Add an extract-build-times.py application.

This app takes a morph cache directory and lists the build times of
all cached chunks.

1 files changed, 68 insertions, 0 deletions

diff --git a/extract-build-times.py b/extract-build-times.py
new file mode 100644
index 00000000..9b1384de
--- /dev/null
+++ b/extract-build-times.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2012  Codethink Limited
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+import cliapp
+import glob
+import json
+import os
+import re
+import StringIO
+
+
+class ExtractBuildTimes(cliapp.Application):
+
+    '''Extracts build times of chunks in a morph cache directory.
+
+    Given a morph cache directory as the first argument, this app finds all
+    cached chunks, loads their meta data and prints their build times.
+
+    '''
+
+    def process_args(self, args):
+        cachedir = args[0]
+
+        def chunk_hash(chunk):
+            short = re.split('\.', chunk)
+            return os.path.basename(short[-3])
+
+        def chunk_name(chunk):
+            short = re.split('\.', chunk)
+            return short[-1]
+
+        chunks = glob.glob(os.path.join(cachedir, '*.chunk.*'))
+        items = []
+
+        for chunk in chunks:
+            hash = chunk_hash(chunk)
+            metafile = os.path.join(cachedir, '%s.meta' % hash)
+            with open(metafile) as f:
+                data = f.read()
+                io = StringIO.StringIO(data)
+                metainfo = json.load(io)
+                time = metainfo['build-times']['overall-build']['delta']
+                minutes = float(time) / 60.0
+                items.append((chunk_name(chunk), minutes))
+
+        items = sorted(items, key=lambda x: x[1], reverse=True)
+
+        for name, time in items:
+            print '%30s: %3.0f mins' % (name, time)
+
+
+if __name__ == '__main__':
+    ExtractBuildTimes().run()