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tags: create new sortdict for performance reasons sortdict internally maintains a list of keys in insertion order. When a key is replaced via __setitem__, we .remove() from this list. This involves a linear scan and array adjustment. This is an expensive operation. The tags reading code was calling into sortdict.__setitem__ for each tag in a read .hgtags revision. For repositories with thousands of tags or thousands of .hgtags revisions, the overhead from list.remove() noticeable. This patch creates a new sortdict() so __setitem__ calls don't incur a list.remove. This doesn't appear to have any performance impact on my Firefox repository. But that's only because tags reading doesn't show up in profiles to begin with. I'm still waiting to hear from a user with over 10,000 tags and hundreds of heads on the impact of this patch.
author Gregory Szorc <gregory.szorc@gmail.com>
date Thu, 12 Nov 2015 13:16:04 -0800
parents 4b0fc75f9403
children 7794e13c6a7e
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<!-- This is the second screen displayed during the install. -->
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <meta http-equiv="Content-Style-Type" content="text/css">
  <title></title>
  <style type="text/css">
    p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Helvetica}
    p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px}
  </style>
</head>
<body>
<p class="p1">This is a prepackaged release of <a href="https://mercurial-scm.org/">Mercurial</a> for Mac OS X.</p>
<p class="p2"><br></p>
<br>
<p>
Please be sure to read the latest <a href="https://mercurial-scm.org/wiki/WhatsNew">release notes</a>.</p>
</body>
</html>