Enable compression of any perf logs greater than 10 MB.

masters/master.chromium.perf/master.cfg

 # Copyright 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.
 
 # This is the buildmaster config file for the 'chromium.perf' bot. It must
 # be installed as 'master.cfg' in your buildmaster's base directory
 # (although the filename can be changed with the --basedir option to
 # 'mktap buildbot master').
 
 # It has one job: define a dictionary named BuildmasterConfig. This
@@ skipping 27 matching lines @@
 
 
 # This is the dictionary that the buildmaster pays attention to. We also use
 # a shorter alias to save typing.
 c = BuildmasterConfig = {}
 
 # 'slavePortnum' defines the TCP port to listen on. This must match the value
 # configured into the buildslaves (with their --master option)
 c['slavePortnum'] = ActiveMaster.slave_port
 
-# Disable compression for the stdio files.
-c['logCompressionLimit'] = False
+# Enable compression for any stdio log file larger than 10 MB.
+c['logCompressionLimit'] = 1024 * 1024 * 10 # 10 MB
 
 # Load the list of slaves.
 slaves = slaves_list.SlavesList('slaves.cfg', 'ChromiumPerf')
 
 config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
 
 def recipe_factory(recipe):
   f_annotations = annotator_factory.AnnotatorFactory(ActiveMaster)
   return f_annotations.BaseFactory(recipe=recipe)
 
@@ skipping 189 matching lines @@
 
 ####### PROJECT IDENTITY
 
 # the 'projectName' string will be used to describe the project that this
 # buildbot is working on. For example, it is used as the title of the
 # waterfall HTML page. The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url