annotate contrib/memory.py @ 46017:068307b638f4

statprof: fix off-by-one-line error in output

martinvonz claims they thought that this was intentional, but couldn't remember
the reasoning for it. I can't understand why it would be preferable, and I
didn't see anything in the comments in the file about why this would be useful,
so I'm hopefully not breaking anything by "fixing" it.

### Old output

```
| 100.0%  0.01s  dispatch.py:    run               line 43:  dispatch.run()
| 100.0%  0.01s  dispatch.py:    dispatch          line 115:  status = dispatch(req)
| 100.0%  0.01s  dispatch.py:    _runcatch         line 266:  ret = _runcatch(req) or 0
| 100.0%  0.01s  dispatch.py:    _callcatch        line 442:  return _callcatch(ui, _runc...
| 100.0%  0.01s  scmutil.py:     callcatch         line 451:  return scmutil.callcatch(ui...
| 100.0%  0.01s  dispatch.py:    _runcatchfunc     line 155:  return func()
| 100.0%  0.01s  dispatch.py:    _dispatch         line 432:  return _dispatch(req)
| 100.0%  0.01s  hg.py:          repository        line 1179:  repo = hg.repository(
| 100.0%  0.01s  hg.py:          _peerorrepo       line 221:  peer = _peerorrepo(
| 100.0%  0.01s  util.py:        __getattribute__  line 188:  obj = _peerlookup(path).ins...
| 100.0%  0.01s  localrepo.py:   makelocalrepositoryline 3227:  return makelocalrepository(...
| 100.0%  0.01s  localrepo.py:   __init__          line 683:  return cls(
| 100.0%  0.01s  util.py:        __getattribute__  line 1262:  self._extrafilterid = repov...
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: exec_moduleline          245:  self.__spec__.loader.exec_m...
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: get_codeline       779:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: path_statsline         868:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: _path_statline         1012:
```

### New output

```
| 100.0%  0.01s  hg:             <module>          line 43:  dispatch.run()
| 100.0%  0.01s  dispatch.py:    run               line 115:  status = dispatch(req)
| 100.0%  0.01s  dispatch.py:    dispatch          line 266:  ret = _runcatch(req) or 0
| 100.0%  0.01s  dispatch.py:    _runcatch         line 442:  return _callcatch(ui, _runc...
| 100.0%  0.01s  dispatch.py:    _callcatch        line 451:  return scmutil.callcatch(ui...
| 100.0%  0.01s  scmutil.py:     callcatch         line 155:  return func()
| 100.0%  0.01s  dispatch.py:    _runcatchfunc     line 432:  return _dispatch(req)
| 100.0%  0.01s  dispatch.py:    _dispatch         line 1179:  repo = hg.repository(
| 100.0%  0.01s  hg.py:          repository        line 221:  peer = _peerorrepo(
| 100.0%  0.01s  hg.py:          _peerorrepo       line 188:  obj = _peerlookup(path).ins...
| 100.0%  0.01s  localrepo.py:   instance          line 3227:  return makelocalrepository(...
| 100.0%  0.01s  localrepo.py:   makelocalrepositoryline 683:  return cls(
| 100.0%  0.01s  localrepo.py:   __init__          line 1262:  self._extrafilterid = repov...
| 100.0%  0.01s  util.py:        __getattribute__  line 245:  self.__spec__.loader.exec_m...
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: exec_moduleline          779:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: get_codeline       868:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: path_statsline         1012:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: _path_statline         87:
```

Differential Revision: https://phab.mercurial-scm.org/D9510

# 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)