diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index a1ecb11ef43680f625aa924b8b6b422a8efaacbe..ac49885921aff085730f9a065a1ba6ca14ebe4f3 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -57,7 +57,7 @@ class SimpleConfig(object):
     if environ is None:
       environ = {}
     self.build_config = config
-    self.maxjobs = 100 * multiprocessing.cpu_count()
+    self.maxjobs = 2 * multiprocessing.cpu_count()
     self.allow_hashing = (config != 'gcov')
     self.environ = environ
     self.environ['CONFIG'] = config