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deltas: set estimated compression upper bound to "3x" instead of "10x"
In pratice, we very rarely observer compression better than "3x" on manifest
deltas. Having a more aggressive estimate significantly helps our pathological
use case on a private repository. Here are a comparison of timings using
different upper bound.
Estimated compression | ø | ×10 | ×5 | ×3 |
timing | 14.11 | 2.61 | 1.96 | 1.53 |
We also tested the impact of this series on an array of public repositories.
This shown no impact in either size nor timing.
Full data set below for those interested.
Size
----
Regarding size, not significant impact have been noticed on neither public nor
private repositories. Here are the number we gathered on public repositories:
zlib/upperbound | no | 10x | 5x | 3x
mercurial | 5 875 730 | 5 875 730 | 5 875 730 | 5 875 730
pypy | 27 782 913 | 27 782 913 | 27 782 913 | 27 782 913
netbeans | 159 161 207 | 159 161 207 | 159 161 207 | 159 959 879 (+0.5%)
mozilla-central | 323 841 642 | 323 841 642 | 323 841 642 | 319 867 519 (-2.5%)
mozilla-try | 746 649 123 | 746 649 123 | 746 649 123 | 741 155 568 (-0.7%)
private-repo | 1 485 287 294 | 1 485 287 294 | 1 485 287 294 | 1 409 248 382 (-5.1%)
zstd/upperbound | no | 10x | 5x | 3x
mercurial | 5 895 206 | 5 895 206 | 5 895 206 | 5 895 206
pypy | 28 689 230 | 28 689 230 | 28 689 230 | 28 689 230
netbeans | 157 636 387 | 157 636 387 | 157 636 387 | 159 692 678 (+1.3%)
mozilla-central | 317 650 281 | 317 650 281 | 317 650 281 | 319 613 603 (+0.6%)
mozilla-try | 737 555 275 | 737 555 275 | 737 555 275 | 738 079 473 (+0.1%)
private-repo | 1 352 362 982 | 1 352 362 982 | 1 346 961 880 | 1 361 327 384 (+0.7%)
Speed
------
Timing gathered using `hg perfrevlogwrite -m`. Value are in seconds.
mercurial
zlib | no | 10x | 5x | 3x |
total | 65.551783 | 65.388887 | 65.260658 | 65.321199 |
max | 0.034544 | 0.034571 | 0.034659 | 0.034521 |
99.99% | 0.034544 | 0.034571 | 0.034659 | 0.034521 |
zstd | no | 10x | 5x | 3x |
total | 49.118449 | 49.054062 | 48.753588 | 48.740230 |
max | 0.009338 | 0.009239 | 0.009202 | 0.009178 |
99.99% | 0.007618 | 0.007639 | 0.007626 | 0.007621 |
pypy
zlib | no | 10x | 5x | 3x |
total | 560.865984 | 558.983817 | 559.083815 | 559.349152 |
max | 0.219614 | 0.215922 | 0.218112 | 0.218107 |
99.99% | 0.219614 | 0.215922 | 0.218112 | 0.218107 |
zstd | no | 10x | 5x | 3x |
total | 349.393280 | 347.395819 | 347.185407 | 345.643985 |
max | 0.084143 | 0.083536 | 0.081834 | 0.082178 |
99.99% | 0.039445 | 0.039639 | 0.039612 | 0.039175 |
netbeans
zlib | no | 10x | 5x | 3x |
total | 33103.327727 | 33314.932260 | 33211.745233 | 33345.891778 |
max | 2.666852 | 2.672059 | 2.662453 | 2.662936 |
99.99% | 2.058772 | 2.070429 | 2.069569 | 2.064653 |
zstd | no | 10x | 5x | 3x |
total | 20112.102708 | 20095.879719 | 20083.390300 | 20123.221859 |
max | 2.063482 | 2.062851 | 2.065229 | 2.060147 |
99.99% | 1.146647 | 1.143794 | 1.142933 | 1.146529 |
mozilla
zlib | no | 10x | 5x | 3x |
total | 41374.102138 | 41418.816773 | 41381.956370 | 41334.280732 |
max | 3.383474 | 3.387400 | 3.405711 | 3.387316 |
99.99% | 1.006755 | 1.005954 | 1.007700 | 1.007373 |
zstd | no | 10x | 5x | 3x |
total | 24689.691520 | 24643.939662 | 24664.630027 | 24664.512714 |
max | 1.460822 | 1.449640 | 1.439747 | 1.465304 |
99.99% | 0.527111 | 0.527377 | 0.527807 | 0.527226 |
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Fri, 26 Apr 2019 00:48:12 +0200 |
parents | 4b0fc75f9403 |
children |
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/* * Styles for man pages, which match with https://mercurial-scm.org/ * * Color scheme & layout are borrowed from * https://mercurial-scm.org/css/styles.css * * Some styles are from html4css1.css from Docutils, which is in the * public domain. */ body { margin: 0; padding: 0; font-family: sans-serif; } .document { position: relative; /* be a top of absolute positioning */ margin: 1.5em 1.8em; padding: 0; line-height: 1.3; } /* layout: toc to right */ #contents { position: absolute; right: 0; top: 0; width: 26%; } /* layout: others to left */ h1.title, h2.subtitle, .section { width: 72%; } .section .section { width: auto; } table.docinfo { max-width: 72%; } /* headings */ h1, h2, .topic-title, .admonition-title { font-family: "MgOpen Cosmetica", "Lucida Sans Unicode", sans-serif; font-weight: normal; } h1, h2, .topic-title, .admonition-title { margin: 1em 0 0.5em; } h1.title { font-size: 300%; } h2.subtitle, h1 { font-size: 200%; } h2, .topic-title, .admonition-title { font-size: 140%; } /* subtitle starts with lowercase in man pages, but not in HTML */ h2.subtitle:first-letter { text-transform: uppercase; } /* override first/last margin */ .first, h1.title, h2.subtitle { margin-top: 0 !important; } .last, .with-subtitle { margin-bottom: 0 !important; } blockquote, pre, dd .option-list, .field-list { margin: 0.2em 0 1em 2em; } kbd, tt, pre { font-family: monospace; } dt { font-weight: bold; } dd { margin-bottom: 0.5em; } th, td { padding: 0.1em 0.2em; border: 0 none; } th { font-weight: bold; text-align: left; } a:link, a:visited { text-decoration: underline; } a:hover, a:focus { text-decoration: none; } a:link { color: #00b5f1; } a:visited { color: #5c9caf; } a:link.toc-backref, a:visited.toc-backref { text-decoration: none; color: inherit; /* NOTE: `inherit' is not supported by IE6 */ } div.admonition, div.attention, div.caution, div.danger, div.error, div.hint, div.important, div.note, div.tip, div.warning { border-top: 1px #ccc solid; border-bottom: 1px #ccc solid; padding: 0.3em 1em; margin: 1em; } div.note { border-color: #fcc200; } /* * The following styles are from Docutils. * Please refine if necessary. */ table.borderless td, table.borderless th { /* Override padding for "table.docutils td" with "! important". The right padding separates the table cells. */ padding: 0 0.5em 0 0 ! important; } .hidden { display: none; } blockquote.epigraph { margin: 2em 5em; } div.abstract { margin: 2em 5em; } div.dedication { margin: 2em 5em; text-align: center; font-style: italic; } div.figure { margin-left: 2em; margin-right: 2em; } div.footer, div.header { clear: both; font-size: smaller; } div.line-block { display: block; margin-top: 1em; margin-bottom: 1em; } div.line-block div.line-block { margin-top: 0; margin-bottom: 0; margin-left: 1.5em; } div.sidebar { margin: 0 0 0.5em 1em; border: medium outset; padding: 1em; background-color: #ffffee; width: 40%; float: right; clear: right; } div.sidebar p.rubric { font-family: sans-serif; font-size: medium; } div.system-messages { margin: 5em; } div.system-messages h1 { color: red; } div.system-message { border: medium outset; padding: 1em; } div.system-message p.system-message-title { color: red; font-weight: bold; } h1.section-subtitle, h2.section-subtitle, h3.section-subtitle, h4.section-subtitle, h5.section-subtitle, h6.section-subtitle { margin-top: 0.4em; } hr.docutils { width: 75%; } img.align-left { clear: left; } img.align-right { clear: right; } ol.simple, ul.simple { margin-bottom: 1em; } ol.arabic { list-style: decimal; } ol.loweralpha { list-style: lower-alpha; } ol.upperalpha { list-style: upper-alpha; } ol.lowerroman { list-style: lower-roman; } ol.upperroman { list-style: upper-roman; } p.attribution { text-align: right; margin-left: 50%; } p.caption { font-style: italic; } p.credits { font-style: italic; font-size: smaller; } p.label { white-space: nowrap; } p.rubric { font-weight: bold; font-size: larger; color: maroon; text-align: center; } pre.address { margin-bottom: 0; margin-top: 0; font-family: serif; font-size: 100%; } pre.literal-block, pre.doctest-block { margin-left: 2em; margin-right: 2em; } span.classifier { font-family: sans-serif; font-style: oblique; } span.classifier-delimiter { font-family: sans-serif; font-weight: bold; } span.interpreted { font-family: sans-serif; } span.option { white-space: nowrap; } span.pre { white-space: pre; } span.problematic { color: red; } span.section-subtitle { /* font-size relative to parent (h1..h6 element) */ font-size: 80%; } table.citation { border-left: solid 1px gray; margin-left: 1px; } table.footnote { border-left: solid 1px black; margin-left: 1px; } h1 tt.docutils, h2 tt.docutils, h3 tt.docutils, h4 tt.docutils, h5 tt.docutils, h6 tt.docutils { font-size: 100%; } ul.auto-toc { list-style-type: none; } div.contents.local { -moz-column-width: 10em; -moz-column-gap: 1em; -webkit-column-width: 10em; -webkit-column-gap: 1em; }