mirror of
https://github.com/johnkerl/miller.git
synced 2026-01-24 02:36:15 +00:00
249 lines
9.2 KiB
HTML
249 lines
9.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html lang="en">
|
|
|
|
<!-- PAGE GENERATED FROM template.html and content-for-performance.html BY poki. -->
|
|
<!-- PLEASE MAKE CHANGES THERE AND THEN RE-RUN poki. -->
|
|
<head>
|
|
<meta http-equiv="Content-type" content="text/html;charset=UTF-8"/>
|
|
<meta name="description" content="Miller documentation"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0"/> <!-- mobile-friendly -->
|
|
<meta name="keywords"
|
|
content="John Kerl, Kerl, Miller, miller, mlr, OLAP, data analysis software, regression, correlation, variance, data tools, " />
|
|
|
|
<title> Performance </title>
|
|
<link rel="stylesheet" type="text/css" href="css/miller.css"/>
|
|
<link rel="stylesheet" type="text/css" href="css/poki-callbacks.css"/>
|
|
</head>
|
|
|
|
<!-- ================================================================ -->
|
|
<script type="text/javascript">
|
|
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
|
|
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
|
|
</script>
|
|
<script type="text/javascript">
|
|
try {
|
|
var pageTracker = _gat._getTracker("UA-15651652-1");
|
|
pageTracker._trackPageview();
|
|
} catch(err) {}
|
|
</script>
|
|
|
|
<!-- ================================================================ -->
|
|
<script type="text/javascript">
|
|
function toggle_div(div) {
|
|
if (div != null) {
|
|
if (div.id.startsWith("section_toggle_")) {
|
|
var state = div.style.display;
|
|
if (state == "block") {
|
|
div.style.display = "none";
|
|
} else {
|
|
div.style.display = "block";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
function expand_div(div) {
|
|
if (div != null) {
|
|
if (div.id.startsWith("section_toggle_")) {
|
|
div.style.display = "block";
|
|
}
|
|
}
|
|
}
|
|
function collapse_div(div) {
|
|
if (div != null) {
|
|
if (div.id.startsWith("section_toggle_")) {
|
|
div.style.display = "none";
|
|
}
|
|
}
|
|
}
|
|
|
|
function toggle_by_name(divName) {
|
|
toggle_div(document.getElementById(divName));
|
|
}
|
|
function expand_by_name(divName) {
|
|
expand_div(document.getElementById(divName));
|
|
}
|
|
function collapse_by_name(divName) {
|
|
collapse_div(document.getElementById(divName));
|
|
}
|
|
|
|
function expand_all() {
|
|
var divs = document.getElementsByTagName("div");
|
|
for(var i = 0; i < divs.length; i++) {
|
|
expand_div(divs[i]);
|
|
}
|
|
}
|
|
function collapse_all() {
|
|
var divs = document.getElementsByTagName("div");
|
|
for(var i = 0; i < divs.length; i++){
|
|
collapse_div(divs[i]);
|
|
}
|
|
}
|
|
</script>
|
|
|
|
<!--
|
|
The background image is from a screenshot of a Google search for "data analysis
|
|
tools", lightened and sepia-toned. Over this was placed a Mac Terminal app with
|
|
very light-grey font and translucent background, in which a few statistical
|
|
Miller commands were run with pretty-print-tabular output format.
|
|
<body background="pix/sepia-overlay.jpg">
|
|
-->
|
|
<body bgcolor="#ffffff">
|
|
|
|
<!-- ================================================================ -->
|
|
<table width="100%">
|
|
<tr>
|
|
|
|
<!-- navbar -->
|
|
<td width="15%">
|
|
<!--
|
|
<img src="pix/mlr.jpg" />
|
|
<img style="border-width:1px; color:black;" src="pix/mlr.jpg" />
|
|
-->
|
|
|
|
<div class="pokinav">
|
|
<center><titleinbody>Miller</titleinbody></center>
|
|
|
|
<!-- PAGE LIST GENERATED FROM template.html BY poki -->
|
|
<br/><b>Overview:</b>
|
|
<br/>• <a href="index.html">About Miller</a>
|
|
<br/>• <a href="10-min.html">Miller in 10 minutes</a>
|
|
<br/>• <a href="file-formats.html">File formats</a>
|
|
<br/>• <a href="feature-comparison.html">Miller features in the context of the Unix toolkit</a>
|
|
<br/>• <a href="record-heterogeneity.html">Record-heterogeneity</a>
|
|
<br/>• <a href="internationalization.html">Internationalization</a>
|
|
<br/><b>Using Miller:</b>
|
|
<br/>• <a href="faq.html">FAQ</a>
|
|
<br/>• <a href="cookbook.html">Cookbook part 1</a>
|
|
<br/>• <a href="cookbook2.html">Cookbook part 2</a>
|
|
<br/>• <a href="cookbook3.html">Cookbook part 3</a>
|
|
<br/>• <a href="data-examples.html">Data-diving examples</a>
|
|
<br/>• <a href="manpage.html">Manpage</a>
|
|
<br/>• <a href="reference.html">Reference</a>
|
|
<br/>• <a href="reference-verbs.html">Reference: Verbs</a>
|
|
<br/>• <a href="reference-dsl.html">Reference: DSL</a>
|
|
<br/>• <a href="release-docs.html">Documents by release</a>
|
|
<br/>• <a href="build.html">Installation, portability, dependencies, and testing</a>
|
|
<br/><b>Background:</b>
|
|
<br/>• <a href="why.html">Why?</a>
|
|
<br/>• <a href="whyc.html">Why C?</a>
|
|
<br/>• <a href="etymology.html">Why call it Miller?</a>
|
|
<br/>• <a href="originality.html">How original is Miller?</a>
|
|
<br/>• <a href="performance.html"><b>Performance</b></a>
|
|
<br/><b>Repository:</b>
|
|
<br/>• <a href="to-do.html">Things to do</a>
|
|
<br/>• <a href="contact.html">Contact information</a>
|
|
<br/>• <a href="https://github.com/johnkerl/miller">GitHub repo</a>
|
|
<br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/>
|
|
<br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/> <br/>
|
|
<br/> <br/> <br/> <br/> <br/> <br/>
|
|
</div>
|
|
</td>
|
|
|
|
<!-- page body -->
|
|
<td>
|
|
<!--
|
|
This is a visually gorgeous feature (here & in the CSS): it allows for
|
|
independent scroll of the nav and body panels. In particular the nav
|
|
stays on-screen as you scroll the body.
|
|
|
|
However, two problems:
|
|
|
|
(1) In Firefox & Chrome both I get janky end-of-body scrolls: there is
|
|
more content but I can't scroll down to it unless I repeatedly retry the
|
|
scrolldown. Which is weird.
|
|
|
|
(2) Worse, only the first page renders in PDF (again, Firefox & Chrome).
|
|
|
|
For now I'm disabling this separate-scroll feature. A frontender, I am
|
|
not ... maybe someday I'll find a config which gets *all* the features
|
|
I want; for now, it's a tradeoff.
|
|
-->
|
|
|
|
<!-- Implementation details: one bit is right here:
|
|
|
|
div style="overflow-y:scroll;height:1500px"
|
|
|
|
and the other bit is in css/poki-callbacks.css:
|
|
|
|
.pokinav {
|
|
display: inline-block;
|
|
background: #e8d9bc;
|
|
border: 1;
|
|
box-shadow: 0px 0px 3px 3px #C9C9C9;
|
|
margin: 10px;
|
|
padding-top: 10px;
|
|
padding-bottom: 10px;
|
|
padding-left: 10px;
|
|
padding-right: 10px;
|
|
overflow-y: scroll; < - - - - - - here
|
|
height: 1500px;
|
|
}
|
|
|
|
-->
|
|
<div>
|
|
<center> <titleinbody> Performance </titleinbody> </center>
|
|
<p/>
|
|
|
|
<!-- BODY COPIED FROM content-for-performance.html BY poki -->
|
|
<div class="pokitoc">
|
|
<center><b>Contents:</b></center>
|
|
• <a href="#Disclaimer">Disclaimer</a><br/>
|
|
• <a href="#Summary">Summary</a><br/>
|
|
</div>
|
|
<p/>
|
|
|
|
<p/>
|
|
<button style="font-weight:bold;color:maroon;border:0" onclick="expand_all();" href="javascript:;">Expand all sections</button>
|
|
<button style="font-weight:bold;color:maroon;border:0" onclick="collapse_all();" href="javascript:;">Collapse all sections</button>
|
|
|
|
<a id="Disclaimer"/><h1>Disclaimer</h1>
|
|
|
|
In a previous version of this page (see <a
|
|
href="http://johnkerl.org/miller-releases/miller-5.1.0/doc/performance.html">here</a>)
|
|
I compared Miller to some items in the Unix toolkit in terms of run time. But
|
|
such comparisons are very much not apples-to-apples:
|
|
|
|
<ul>
|
|
|
|
<li/> Miller’s principal strength is that it handles <b>key-value data in
|
|
various formats</b> while the system tools <b>do not</b>. So if you time
|
|
<tt>mlr sort</tt> on a CSV file against system <tt>sort</tt>, it's not relevant
|
|
to say which is faster by how many percent — Miller will respect the
|
|
header line, leaving it in place, while the system sort will move it, sorting
|
|
it along with all the other header lines. This would be comparing the run times
|
|
of two programs produce different outputs. Likewise, <tt>awk</tt>
|
|
doesn’t respect header lines, although you can code up some CSV-handling
|
|
using <tt>if (NR==1) { ... } else { ... }</tt>. And that’s just CSV: I
|
|
don’t know any simple way to get <tt>sort</tt>, <tt>awk</tt>, etc. to
|
|
handle DKVP, JSON, etc. — which is the main rreason I wrote Miller.
|
|
|
|
<li/> <b>Implementations differ by platform</b>: one <tt>awk</tt> may be
|
|
fundamentally faster than another, and <tt>mawk</tt> has a very efficient
|
|
bytecode implementation — which handles positionally indexed data
|
|
far faster than Miller does.
|
|
|
|
<li/> The system <tt>sort</tt> command will, on some systems, handle
|
|
too-large-for-RAM datasets by spilling to disk; Miller (as of version 5.2.0,
|
|
mid-2017) does not. Miller sorts are always stable; GNU supports stable and
|
|
unstable variants.
|
|
|
|
<li/> Etc.
|
|
|
|
</ul>
|
|
|
|
<a id="Summary"/><h1>Summary</h1>
|
|
|
|
<p/> Miller can do many kinds of processing on key-value-pair data using
|
|
elapsed time roughly of the same order of magnitude as items in the Unix
|
|
toolkit can handle positionally indexed data. Specific results vary widely
|
|
by platform, implementation details, multi-core use (or not). Lastly,
|
|
specific special-purpose non-record-aware processing will run far faster
|
|
in <tt>grep</tt>, <tt>sed</tt>, etc.
|
|
|
|
</div>
|
|
</div>
|
|
</td>
|
|
|
|
</table>
|
|
</body>
|
|
</html>
|