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25 lines
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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">−</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() -> <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>
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<h1 id="note" class="section-header"><a href="#note">Note</a></h1>
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<p>Physical count is supported only on Linux, mac OS and Windows platforms.
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On other platforms, or if the physical count fails on supported platforms,
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this function returns the same as <a href="fn.get.html"><code>get()</code></a>, which is the number of logical
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CPUS.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<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>();
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<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>();
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<span class="kw">if</span> <span class="ident">logical_cpus</span> <span class="op">></span> <span class="ident">physical_cpus</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"We have simultaneous multithreading with about {:.2} \
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logical cores to 1 physical core."</span>,
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(<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>));
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} <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> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Either we don't have simultaneous multithreading, or our \
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system doesn't support getting the number of physical CPUs."</span>);
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} <span class="kw">else</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"We have less logical CPUs than physical CPUs, maybe we only have access to \
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some of the CPUs on our system."</span>);
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}</pre></div>
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