Moved sharding_supervisor

tools/sharding_supervisor/sharding_supervisor.py

 #!/usr/bin/env python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Shards a given test suite and runs the shards in parallel.
 
 ShardingSupervisor is called to process the command line options and creates
 the specified number of worker threads. These threads then run each shard of
 the test in a separate process and report on the results. When all the shards
 have been completed, the supervisor reprints any lines indicating a test
 failure for convenience. If only one shard is to be run, a single subprocess
 is started for that shard and the output is identical to gtest's output.
-
-Usage: python sharding_supervisor.py [options] path/to/test [gtest_args]
 """
 
 
 import optparse
 import os
 import pty
 import Queue
 import subprocess
 import sys
 import threading
 
 
+USAGE = "Usage: python %prog [options] path/to/test [gtest_args]"
 DEFAULT_NUM_CORES = 4
 DEFAULT_SHARDS_PER_CORE = 5 # num_shards = cores * SHARDS_PER_CORE
 DEFAULT_RUNS_PER_CORE = 1 # num_workers = cores * RUNS_PER_CORE
 
 
 def DetectNumCores():
   """Detects the number of cores on the machine.
 
   Returns:
     The number of cores on the machine or DEFAULT_NUM_CORES if it could not
@@ skipping 163 matching lines @@
       if self.color:
         sys.stderr.write("\x1b[0;37m")
       for line in self.failure_log:
         sys.stderr.write(line)
     if self.color:
       sys.stderr.write("\x1b[0;37m")
     return num_failed
 
 
 def main():
-  parser = optparse.OptionParser()
+  parser = optparse.OptionParser(usage=USAGE)
   parser.add_option(
       "-n", "--shards_per_core", type="int", default=DEFAULT_SHARDS_PER_CORE,
       help="number of shards to generate per CPU")
   parser.add_option(
       "-r", "--runs_per_core", type="int", default=DEFAULT_RUNS_PER_CORE,
       help="number of shards to run in parallel per CPU")
   parser.add_option(
       "-c", "--color", action="store_true", default=sys.stdout.isatty(),
       help="force color output, also used by gtest if --gtest_color is not"
       " specified")
@@ skipping 34 matching lines @@
 
   # shard and run the whole test
   ss = ShardingSupervisor(
       args[0], num_shards, num_runs, options.color, gtest_args)
   return ss.ShardTest()
 
 
 if __name__ == "__main__":
   sys.exit(main())