Resident set size (RSS) of multiple processes without double-counts on Linux.

tools/multi-process-rss.py

Index: tools/multi-process-rss.py
diff --git a/tools/multi-process-rss.py b/tools/multi-process-rss.py
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+#!/usr/bin/env python
+# Copyright (c) 2013 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.
+
+# Counts a resident set size (RSS) of multiple processes without double-counts.
+# If they share the same page frame, the page frame is counted only once.
+#
+# Usage:
+# ./multi-process-rss.py <pid>|<pid>r [...]
+#
+# If <pid> has 'r' at the end, all descendants of the process are accounted.
+#
+# Example:
+# ./multi-process-rss.py 12345 23456r
+#
+# The command line above counts the RSS of 1) process 12345, 2) process 23456
+# and 3) all descendant processes of process 23456.
+
+
+import collections
+import logging
+import os
+import psutil
+import sys
+
+
+if sys.platform.startswith('linux'):
+  _TOOLS_PATH = os.path.dirname(os.path.abspath(__file__))
+  _TOOLS_LINUX_PATH = os.path.join(_TOOLS_PATH, 'linux')
+  sys.path.append(_TOOLS_LINUX_PATH)
+  import procfs  # pylint: disable=F0401
+
+
+class _NullHandler(logging.Handler):
+  def emit(self, record):
+    pass
+
+
+_LOGGER = logging.getLogger('multi-process-rss')
+_LOGGER.addHandler(_NullHandler())
+
+
+def _recursive_get_children(pid):
+  children = psutil.Process(pid).get_children()
+  descendant = []
+  for child in children:
+    descendant.append(child.pid)
+    descendant.extend(_recursive_get_children(child.pid))
+  return descendant
+
+
+def list_pids(argv):
+  pids = []
+  for arg in argv[1:]:
+    try:
+      if arg.endswith('r'):
+        recursive = True
+        pid = int(arg[:-1])
+      else:
+        recursive = False
+        pid = int(arg)
+    except ValueError:
+      raise SyntaxError("%s is not an integer." % arg)
+    else:
+      pids.append(pid)
+    if recursive:
+      children = _recursive_get_children(pid)
+      pids.extend(children)
+
+  pids = sorted(set(pids), key=pids.index)  # uniq: maybe slow, but simple.
+
+  return pids
+
+
+def count_pageframes(pids):
+  pageframes = collections.defaultdict(int)
+  pagemap_dct = {}
+  for pid in pids:
+    maps = procfs.ProcMaps.load(pid)
+    pagemap_dct[pid] = procfs.ProcPagemap.load(pid, maps)
+
+  for pid, pagemap in pagemap_dct.iteritems():
+    for vma in pagemap.vma_internals.itervalues():
+      for pageframe, number in vma.pageframes.iteritems():
+        pageframes[pageframe] += number
+
+  return pageframes
+
+
+def main(argv):
+  logging_handler = logging.StreamHandler()
+  logging_handler.setLevel(logging.WARNING)
+  logging_handler.setFormatter(logging.Formatter(
+      '%(asctime)s:%(name)s:%(levelname)s:%(message)s'))
+
+  _LOGGER.setLevel(logging.WARNING)
+  _LOGGER.addHandler(logging_handler)
+
+  if sys.platform.startswith('linux'):
+    logging.getLogger('procfs').setLevel(logging.WARNING)
+    logging.getLogger('procfs').addHandler(logging_handler)
+    pids = list_pids(argv)
+    pageframes = count_pageframes(pids)
+  else:
+    _LOGGER.error('%s is not supported.' % sys.platform)
+    return 1
+
+  # TODO(dmikurube): Classify this total RSS.
+  print len(pageframes) * 4096
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))