148 lines
6.8 KiB
HTML
148 lines
6.8 KiB
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>num_cpus</a>::<wbr><a class="fn" href=''>get_physical</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/num_cpus/lib.rs.html#95-97' title='goto source code'>[src]</a></span></h1>
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<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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<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="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>
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