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106 lines
4.3 KiB
HTML
106 lines
4.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual describes how to install and use the GNU multiple precision
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arithmetic library, version 6.1.0.
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Copyright 1991, 1993-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.3 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with the Front-Cover Texts being "A GNU Manual", and with the Back-Cover
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Texts being "You have freedom to copy and modify this GNU Manual, like GNU
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software". A copy of the license is included in
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GNU Free Documentation License. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Performance optimization (GNU MP 6.1.0)</title>
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<meta name="description" content="How to install and use the GNU multiple precision arithmetic library, version 6.1.0.">
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<meta name="keywords" content="Performance optimization (GNU MP 6.1.0)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="Installing-GMP.html#Installing-GMP" rel="up" title="Installing GMP">
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<link href="GMP-Basics.html#GMP-Basics" rel="next" title="GMP Basics">
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<link href="Known-Build-Problems.html#Known-Build-Problems" rel="prev" title="Known Build Problems">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Performance-optimization"></a>
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<div class="header">
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<p>
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Previous: <a href="Known-Build-Problems.html#Known-Build-Problems" accesskey="p" rel="prev">Known Build Problems</a>, Up: <a href="Installing-GMP.html#Installing-GMP" accesskey="u" rel="up">Installing GMP</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Performance-optimization-1"></a>
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<h3 class="section">2.6 Performance optimization</h3>
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<a name="index-Optimizing-performance"></a>
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<p>For optimal performance, build GMP for the exact CPU type of the target
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computer, see <a href="Build-Options.html#Build-Options">Build Options</a>.
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</p>
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<p>Unlike what is the case for most other programs, the compiler typically
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doesn’t matter much, since GMP uses assembly language for the most critical
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operation.
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</p>
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<p>In particular for long-running GMP applications, and applications demanding
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extremely large numbers, building and running the <code>tuneup</code> program in the
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<samp>tune</samp> subdirectory, can be important. For example,
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</p>
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<div class="example">
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<pre class="example">cd tune
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make tuneup
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./tuneup
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</pre></div>
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<p>will generate better contents for the <samp>gmp-mparam.h</samp> parameter file.
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</p>
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<p>To use the results, put the output in the file indicated in the
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‘<samp>Parameters for ...</samp>’ header. Then recompile from scratch.
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</p>
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<p>The <code>tuneup</code> program takes one useful parameter, ‘<samp>-f NNN</samp>’, which
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instructs the program how long to check FFT multiply parameters. If you’re
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going to use GMP for extremely large numbers, you may want to run <code>tuneup</code>
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with a large NNN value.
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</p>
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</body>
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</html>
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