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status: prefer relative paths in Rust code...
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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ReadMe.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<head>
<title>Mercurial for Windows</title>
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<h1>Mercurial for Windows</h1>
<p>Welcome to Mercurial for Windows!</p>
<p>
Mercurial is a command-line application. You must run it from
the Windows command prompt (or if you're hard core, a <a
href="http://www.mingw.org/">MinGW</a> shell).
</p>
<p class="indented">
<i>Note: the standard <a href="http://www.mingw.org/">MinGW</a>
msys startup script uses rxvt which has problems setting up
standard input and output. Running bash directly works
correctly.</i>
</p>
<p>
For documentation, please visit the <a
href="https://mercurial-scm.org/">Mercurial web site</a>.
You can also download a free book, <a
href="https://book.mercurial-scm.org/">Mercurial: The Definitive
Guide</a>.
</p>
<p>
By default, Mercurial installs to <tt>C:\Program
Files\Mercurial</tt>. The Mercurial command is called
<tt>hg.exe</tt>.
</p>
<h1>Testing Mercurial after you've installed it</h1>
<p>
The easiest way to check that Mercurial is installed properly is
to just type the following at the command prompt:
</p>
<pre>
hg
</pre>
<p>
This command should print a useful help message. If it does,
other Mercurial commands should work fine for you.
</p>
<h1>Configuration notes</h1>
<h4>Default editor</h4>
<p>
The default editor for commit messages is 'notepad'. You can set
the <tt>EDITOR</tt> (or <tt>HGEDITOR</tt>) environment variable
to specify your preference or set it in <tt>mercurial.ini</tt>:
</p>
<pre>
[ui]
editor = whatever
</pre>
<h4>Configuring a Merge program</h4>
<p>
It should be emphasized that Mercurial by itself doesn't attempt
to do a Merge at the file level, neither does it make any
attempt to Resolve the conflicts.
</p>
<p>
By default, Mercurial will use the merge program defined by the
<tt>HGMERGE</tt> environment variable, or uses the one defined
in the <tt>mercurial.ini</tt> file. (see <a
href="https://mercurial-scm.org/wiki/MergeProgram">MergeProgram</a>
on the Mercurial Wiki for more information)
</p>
<h1>Reporting problems</h1>
<p>
Before you report any problems, please consult the <a
href="https://mercurial-scm.org/">Mercurial web site</a>
and see if your question is already in our list of <a
href="https://mercurial-scm.org/wiki/FAQ">Frequently
Answered Questions</a> (the "FAQ").
</p>
<p>
If you cannot find an answer to your question, please feel free
to send mail to the Mercurial mailing list, at <a
href="mailto:mercurial@mercurial-scm.org">mercurial@mercurial-scm.org</a>.
<b>Remember</b>, the more useful information you include in your
report, the easier it will be for us to help you!
</p>
<p>
If you are IRC-savvy, that's usually the fastest way to get
help. Go to <tt>#mercurial</tt> on <tt>irc.freenode.net</tt>.
</p>
<h1>Author and copyright information</h1>
<p>
Mercurial was written by <a href="http://www.selenic.com">Matt
Mackall</a>, and is maintained by Matt and a team of volunteers.
</p>
<p>
The Windows installer was written by <a
href="http://www.serpentine.com/blog">Bryan O'Sullivan</a>.
</p>
<p>
Mercurial is Copyright 2005-2021 Olivia Mackall and others.
</p>
<p>
Mercurial is free software; you can redistribute it and/or
modify it under the terms of the <a
href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt">GNU
General Public License version 2</a> or any later version.
</p>
<p>
Mercurial is distributed in the hope that it will be useful, but
<b>without any warranty</b>; without even the implied warranty
of <b>merchantability</b> or <b>fitness for a particular
purpose</b>. See the GNU General Public License for more
details.
</p>
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