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Elias Schriefer
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="List of all items in this crate"><meta name="keywords" content="rust, rustlang, rust-lang"><title>List of all items in this crate</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<span class="in-band">List of all items</span></h1><h3 id="Functions">Functions</h3><ul class="functions docblock"><li><a href="fn.get.html">get</a></li><li><a href="fn.get_physical.html">get_physical</a></li></ul></section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../";window.currentCrate = "num_cpus";</script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `get` fn in crate `num_cpus`."><meta name="keywords" content="rust, rustlang, rust-lang, get"><title>num_cpus::get - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
<link rel="alternate icon" type="image/png" href="../favicon-16x16.png">
<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../num_cpus/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="index.html">num_cpus</a></p><script>window.sidebarCurrent = {name: "get", ty: "fn", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><span class="help-button">?</span>
<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/num_cpus/lib.rs.html#72-74" title="goto source code">[src]</a></span><span class="in-band">Function <a href="index.html">num_cpus</a>::<wbr><a class="fn" href="">get</a></span></h1><pre class="rust fn">pub fn get() -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></pre><div class="docblock"><p>Returns the number of available CPUs of the current system.</p>
<p>This function will get the number of logical cores. Sometimes this is different from the number
of physical cores (See <a href="https://en.wikipedia.org/wiki/Simultaneous_multithreading">Simultaneous multithreading on Wikipedia</a>).</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">cpus</span> <span class="op">=</span> <span class="ident">num_cpus</span>::<span class="ident">get</span>();
<span class="kw">if</span> <span class="ident">cpus</span> <span class="op">&gt;</span> <span class="number">1</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;We are on a multicore system with {} CPUs&quot;</span>, <span class="ident">cpus</span>);
} <span class="kw">else</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;We are on a single core system&quot;</span>);
}</pre></div>
<h1 id="note" class="section-header"><a href="#note">Note</a></h1>
<p>This will check <a href="http://www.gnu.org/software/libc/manual/html_node/CPU-Affinity.html">sched affinity</a> on Linux, showing a lower number of CPUs if the current
thread does not have access to all the computer's CPUs.</p>
<p>This will also check <a href="https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt">cgroups</a>, frequently used in containers to constrain CPU usage.</p>
</div></section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../";window.currentCrate = "num_cpus";</script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `get_physical` fn in crate `num_cpus`."><meta name="keywords" content="rust, rustlang, rust-lang, get_physical"><title>num_cpus::get_physical - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/num_cpus/lib.rs.html#105-107" title="goto source code">[src]</a></span><span class="in-band">Function <a href="index.html">num_cpus</a>::<wbr><a class="fn" href="">get_physical</a></span></h1><pre class="rust fn">pub fn get_physical() -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></pre><div class="docblock"><p>Returns the number of physical cores of the current system.</p>
<h1 id="note" class="section-header"><a href="#note">Note</a></h1>
<p>Physical count is supported only on Linux, mac OS and Windows platforms.
On other platforms, or if the physical count fails on supported platforms,
this function returns the same as <a href="fn.get.html"><code>get()</code></a>, which is the number of logical
CPUS.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">logical_cpus</span> <span class="op">=</span> <span class="ident">num_cpus</span>::<span class="ident">get</span>();
<span class="kw">let</span> <span class="ident">physical_cpus</span> <span class="op">=</span> <span class="ident">num_cpus</span>::<span class="ident">get_physical</span>();
<span class="kw">if</span> <span class="ident">logical_cpus</span> <span class="op">&gt;</span> <span class="ident">physical_cpus</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;We have simultaneous multithreading with about {:.2} \
logical cores to 1 physical core.&quot;</span>,
(<span class="ident">logical_cpus</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">physical_cpus</span> <span class="kw">as</span> <span class="ident">f64</span>));
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">logical_cpus</span> <span class="op">=</span><span class="op">=</span> <span class="ident">physical_cpus</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Either we don&#39;t have simultaneous multithreading, or our \
system doesn&#39;t support getting the number of physical CPUs.&quot;</span>);
} <span class="kw">else</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;We have less logical CPUs than physical CPUs, maybe we only have access to \
some of the CPUs on our system.&quot;</span>);
}</pre></div>
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `num_cpus` crate."><meta name="keywords" content="rust, rustlang, rust-lang, num_cpus"><title>num_cpus - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
<link rel="alternate icon" type="image/png" href="../favicon-16x16.png">
<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../num_cpus/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Crate num_cpus</p><div class="block version"><p>Version 1.13.0</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all num_cpus's items</p></a><div class="block items"><ul><li><a href="#functions">Functions</a></li></ul></div><p class="location"></p><script>window.sidebarCurrent = {name: "num_cpus", ty: "mod", relpath: "../"};</script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><span class="help-button">?</span>
<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/num_cpus/lib.rs.html#1-456" title="goto source code">[src]</a></span><span class="in-band">Crate <a class="mod" href="">num_cpus</a></span></h1><div class="docblock"><p>A crate with utilities to determine the number of CPUs available on the
current system.</p>
<p>Sometimes the CPU will exaggerate the number of CPUs it contains, because it can use
<a href="https://en.wikipedia.org/wiki/Simultaneous_multithreading">processor tricks</a> to deliver increased performance when there are more threads. This
crate provides methods to get both the logical and physical numbers of cores.</p>
<p>This information can be used as a guide to how many tasks can be run in parallel.
There are many properties of the system architecture that will affect parallelism,
for example memory access speeds (for all the caches and RAM) and the physical
architecture of the processor, so the number of CPUs should be used as a rough guide
only.</p>
<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
<p>Fetch the number of logical CPUs.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">cpus</span> <span class="op">=</span> <span class="ident">num_cpus</span>::<span class="ident">get</span>();</pre></div>
<p>See <a href="https://docs.rs/rayon/1.*/rayon/struct.ThreadPool.html"><code>rayon::Threadpool</code></a> for an example of where the number of CPUs could be
used when setting up parallel jobs (Where the threadpool example uses a fixed
number 8, it could use the number of CPUs).</p>
</div><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
<table><tr class="module-item"><td><a class="fn" href="fn.get.html" title="num_cpus::get fn">get</a></td><td class="docblock-short"><p>Returns the number of available CPUs of the current system.</p>
</td></tr><tr class="module-item"><td><a class="fn" href="fn.get_physical.html" title="num_cpus::get_physical fn">get_physical</a></td><td class="docblock-short"><p>Returns the number of physical cores of the current system.</p>
</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../";window.currentCrate = "num_cpus";</script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>

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initSidebarItems({"fn":[["get","Returns the number of available CPUs of the current system."],["get_physical","Returns the number of physical cores of the current system."]]});