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changegroup: store old heads as a set...
changegroup: store old heads as a set Previously, the "oldheads" variable was a list. On a repository at Mozilla with 46,492 heads, profiling revealed that list membership testing was dominating execution time of applying small changegroups. This patch converts the list of old heads to a set. This makes membership testing significantly faster. On the aforementioned repository with 46,492 heads: $ hg unbundle <file with 1 changeset> before: 18.535s wall after: 1.303s Consumers of this variable only check for truthiness (`if oldheads`), length (`len(oldheads)`), and (most importantly) item membership (`h not in oldheads` - which occurs twice). So, the change to a set should be safe and suitable for stable. The practical effect of this change is that changegroup application and related operations (like `hg push`) no longer exhibit an O(n^2) CPU explosion as the number of heads grows.
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manifest.tmpl
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{header}
<title>{repo|escape}: {node|short} {path|escape}</title>
</head>
<body>
<div class="container">
<div class="menu">
<div class="logo">
<a href="{logourl}">
<img src="{staticurl|urlescape}{logoimg}" alt="mercurial" /></a>
</div>
<ul>
<li><a href="{url|urlescape}shortlog/{symrev}{sessionvars%urlparameter}">log</a></li>
<li><a href="{url|urlescape}graph/{symrev}{sessionvars%urlparameter}">graph</a></li>
<li><a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a></li>
<li><a href="{url|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a></li>
<li><a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a></li>
</ul>
<ul>
<li><a href="{url|urlescape}rev/{symrev}{sessionvars%urlparameter}">changeset</a></li>
<li class="active">browse</li>
</ul>
<ul>
{archives%archiveentry}
</ul>
<ul>
<li><a href="{url|urlescape}help{sessionvars%urlparameter}">help</a></li>
</ul>
</div>
<div class="main">
<h2 class="breadcrumb"><a href="/">Mercurial</a> {pathdef%breadcrumb}</h2>
<h3>
directory {path|escape} @ {rev}:<a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{node|short}</a>
{branch%changelogbranchname}{tags%changelogtag}{bookmarks%changelogtag}
</h3>
<form class="search" action="{url|urlescape}log">
{sessionvars%hiddenformentry}
<p><input name="rev" id="search1" type="text" size="30" /></p>
<div id="hint">{searchhint}</div>
</form>
<table class="bigtable">
<thead>
<tr>
<th class="name">name</th>
<th class="size">size</th>
<th class="permissions">permissions</th>
</tr>
</thead>
<tbody class="stripes2">
<tr class="fileline">
<td class="name"><a href="{url|urlescape}file/{symrev}{up|urlescape}{sessionvars%urlparameter}">[up]</a></td>
<td class="size"></td>
<td class="permissions">drwxr-xr-x</td>
</tr>
{dentries%direntry}
{fentries%fileentry}
</tbody>
</table>
</div>
</div>
{footer}