status: prefer relative paths in Rust code … when the repository root is under the current directory, so the kernel needs to traverse fewer directory in every call to `read_dir` or `symlink_metadata`. Better yet would be to use libc functions like `openat` and `fstatat` to remove such repeated traversals entirely, but the standard library does not provide APIs based on those. Maybe with a crate like https://crates.io/crates/openat instead? Benchmarks of `rhg status` show that this patch is neutral in some configurations, and makes the command up to ~20% faster in others. Below is semi-arbitrary subset of results. The four numeric columns are: time (in seconds) with this changeset’s parent, time with this changeset, time difference (negative is better), time ratio (less than 1 is better). ``` mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97) mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97) mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00) mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82) mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82) mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96) mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95) mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78) mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81) mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78) mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82) mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96) mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98) mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82) mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82) netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99) netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87) ``` Differential Revision: https://phab.mercurial-scm.org/D12175

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#!/usr/bin/env python3

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#

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# mercurial - scalable distributed SCM

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#

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# Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>

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#

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

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

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from __future__ import absolute_import

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import os

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import sys

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libdir = '@LIBDIR@'

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if libdir != '@' 'LIBDIR' '@':

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    if not os.path.isabs(libdir):

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        libdir = os.path.join(

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            os.path.dirname(os.path.realpath(__file__)), libdir

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        )

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        libdir = os.path.abspath(libdir)

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    sys.path.insert(0, libdir)

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# Make `pip install --user ...` packages available to the official Windows

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# build.  Most py2 packaging installs directly into the system python

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# environment, so no changes are necessary for other platforms.  The Windows

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# py2 package uses py2exe, which lacks a `site` module.  Hardcode it according

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# to the documentation.

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if getattr(sys, 'frozen', None) == 'console_exe':

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    vi = sys.version_info

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    appdata = os.environ.get('APPDATA')

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    if appdata:

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        sys.path.append(

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            os.path.join(

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                appdata,

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                'Python',

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                'Python%d%d' % (vi[0], vi[1]),

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                'site-packages',

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            )

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        )

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from hgdemandimport import tracing

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with tracing.log('hg script'):

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    # enable importing on demand to reduce startup time

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    try:

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        if sys.version_info[0] < 3 or sys.version_info >= (3, 6):

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            import hgdemandimport

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            hgdemandimport.enable()

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    except ImportError:

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        sys.stderr.write(

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            "abort: couldn't find mercurial libraries in [%s]\n"

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            % ' '.join(sys.path)

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        )

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        sys.stderr.write("(check your install and PYTHONPATH)\n")

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        sys.exit(-1)

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    from mercurial import dispatch

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    dispatch.run()