From 5579d13f95aab937dbef5b6c0def6d06a121e89c Mon Sep 17 00:00:00 2001
From: Nico Weber <nicolasweber@gmx.de>
Date: Tue, 22 Dec 2015 23:12:00 +0000
Subject: [PATCH] lit: Limit number of processes on Windows to 32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256291 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/lit/lit/util.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/utils/lit/lit/util.py b/utils/lit/lit/util.py
index 224509ab840..36fe8fb9f69 100644
--- a/utils/lit/lit/util.py
+++ b/utils/lit/lit/util.py
@@ -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):
-- 
2.34.1