tools/process-heap-prof.py

#!/usr/bin/env python
#
# Copyright 2009 the V8 project authors. All rights reserved.
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# This is an utility for converting V8 heap logs into .hp files that can
# be further processed using 'hp2ps' tool (bundled with GHC and Valgrind)
# to produce heap usage histograms.

# Sample usage:
# $ ./shell --log-gc script.js
# $ tools/process-heap-prof.py v8.log | hp2ps -c > script-heap-graph.ps
# ('-c' enables color, see hp2ps manual page for more options)
# or
# $ tools/process-heap-prof.py --js-cons-profile v8.log | hp2ps -c > script-heap-graph.ps
# to get JS constructor profile


import csv, sys, time

def process_logfile(filename, itemname):
  first_call_time = None
  sample_time = 0.0
  sampling = False
  try:
    logfile = open(filename, 'rb')
    try:
      logreader = csv.reader(logfile)

      print('JOB "v8"')
      print('DATE "%s"' % time.asctime(time.localtime()))
      print('SAMPLE_UNIT "seconds"')
      print('VALUE_UNIT "bytes"')

      for row in logreader:
        if row[0] == 'heap-sample-begin' and row[1] == 'Heap':
          sample_time = float(row[3])/1000.0
          if first_call_time == None:
            first_call_time = sample_time
          sample_time -= first_call_time
          print('BEGIN_SAMPLE %.2f' % sample_time)
          sampling = True
        elif row[0] == 'heap-sample-end' and row[1] == 'Heap':
          print('END_SAMPLE %.2f' % sample_time)
          sampling = False
        elif row[0] == itemname and sampling:
          print('%s %d' % (row[1], int(row[3])))
    finally:
      logfile.close()
  except:
    sys.exit('can\'t open %s' % filename)

if sys.argv[1] == '--js-cons-profile':
  process_logfile(sys.argv[2], 'heap-js-cons-item')
else:
  process_logfile(sys.argv[1], 'heap-sample-item')