413 lines
12 KiB
HTML
413 lines
12 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="generator" content="pandoc" />
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<meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="author" content="Thomas Lin Pedersen" />
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<title>Profiling Performance</title>
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<script>// Pandoc 2.9 adds attributes on both header and div. We remove the former (to
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// be compatible with the behavior of Pandoc < 2.8).
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document.addEventListener('DOMContentLoaded', function(e) {
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var hs = document.querySelectorAll("div.section[class*='level'] > :first-child");
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var i, h, a;
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for (i = 0; i < hs.length; i++) {
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h = hs[i];
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if (!/^h[1-6]$/i.test(h.tagName)) continue; // it should be a header h1-h6
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a = h.attributes;
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while (a.length > 0) h.removeAttribute(a[0].name);
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}
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});
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</script>
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<style type="text/css">
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code{white-space: pre-wrap;}
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span.smallcaps{font-variant: small-caps;}
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span.underline{text-decoration: underline;}
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div.column{display: inline-block; vertical-align: top; width: 50%;}
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div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
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ul.task-list{list-style: none;}
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</style>
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<style type="text/css">
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code {
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white-space: pre;
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}
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.sourceCode {
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overflow: visible;
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}
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</style>
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<style type="text/css" data-origin="pandoc">
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pre > code.sourceCode { white-space: pre; position: relative; }
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pre > code.sourceCode > span { line-height: 1.25; }
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pre > code.sourceCode > span:empty { height: 1.2em; }
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.sourceCode { overflow: visible; }
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code.sourceCode > span { color: inherit; text-decoration: inherit; }
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div.sourceCode { margin: 1em 0; }
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pre.sourceCode { margin: 0; }
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@media screen {
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div.sourceCode { overflow: auto; }
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}
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@media print {
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pre > code.sourceCode { white-space: pre-wrap; }
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pre > code.sourceCode > span { display: inline-block; text-indent: -5em; padding-left: 5em; }
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}
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pre.numberSource code
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{ counter-reset: source-line 0; }
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pre.numberSource code > span
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{ position: relative; left: -4em; counter-increment: source-line; }
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pre.numberSource code > span > a:first-child::before
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{ content: counter(source-line);
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position: relative; left: -1em; text-align: right; vertical-align: baseline;
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border: none; display: inline-block;
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-webkit-touch-callout: none; -webkit-user-select: none;
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-khtml-user-select: none; -moz-user-select: none;
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-ms-user-select: none; user-select: none;
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padding: 0 4px; width: 4em;
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color: #aaaaaa;
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}
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pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa; padding-left: 4px; }
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div.sourceCode
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{ }
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@media screen {
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pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
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}
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code span.al { color: #ff0000; font-weight: bold; }
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code span.an { color: #60a0b0; font-weight: bold; font-style: italic; }
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code span.at { color: #7d9029; }
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code span.bn { color: #40a070; }
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code span.bu { color: #008000; }
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code span.cf { color: #007020; font-weight: bold; }
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code span.cn { color: #880000; }
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code span.co { color: #60a0b0; font-style: italic; }
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code span.cv { color: #60a0b0; font-weight: bold; font-style: italic; }
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code span.do { color: #ba2121; font-style: italic; }
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code span.dt { color: #902000; }
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code span.dv { color: #40a070; }
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code span.er { color: #ff0000; font-weight: bold; }
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code span.ex { }
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code span.fl { color: #40a070; }
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code span.fu { color: #06287e; }
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code span.im { color: #008000; font-weight: bold; }
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code span.in { color: #60a0b0; font-weight: bold; font-style: italic; }
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code span.kw { color: #007020; font-weight: bold; }
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code span.op { color: #666666; }
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code span.ot { color: #007020; }
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code span.pp { color: #bc7a00; }
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code span.sc { color: #4070a0; }
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code span.ss { color: #bb6688; }
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code span.st { color: #4070a0; }
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code span.va { color: #19177c; }
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code span.vs { color: #4070a0; }
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code span.wa { color: #60a0b0; font-weight: bold; font-style: italic; }
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</style>
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<script>
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// apply pandoc div.sourceCode style to pre.sourceCode instead
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(function() {
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var sheets = document.styleSheets;
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for (var i = 0; i < sheets.length; i++) {
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if (sheets[i].ownerNode.dataset["origin"] !== "pandoc") continue;
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try { var rules = sheets[i].cssRules; } catch (e) { continue; }
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var j = 0;
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while (j < rules.length) {
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var rule = rules[j];
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// check if there is a div.sourceCode rule
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if (rule.type !== rule.STYLE_RULE || rule.selectorText !== "div.sourceCode") {
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j++;
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continue;
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}
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var style = rule.style.cssText;
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// check if color or background-color is set
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continue;
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}
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// replace div.sourceCode by a pre.sourceCode rule
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sheets[i].deleteRule(j);
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sheets[i].insertRule('pre.sourceCode{' + style + '}', j);
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}
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}
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})();
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</script>
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<style type="text/css">body {
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background-color: #fff;
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margin: 1em auto;
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max-width: 700px;
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overflow: visible;
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padding-left: 2em;
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padding-right: 2em;
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font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
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font-size: 14px;
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line-height: 1.35;
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}
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#TOC {
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clear: both;
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margin: 0 0 10px 10px;
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padding: 4px;
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width: 400px;
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border: 1px solid #CCCCCC;
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border-radius: 5px;
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background-color: #f6f6f6;
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font-size: 13px;
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line-height: 1.3;
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}
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#TOC .toctitle {
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font-weight: bold;
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font-size: 15px;
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margin-left: 5px;
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}
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#TOC ul {
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padding-left: 40px;
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margin-left: -1.5em;
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margin-top: 5px;
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margin-bottom: 5px;
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}
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#TOC ul ul {
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margin-left: -2em;
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}
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#TOC li {
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line-height: 16px;
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}
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table {
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margin: 1em auto;
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border-width: 1px;
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border-color: #DDDDDD;
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border-style: outset;
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border-collapse: collapse;
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}
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table th {
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border-width: 2px;
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padding: 5px;
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border-style: inset;
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}
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table td {
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border-width: 1px;
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border-style: inset;
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line-height: 18px;
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padding: 5px 5px;
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}
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table, table th, table td {
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border-left-style: none;
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border-right-style: none;
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}
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table thead, table tr.even {
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background-color: #f7f7f7;
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}
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p {
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margin: 0.5em 0;
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}
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blockquote {
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background-color: #f6f6f6;
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padding: 0.25em 0.75em;
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}
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hr {
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border-style: solid;
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border: none;
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border-top: 1px solid #777;
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margin: 28px 0;
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}
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dl {
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margin-left: 0;
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}
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dl dd {
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margin-bottom: 13px;
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margin-left: 13px;
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}
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dl dt {
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font-weight: bold;
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}
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ul {
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margin-top: 0;
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}
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ul li {
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list-style: circle outside;
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}
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ul ul {
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margin-bottom: 0;
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}
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pre, code {
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background-color: #f7f7f7;
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border-radius: 3px;
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color: #333;
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white-space: pre-wrap;
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}
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pre {
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border-radius: 3px;
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margin: 5px 0px 10px 0px;
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padding: 10px;
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}
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pre:not([class]) {
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background-color: #f7f7f7;
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}
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code {
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font-family: Consolas, Monaco, 'Courier New', monospace;
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font-size: 85%;
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}
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p > code, li > code {
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padding: 2px 0px;
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}
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div.figure {
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text-align: center;
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}
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img {
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background-color: #FFFFFF;
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padding: 2px;
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border: 1px solid #DDDDDD;
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border-radius: 3px;
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border: 1px solid #CCCCCC;
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margin: 0 5px;
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}
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h1 {
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margin-top: 0;
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font-size: 35px;
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line-height: 40px;
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}
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h2 {
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border-bottom: 4px solid #f7f7f7;
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padding-top: 10px;
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padding-bottom: 2px;
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font-size: 145%;
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}
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h3 {
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border-bottom: 2px solid #f7f7f7;
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padding-top: 10px;
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font-size: 120%;
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}
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h4 {
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border-bottom: 1px solid #f7f7f7;
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margin-left: 8px;
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font-size: 105%;
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}
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h5, h6 {
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border-bottom: 1px solid #ccc;
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font-size: 105%;
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}
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a {
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color: #0033dd;
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text-decoration: none;
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}
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a:hover {
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color: #6666ff; }
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a:visited {
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color: #800080; }
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a:visited:hover {
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color: #BB00BB; }
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a[href^="http:"] {
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text-decoration: underline; }
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a[href^="https:"] {
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text-decoration: underline; }
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code > span.kw { color: #555; font-weight: bold; }
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code > span.dt { color: #902000; }
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code > span.dv { color: #40a070; }
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code > span.bn { color: #d14; }
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code > span.fl { color: #d14; }
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code > span.ch { color: #d14; }
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code > span.st { color: #d14; }
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code > span.co { color: #888888; font-style: italic; }
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code > span.ot { color: #007020; }
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code > span.al { color: #ff0000; font-weight: bold; }
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code > span.fu { color: #900; font-weight: bold; }
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code > span.er { color: #a61717; background-color: #e3d2d2; }
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</style>
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</head>
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<body>
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<h1 class="title toc-ignore">Profiling Performance</h1>
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<h4 class="author">Thomas Lin Pedersen</h4>
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<p>In order to continuously monitor the performance of gtable the
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following piece of code is used to generate a profile and inspect
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it:</p>
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<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="fu">library</span>(ggplot2)</span>
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<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="fu">library</span>(profvis)</span>
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<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a></span>
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<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a>p <span class="ot"><-</span> <span class="fu">ggplot</span>(mtcars, <span class="fu">aes</span>(mpg, disp)) <span class="sc">+</span> </span>
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<span id="cb1-5"><a href="#cb1-5" tabindex="-1"></a> <span class="fu">geom_point</span>() <span class="sc">+</span> </span>
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<span id="cb1-6"><a href="#cb1-6" tabindex="-1"></a> <span class="fu">facet_grid</span>(gear<span class="sc">~</span>cyl)</span>
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<span id="cb1-7"><a href="#cb1-7" tabindex="-1"></a></span>
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||
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<span id="cb1-8"><a href="#cb1-8" tabindex="-1"></a>p_build <span class="ot"><-</span> <span class="fu">ggplot_build</span>(p)</span>
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<span id="cb1-9"><a href="#cb1-9" tabindex="-1"></a></span>
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<span id="cb1-10"><a href="#cb1-10" tabindex="-1"></a>profile <span class="ot"><-</span> <span class="fu">profvis</span>(<span class="cf">for</span> (i <span class="cf">in</span> <span class="fu">seq_len</span>(<span class="dv">100</span>)) <span class="fu">ggplot_gtable</span>(p_build))</span>
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<span id="cb1-11"><a href="#cb1-11" tabindex="-1"></a></span>
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<span id="cb1-12"><a href="#cb1-12" tabindex="-1"></a>profile</span></code></pre></div>
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<p>The use of an empty ggplot2 ensures that the profile is based on
|
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real-life use and includes complex gtable assembly. Profiles for old
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version are kept for reference and can be accessed at the <a href="https://github.com/r-lib/gtable/tree/master/vignettes/profilings">github
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repository</a>. Care should be taken in not comparing profiles across
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versions, as changes to code outside of gtable can have profound effect
|
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on the results. Thus, the intend of profiling is to identify bottlenecks
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in the implementation that are ripe for improvement, more then to
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quantify improvements to performance over time.</p>
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<div id="performance-focused-changes-across-versions" class="section level2">
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<h2>Performance focused changes across versions</h2>
|
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|
<p>To keep track of changes focused on improving the performance of
|
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|
|
gtable they are summarised below:</p>
|
||
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<div id="v0.3.6" class="section level3">
|
||
|
|
<h3>v0.3.6</h3>
|
||
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|
<p>Profiling results from gtable v0.2.0 identified a range of areas that
|
||
|
|
could be easily improved by fairly small code changes. These changes
|
||
|
|
resulted in roughly 20% decrease in running time on the profiling code
|
||
|
|
in general, while gtable related functions were between 50 and 80%
|
||
|
|
decrease in running time specifically.</p>
|
||
|
|
<ul>
|
||
|
|
<li><strong><code>data.frame</code> construction and indexing.</strong>
|
||
|
|
gtable now includes a minimal constructor that makes no input checking
|
||
|
|
used for working with the layout data frame. Further, indexing into the
|
||
|
|
layout data frame has been improved by either treating as a list
|
||
|
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internally or directly calling <code>.subset2</code></li>
|
||
|
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<li><strong>Input validation.</strong> <code>stopifnot()</code> was
|
||
|
|
identified as a bottleneck and has removed in favor of a standard
|
||
|
|
<code>if (...) stop()</code></li>
|
||
|
|
<li><strong>Dimension querying.</strong> The use of <code>nrow()</code>
|
||
|
|
and <code>ncol()</code> has internally been substituted for direct calls
|
||
|
|
to <code>length()</code> of the <code>heights</code> and
|
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|
|
<code>widths</code> unit vectors</li>
|
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</ul>
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</div>
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</div>
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