[llvm] r256291 - lit: Limit number of processes on Windows to 32.

[Nico Weber via llvm-commits]

Author: nico
Date: Tue Dec 22 17:12:00 2015
New Revision: 256291

URL: http://llvm.org/viewvc/llvm-project?rev=256291&view=rev
Log:
lit: Limit number of processes on Windows to 32.

Modified:
    llvm/trunk/utils/lit/lit/util.py

Modified: llvm/trunk/utils/lit/lit/util.py
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/lit/lit/util.py?rev=256291&r1=256290&r2=256291&view=diff
==============================================================================
--- llvm/trunk/utils/lit/lit/util.py (original)
+++ llvm/trunk/utils/lit/lit/util.py Tue Dec 22 17:12:00 2015
@@ -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):