contrib/memory.py

tests: use basic format code "%Y" instead of "%s" for test portability

On Windows, strftime() doesn't support format code "%s", and it causes
"invalid format string" error.

    https://msdn.microsoft.com/en-us/library/fe06s4ak.aspx

test-command-template.t examines not seconds value in UTC, but
arithmetic calculation. Therefore, using format code "%Y" instead of
"%s" should be reasonable.

FYI:

- Python standard library reference doesn't list "%s" up in format
  code list required for "C standard (1989 version)", even though it
  also mentions that additional format codes are required for "C
  standard (1999 version)"

  https://docs.python.org/2.7/library/datetime.html#strftime-and-strptime-behavior

- The Open Group Base Specifications Issue 7 (IEEE Std 1003.1-2008,
  2016 Edition) doesn't require strftime to support format code "%s"

  http://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html

- "man strftime" of (Open/Oracle) Solaris and Mac OS X (= UNIX
  certified OSs) describes about format code "%s"

# 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
import atexit

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" % (key, value / 1024.0)
                            for key, value in result.iteritems()]) + "\n")

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