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revlog: read/cache chunks in fixed windows of 64 KB...
revlog: read/cache chunks in fixed windows of 64 KB When reading a revlog chunk, instead of reading up to 64 KB ahead of the request offset and caching that, this change caches a fixed window before and after the requested data that falls on 64 KB boundaries. This increases cache hits when reading revlogs backwards. Running perfmoonwalk on the Mercurial repo (with almost 20,000 changesets) on Mac OS X with an SSD, before this change: $ hg perfmoonwalk ! wall 2.307994 comb 2.310000 user 2.120000 sys 0.190000 (best of 5) (Each run has 10,668 cache hits and 9,304 misses.) After this change: $ hg perfmoonwalk ! wall 1.814117 comb 1.810000 user 1.810000 sys 0.000000 (best of 6) (19,931 cache hits, 62 misses.) On a busy NFS share, before this change: $ hg perfmoonwalk ! wall 17.000034 comb 4.100000 user 3.270000 sys 0.830000 (best of 3) After: $ hg perfmoonwalk ! wall 1.746115 comb 1.670000 user 1.660000 sys 0.010000 (best of 5)

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ReadMe.html
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r1288 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Mercurial for Windows</title>
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r5081 <meta http-equiv="Content-Type" content="text/html;charset=utf-8" >
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r2091 <style type="text/css">
<!--
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r8441 html {
font-family: sans-serif;
margin: 1em 2em;
}
p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
pre {
margin: 0.25em 0em;
padding: 0.5em;
background-color: #EEE;
border: thin solid #CCC;
}
.indented {
padding-left: 10pt;
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r2091 }
-->
</style>
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r1288 </head>
<body>
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r3863 <h1>Mercurial for Windows</h1>
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r1288
<p>Welcome to Mercurial for Windows!</p>
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r8438 <p>
Mercurial is a command-line application. You must run it from
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r1288 the Windows command prompt (or if you're hard core, a <a
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r8438 href="http://www.mingw.org/">MinGW</a> shell).
</p>
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r5081
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r8438 <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>
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r1288
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r8438 <p>
For documentation, please visit the <a
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r8936 href="http://mercurial.selenic.com/">Mercurial web site</a>.
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r4723 You can also download a free book, <a
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r8440 href="http://hgbook.red-bean.com/">Mercurial: The Definitive
Guide</a>.
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r8438 </p>
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r1288
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r8438 <p>
By default, Mercurial installs to <tt>C:\Program
Files\Mercurial</tt>. The Mercurial command is called
<tt>hg.exe</tt>.
</p>
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r1288
<h1>Testing Mercurial after you've installed it</h1>
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r8438 <p>
The easiest way to check that Mercurial is installed properly is
to just type the following at the command prompt:
</p>
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r1288
<pre>
hg
</pre>
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r8438 <p>
This command should print a useful help message. If it does,
other Mercurial commands should work fine for you.
</p>
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r1288
Lee Cantey
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r2307 <h1>Configuration notes</h1>
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r8438 <h4>Default editor</h4>
<p>
The default editor for commit messages is 'notepad'. You can set
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r8439 the <tt>EDITOR</tt> (or <tt>HGEDITOR</tt>) environment variable
to specify your preference or set it in <tt>mercurial.ini</tt>:
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r8438 </p>
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r2321 <pre>
[ui]
editor = whatever
</pre>
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r8438 <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>
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r4386
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r8438 <p>
By default, Mercurial will use the merge program defined by the
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r8439 <tt>HGMERGE</tt> environment variable, or uses the one defined
in the <tt>mercurial.ini</tt> file. (see <a
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r8936 href="http://mercurial.selenic.com/wiki/MergeProgram">MergeProgram</a>
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r8438 on the Mercurial Wiki for more information)
</p>
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r2307
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r1288 <h1>Reporting problems</h1>
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r8438 <p>
Before you report any problems, please consult the <a
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r8936 href="http://mercurial.selenic.com/">Mercurial web site</a>
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r8438 and see if your question is already in our list of <a
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r8936 href="http://mercurial.selenic.com/wiki/FAQ">Frequently
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r8438 Answered Questions</a> (the "FAQ").
</p>
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r1288
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r8438 <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@selenic.com">mercurial@selenic.com</a>.
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r1288 <b>Remember</b>, the more useful information you include in your
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r8438 report, the easier it will be for us to help you!
</p>
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r1288
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r8438 <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>
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<h1>Author and copyright information</h1>
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r8438 <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>
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r1288
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r8438 <p>
The Windows installer was written by <a
href="http://www.serpentine.com/blog">Bryan O'Sullivan</a>.
</p>
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r1288
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r8438 <p>
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r19435 Mercurial is Copyright 2005-2013 Matt Mackall and others. See
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r8438 the <tt>Contributors.txt</tt> file for a list of contributors.
</p>
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r1288
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r8438 <p>
Mercurial is free software; you can redistribute it and/or
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r1288 modify it under the terms of the <a
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r8438 href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt">GNU
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r10263 General Public License version 2</a> or any later version.
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r8438 </p>
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r1288
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r8438 <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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r1288 </body>
</html>