# memory.py - track memory usage

#

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

#

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

# GNU General Public License version 2 or any later version.

'''helper extension to measure memory usage

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

prints it to ``stderr`` on exit.

'''

import atexit

def memusage(ui):

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

    status = None

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

    try:

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

        # (like Linux).

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

        for line in status:

            parts = line.split()

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

            if key in result:

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

    finally:

        if status is not None:

            status.close()

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

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

def extsetup(ui):

    atexit.register(memusage, ui)