Enable sharding of individual testsuites in tools/test.py...

tools/test.py

 #!/usr/bin/env python
 #
 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 1163 matching lines @@
       dest="store_unexpected_output", action="store_false")
   result.add_option("--stress-only",
                     help="Only run tests with --always-opt --stress-opt",
                     default=False, action="store_true")
   result.add_option("--nostress",
                     help="Don't run crankshaft --always-opt --stress-op test",
                     default=False, action="store_true")
   result.add_option("--crankshaft",
                     help="Run with the --crankshaft flag",
                     default=False, action="store_true")
+  result.add_option("--shard-count",
+                    help="Split testsuites into this number of shards",
+                    default=1, type="int")
+  result.add_option("--shard-run",
+                    help="Run this shard from the split up tests.",
+                    default=1, type="int")
   result.add_option("--noprof", help="Disable profiling support",
                     default=False)
   return result
 
 
 def ProcessOptions(options):
   global VERBOSE
   VERBOSE = options.verbose
   options.mode = options.mode.split(',')
   for mode in options.mode:
@@ skipping 101 matching lines @@
 def GetSuites(test_root):
   def IsSuite(path):
     return isdir(path) and exists(join(path, 'testcfg.py'))
   return [ f for f in os.listdir(test_root) if IsSuite(join(test_root, f)) ]
 
 
 def FormatTime(d):
   millis = round(d * 1000) % 1000
   return time.strftime("%M:%S.", time.gmtime(d)) + ("%03i" % millis)
 
+def ShardTests(tests, options):
+  if options.shard_count < 2:
+    return tests
+  if options.shard_run < 1 or options.shard_run > options.shard_count:
+    print "shard-run not a valid number, should be in [1:shard-count]"
+    print "defaulting back to running all tests"
+    return tests
+  count = 0;
+  shard = []
+  for test in tests:
+    if count % options.shard_count == options.shard_run - 1:
+      shard.append(test);
+    count += 1
+  return shard
 
 def Main():
   parser = BuildOptions()
   (options, args) = parser.parse_args()
   if not ProcessOptions(options):
     parser.print_help()
     return 1
 
   workspace = abspath(join(dirname(sys.argv[0]), '..'))
   suites = GetSuites(join(workspace, 'test'))
@@ skipping 63 matching lines @@
         'simulator': options.simulator,
         'crankshaft': options.crankshaft
       }
       test_list = root.ListTests([], path, context, mode)
       unclassified_tests += test_list
       (cases, unused_rules, all_outcomes) = config.ClassifyTests(test_list, env)
       if globally_unused_rules is None:
         globally_unused_rules = set(unused_rules)
       else:
         globally_unused_rules = globally_unused_rules.intersection(unused_rules)
-      all_cases += cases
+      all_cases += ShardTests(cases, options)
       all_unused.append(unused_rules)
 
   if options.cat:
     visited = set()
     for test in unclassified_tests:
       key = tuple(test.path)
       if key in visited:
         continue
       visited.add(key)
       print "--- begin source: %s ---" % test.GetLabel()
@@ skipping 39 matching lines @@
     for entry in timed_tests[:20]:
       t = FormatTime(entry.duration)
       sys.stderr.write("%4i (%s) %s\n" % (index, t, entry.GetLabel()))
       index += 1
 
   return result
 
 
 if __name__ == '__main__':
   sys.exit(Main())