1 # memory.py - track memory usage

     2 #

     3 # Copyright 2009 Matt Mackall <mpm@selenic.com> and others

     4 #

     5 # This software may be used and distributed according to the terms of the

     6 # GNU General Public License version 2, incorporated herein by reference.

     7 

     8 '''helper extension to measure memory usage

     9 

    10 Reads current and peak memory usage from ``/proc/self/status`` and

    11 prints it to ``stderr`` on exit.

    12 '''

    13 

    14 import atexit

    15 

    16 def memusage(ui):

    17     """Report memory usage of the current process."""

    18     status = None

    19     result = {'peak': 0, 'rss': 0}

    20     try:

    21         # This will only work on systems with a /proc file system

    22         # (like Linux).

    23         status = open('/proc/self/status', 'r')

    24         for line in status:

    25             parts = line.split()

    26             key = parts[0][2:-1].lower()

    27             if key in result:

    28                 result[key] = int(parts[1])

    29     finally:

    30         if status is not None:

    31             status.close()

    32     ui.write_err(", ".join(["%s: %.1f MiB" % (key, value/1024.0)

    33                             for key, value in result.iteritems()]) + "\n")

    34 

    35 def extsetup(ui):

    36     atexit.register(memusage, ui)