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util: lower water mark when removing nodes after cost limit reached...
util: lower water mark when removing nodes after cost limit reached See the inline comment for the reasoning here. This is a pretty common strategy for garbage collectors, other cache-like primtives. The performance impact is substantial: $ hg perflrucachedict --size 4 --gets 1000000 --sets 1000000 --mixed 1000000 --costlimit 100 ! inserts w/ cost limit ! wall 1.659181 comb 1.650000 user 1.650000 sys 0.000000 (best of 7) ! wall 1.722122 comb 1.720000 user 1.720000 sys 0.000000 (best of 6) ! mixed w/ cost limit ! wall 1.139955 comb 1.140000 user 1.140000 sys 0.000000 (best of 9) ! wall 1.182513 comb 1.180000 user 1.180000 sys 0.000000 (best of 9) $ hg perflrucachedict --size 1000 --gets 1000000 --sets 1000000 --mixed 1000000 --costlimit 10000 ! inserts ! wall 0.679546 comb 0.680000 user 0.680000 sys 0.000000 (best of 15) ! sets ! wall 0.825147 comb 0.830000 user 0.830000 sys 0.000000 (best of 13) ! inserts w/ cost limit ! wall 25.105273 comb 25.080000 user 25.080000 sys 0.000000 (best of 3) ! wall 1.724397 comb 1.720000 user 1.720000 sys 0.000000 (best of 6) ! mixed ! wall 0.807096 comb 0.810000 user 0.810000 sys 0.000000 (best of 13) ! mixed w/ cost limit ! wall 12.104470 comb 12.070000 user 12.070000 sys 0.000000 (best of 3) ! wall 1.190563 comb 1.190000 user 1.190000 sys 0.000000 (best of 9) $ hg perflrucachedict --size 1000 --gets 1000000 --sets 1000000 --mixed 1000000 --costlimit 10000 --mixedgetfreq 90 ! inserts ! wall 0.711177 comb 0.710000 user 0.710000 sys 0.000000 (best of 14) ! sets ! wall 0.846992 comb 0.850000 user 0.850000 sys 0.000000 (best of 12) ! inserts w/ cost limit ! wall 25.963028 comb 25.960000 user 25.960000 sys 0.000000 (best of 3) ! wall 2.184311 comb 2.180000 user 2.180000 sys 0.000000 (best of 5) ! mixed ! wall 0.728256 comb 0.730000 user 0.730000 sys 0.000000 (best of 14) ! mixed w/ cost limit ! wall 3.174256 comb 3.170000 user 3.170000 sys 0.000000 (best of 4) ! wall 0.773186 comb 0.770000 user 0.770000 sys 0.000000 (best of 13) $ hg perflrucachedict --size 100000 --gets 1000000 --sets 1000000 --mixed 1000000 --mixedgetfreq 90 --costlimit 5000000 ! gets ! wall 1.191368 comb 1.190000 user 1.190000 sys 0.000000 (best of 9) ! wall 1.195304 comb 1.190000 user 1.190000 sys 0.000000 (best of 9) ! inserts ! wall 0.950995 comb 0.950000 user 0.950000 sys 0.000000 (best of 11) ! inserts w/ cost limit ! wall 1.589732 comb 1.590000 user 1.590000 sys 0.000000 (best of 7) ! sets ! wall 1.094941 comb 1.100000 user 1.090000 sys 0.010000 (best of 9) ! mixed ! wall 0.936420 comb 0.940000 user 0.930000 sys 0.010000 (best of 10) ! mixed w/ cost limit ! wall 0.882780 comb 0.870000 user 0.870000 sys 0.000000 (best of 11) This puts us ~2x slower than caches without cost accounting. And for read-heavy workloads (the prime use cases for caches), performance is nearly identical. In the worst case (pure write workloads with cost accounting enabled), we're looking at ~1.5us per insert on large caches. That seems "fast enough." Differential Revision: https://phab.mercurial-scm.org/D4505
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changeset.tmpl
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{header}
<title>{repo|escape}: changeset {rev}:{node|short}</title>
<link rel="alternate" type="application/atom+xml"
href="{url|urlescape}atom-log" title="Atom feed for {repo|escape}"/>
<link rel="alternate" type="application/rss+xml"
href="{url|urlescape}rss-log" title="RSS feed for {repo|escape}"/>
</head>
<body>
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<a href="{logourl}" title="Mercurial" style="float: right;">Mercurial</a>
<a href="/">Mercurial</a> {pathdef%breadcrumb} / changeset
</div>
<div class="page_nav">
<div>
<a href="{url|urlescape}summary{sessionvars%urlparameter}">summary</a> |
<a href="{url|urlescape}shortlog/{symrev}{sessionvars%urlparameter}">shortlog</a> |
<a href="{url|urlescape}log/{symrev}{sessionvars%urlparameter}">changelog</a> |
<a href="{url|urlescape}graph/{symrev}{sessionvars%urlparameter}">graph</a> |
<a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a> |
<a href="{url|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a> |
<a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a> |
<a href="{url|urlescape}file/{symrev}{sessionvars%urlparameter}">files</a> |
changeset |
<a href="{url|urlescape}raw-rev/{symrev}">raw</a> {archives%archiveentry} |
<a href="{url|urlescape}help{sessionvars%urlparameter}">help</a>
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{searchform}
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<a class="title" href="{url|urlescape}raw-rev/{node|short}">
{desc|strip|escape|firstline|nonempty}
{alltags}
</a>
</div>
<div class="title_text">
<table cellspacing="0">
<tr><td>author</td><td>{author|obfuscate}</td></tr>
<tr><td></td><td class="date age">{date|rfc822date}</td></tr>
{branch%changesetbranch}
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<td>changeset {rev}</td>
<td style="font-family:monospace"><a class="list" href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{node|short}</a></td>
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{if(obsolete, succsandmarkers%obsfateentry)}
{if(instabilities, whyunstable%whyunstableentry)}
{ifeq(count(parent), '2', parent%changesetparentdiff, parent%changesetparent)}
{child%changesetchild}
</table></div>
<div class="page_body description">{desc|strip|escape|websub|nonempty}</div>
<div class="list_head"></div>
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{files}
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{footer}