FIXME: Check if there's a better fix.
# On Windows with more than 60 processes, multiprocessing's call to
# _winapi.WaitForMultipleObjects() prints an error and lit hangs.
if platform.system() == 'Windows':
return min(n, 32)
return min(n, 60)
return n