Make test_sky work on machines with fewer than 4 CPUs.

sky/tools/webkitpy/layout_tests/port/base.py

 # Copyright (C) 2010 Google Inc. 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
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 19 matching lines @@
 test infrastructure (the Port and Driver classes)."""
 
 import cgi
 import difflib
 import errno
 import itertools
 import logging
 import os
 import operator
 import optparse
+import math
 import re
 import sys
 
 try:
     from collections import OrderedDict
 except ImportError:
     # Needed for Python < 2.7
     from webkitpy.thirdparty.ordered_dict import OrderedDict
 
 
@@ skipping 213 matching lines @@
     def pretty_patch_available(self):
         if self._pretty_patch_available is None:
             self._pretty_patch_available = self.check_pretty_patch(logging=False)
         return self._pretty_patch_available
 
     def default_child_processes(self):
         """Return the number of drivers to use for this port."""
         # FIXME: See if we can reduce the denominator here without causing timeouts.
         # Maybe we need to run one sky_shell process and multiple sky_viewers
         # instead of multiple sky_shells
-        return int(self._executive.cpu_count() / 4)
+        return int(math.ceil(float(self._executive.cpu_count()) / 4))
 
     def default_max_locked_shards(self):
         """Return the number of "locked" shards to run in parallel (like the http tests)."""
         return self.default_child_processes()
 
     def baseline_path(self):
         """Return the absolute path to the directory to store new baselines in for this port."""
         # FIXME: remove once all callers are calling either baseline_version_dir() or baseline_platform_dir()
         return self.baseline_version_dir()
 
@@ skipping 428 matching lines @@
         return reftest_list.get(self._filesystem.join(self.layout_tests_dir(), test_name), [])  # pylint: disable=E1103
 
     def tests(self, paths):
         """Return the list of tests found matching paths."""
         tests = self._real_tests(paths)
         tests.extend(self._virtual_tests(paths, self.populated_virtual_test_suites()))
         return tests
 
     def _real_tests(self, paths):
         # When collecting test cases, skip these directories
-        skipped_directories = set(['.svn', '_svn', 'platform', 'resources', 'support', 'script-tests', 'reference', 'reftest'])
+        skipped_directories = set(['.svn', '_svn', 'platform', 'resources', 'support', 'script-tests', 'reference', 'reftest', 'conf'])
         files = find_files.find(self._filesystem, self.layout_tests_dir(), paths, skipped_directories, Port.is_test_file, self.test_key)
         return [self.relative_test_filename(f) for f in files]
 
     # When collecting test cases, we include any file with these extensions.
-    _supported_file_extensions = set(['.html', '.xml', '.xhtml', '.xht', '.pl',
-                                      '.htm', '.php', '.svg', '.mht', '.pdf'])
+    _supported_file_extensions = set(['.html'])
 
     @staticmethod
     # If any changes are made here be sure to update the isUsedInReftest method in old-run-webkit-tests as well.
     def is_reference_html_file(filesystem, dirname, filename):
         if filename.startswith('ref-') or filename.startswith('notref-'):
             return True
         filename_wihout_ext, unused = filesystem.splitext(filename)
         for suffix in ['-expected', '-expected-mismatch', '-ref', '-notref']:
             if filename_wihout_ext.endswith(suffix):
                 return True
@@ skipping 1021 matching lines @@
 
 class PhysicalTestSuite(object):
     def __init__(self, base, args):
         self.name = base
         self.base = base
         self.args = args
         self.tests = set()
 
     def __repr__(self):
         return "PhysicalTestSuite('%s', '%s', %s)" % (self.name, self.base, self.args)