lit: Limit number of processes on Windows to 32.
authorNico Weber <nicolasweber@gmx.de>
Tue, 22 Dec 2015 23:12:00 +0000 (23:12 +0000)
committerNico Weber <nicolasweber@gmx.de>
Tue, 22 Dec 2015 23:12:00 +0000 (23:12 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256291 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/lit/util.py

index 224509a..36fe8fb 100644 (file)
@@ -39,7 +39,9 @@ def detectCPUs():
     if "NUMBER_OF_PROCESSORS" in os.environ:
         ncpus = int(os.environ["NUMBER_OF_PROCESSORS"])
         if ncpus > 0:
-            return ncpus
+            # With more than 32 processes, process creation often fails with
+            # "Too many open files".  FIXME: Check if there's a better fix.
+            return min(ncpus, 32)
     return 1 # Default
 
 def mkdir_p(path):