view contrib/memory.py @ 40681:c0a1686d9391

perf: use the new setup function in "perfbookmarks"

This command was picked arbitrarily to display the usefulness of the new
feature. In my Mercurial repository (with very few bookmarks), moving cache
cleanup in the dedicated setup function has a visible  and stable effect on
the benchmark number.

before: ! wall 0.000061 comb 0.000000 user 0.000000 sys 0.000000 (median of 40837)
after:  ! wall 0.000058 comb 0.000000 user 0.000000 sys 0.000000 (median of 40500)

# memory.py - track memory usage
#
# Copyright 2009 Matt Mackall <[e-mail]> 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.
'''

from __future__ import absolute_import

def memusage(ui):
    """Report memory usage of the current process."""
    result = {'peak': 0, 'rss': 0}
    with open('/proc/self/status', 'r') as status:
        # This will only work on systems with a /proc file system
        # (like Linux).
        for line in status:
            parts = line.split()
            key = parts[0][2:-1].lower()
            if key in result:
                result[key] = int(parts[1])
    ui.write_err(", ".join(["%s: %.1f MiB" % (k, v / 1024.0)
                            for k, v in result.iteritems()]) + "\n")

def extsetup(ui):
    ui.atexit(memusage, ui)