lit: Limit number of processes on Windows to 32.

[oota-llvm.git] / utils / lit / lit / util.py

diff --git a/utils/lit/lit/util.py b/utils/lit/lit/util.py
index 224509ab840b610bf773b4f85eca8911f6f97720..36fe8fb9f6915500189c8bcd9e28ef8635d707aa 100644 (file)
--- 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):