Avoid parallel sync in general on arm boards.

gclient.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 37 matching lines @@
         "action":  ["python", "image_indexer.py", "--all"]},
     ]
 """
 
 __version__ = "0.6.4"
 
 import copy
 import logging
 import optparse
 import os
+import platform
 import posixpath
 import pprint
 import re
 import sys
+import urllib
 import urlparse
-import urllib
 
 import breakpad  # pylint: disable=W0611
 
 import fix_encoding
 import gclient_scm
 import gclient_utils
 from third_party.repo.progress import Progress
 import subprocess2
 from third_party import colorama
 # Import shortcut.
@@ skipping 1417 matching lines @@
   # OptParser.description prefer nicely non-formatted strings.
   parser.description = re.sub('[\r\n ]{2,}', ' ', obj.__doc__)
   usage = getattr(obj, 'usage', '')
   parser.set_usage('%%prog %s [options] %s' % (command, usage))
   parser.epilog = getattr(obj, 'epilog', None)
 
 
 def Parser():
   """Returns the default parser."""
   parser = optparse.OptionParser(version='%prog ' + __version__)
-  # cygwin has issues with parallel sync
-  jobs = 1 if sys.platform == 'cygwin' else 8
+  # cygwin and some arm boards have issues with parallel sync.
+  if sys.platform == 'cygwin' or platform.machine().startswith('arm'):
+    jobs = 1
+  else:
+    jobs = 8
   parser.add_option('-j', '--jobs', default=jobs, type='int',
                     help='Specify how many SCM commands can run in parallel; '
                           'default=%default')
   parser.add_option('-v', '--verbose', action='count', default=0,
                     help='Produces additional output for diagnostics. Can be '
                           'used up to three times for more logging info.')
   parser.add_option('--gclientfile', dest='config_filename',
                     default=os.environ.get('GCLIENT_FILE', '.gclient'),
                     help='Specify an alternate %default file')
   # Integrate standard options processing.
@@ skipping 68 matching lines @@
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   fix_encoding.fix_encoding()
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: