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update: add a Rust fast-path when updating from null (and clean)...
update: add a Rust fast-path when updating from null (and clean) This case is easy to detect and we have all we need to generate a valid working copy and dirstate entirely in Rust, which speeds things up considerably: On my machine updating a repo of ~300k files goes from 10.00s down to 4.2s, all while consuming 50% less system time, with all caches hot. Something to note is that further improvements will probably happen with the upcoming `InnerRevlog` series that does smarter mmap hanlding, especially for filelogs. Here are benchmark numbers on a machine with only 4 cores (and no SMT enabled) ``` ### data-env-vars.name = heptapod-public-2024-03-25-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 5.328762 ~~~~~ rust: 1.308654 (-75.44%, -4.02) ### data-env-vars.name = mercurial-devel-2024-03-22-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 1.693271 ~~~~~ rust: 1.151053 (-32.02%, -0.54) ### data-env-vars.name = mozilla-unified-2024-03-22-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 38.901613 ~~~~~ rust: 11.637880 (-70.08%, -27.26) ### data-env-vars.name = netbsd-xsrc-public-2024-09-19-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 4.793727 ~~~~~ rust: 1.505905 (-68.59%, -3.29) ```
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changeset.tmpl
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{header}
<title>{repo|escape}: changeset {node|short}</title>
</head>
<body>
<div class="buttons">
<a href="{url|urlescape}log/{symrev}{sessionvars%urlparameter}">changelog</a>
<a href="{url|urlescape}shortlog/{symrev}{sessionvars%urlparameter}">shortlog</a>
<a href="{url|urlescape}graph/{symrev}{sessionvars%urlparameter}">graph</a>
<a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a>
<a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a>
<a href="{url|urlescape}file/{symrev}{sessionvars%urlparameter}">files</a>
<a href="{url|urlescape}raw-rev/{symrev}">raw</a>
{archives%archiveentry}
<a href="{url|urlescape}help{sessionvars%urlparameter}">help</a>
</div>
<h2><a href="/">Mercurial</a> {pathdef%breadcrumb} / changeset: {desc|strip|escape|firstline|nonempty}</h2>
<table id="changesetEntry">
<tr>
<th class="changeset">changeset {rev}:</th>
<td class="changeset"><a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{node|short}</a></td>
</tr>
{ifeq(count(parent), '2', parent%changesetparentdiff, parent%changesetparent)}
{child%changesetchild}
{changesettag}
<tr>
<th class="author">author:</th>
<td class="author">{author|obfuscate}</td>
</tr>
<tr>
<th class="date">date:</th>
<td class="date age">{date|rfc822date}</td>
</tr>
{ifeq(phase, 'public', '', '<tr>
<th class="phase">phase:</th>
<td class="phase">{phase|escape}</td>
</tr>')}
{if(obsolete, succsandmarkers%obsfateentry)}
{if(instabilities, whyunstable%whyunstableentry)}
<tr>
<th class="files">files:</th>
<td class="files">{files}</td>
</tr>
<tr>
<th class="description">description:</th>
<td class="description">{desc|strip|escape|websub|addbreaks|nonempty}</td>
</tr>
</table>
<div id="changesetDiff">
{diff}
</div>
{footer}