test: inherit JOBS from environment

In some virtualized environments the amount of available resources are misleading; for instance `multiprocessing.cpu_count()` on our current 4-core smartos vm's returns `48`. This is not a bug, merely how the vm host provides information about available hardware. Avoid running into issues by overriding `cpu_count()` with `JOBS`. PR-URL: nodejs#4495 Reviewed-By: Brian White <[email protected]>
scovetta · Apr 2, 2016 · ba7df9d · ba7df9d
1 parent 69d94bd
commit ba7df9d
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/tools/test.py b/tools/test.py
@@ -1339,7 +1339,10 @@ def ProcessOptions(options):
       print "The test group to run (n) must be smaller than number of groups (m)."
       return False
   if options.J:
-    options.j = multiprocessing.cpu_count()
+    # inherit JOBS from environment if provided. some virtualised systems
+    # tends to exaggerate the number of available cpus/cores.
+    cores = os.environ.get('JOBS')
+    options.j = int(cores) if cores is not None else multiprocessing.cpu_count()
   if options.flaky_tests not in ["run", "skip", "dontcare"]:
     print "Unknown flaky-tests mode %s" % options.flaky_tests
     return False