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C语言获取系统和CPU信息.html
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<h2 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h2><p>使用<code>#include <sys/sysinfo.h></code>文件中的接口读取系统信息。</p>
<h2 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h2><pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><sys/sysinfo.h></span></span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token keyword">int</span> argc<span class="token punctuation">,</span> <span class="token keyword">char</span> <span class="token keyword">const</span><span class="token operator">*</span> argv<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"cpu processors %d, available cores %d.\n"</span><span class="token punctuation">,</span> <span class="token function">get_nprocs_conf</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token function">get_nprocs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>输出：</p>
<pre class="line-numbers language-shell" data-language="shell"><code class="language-shell">$ g++ main.cc
$ ./a.out
cpu processors <span class="token number">8</span>, available cores <span class="token number">8</span>.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>查看进程运行在哪个CPU核心，哪个NUMA节点</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><sched.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><iostream></span></span>
using namespace std<span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token keyword">int</span> argc<span class="token punctuation">,</span> <span class="token keyword">char</span> <span class="token keyword">const</span><span class="token operator">*</span> argv<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">unsigned</span> <span class="token keyword">int</span> cpu<span class="token punctuation">,</span> node<span class="token punctuation">;</span>
<span class="token function">getcpu</span><span class="token punctuation">(</span><span class="token operator">&</span>cpu<span class="token punctuation">,</span> <span class="token operator">&</span>node<span class="token punctuation">)</span><span class="token punctuation">;</span>
cout <span class="token operator"><<</span> <span class="token string">"cpu="</span> <span class="token operator"><<</span> cpu <span class="token operator"><<</span> <span class="token string">" node="</span> <span class="token operator"><<</span> node <span class="token operator"><<</span> endl<span class="token punctuation">;</span>
<span class="token comment">// cpu=4 node=0 , 当前进程运行在哪个CPU核心，哪个NUMA节点</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>输出：</p>
<pre class="line-numbers language-shell" data-language="shell"><code class="language-shell">$ g++ main.cc
$ ./a.out
<span class="token assign-left variable">cpu</span><span class="token operator">=</span><span class="token number">2</span> <span class="token assign-left variable">node</span><span class="token operator">=</span><span class="token number">0</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<h2 id="其他"><a href="#其他" class="headerlink" title="其他"></a>其他</h2><p>头文件<code>#include <sys/sysinfo.h></code>中的其他接口</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">ifndef</span> <span class="token expression">_SYS_SYSINFO_H</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">_SYS_SYSINFO_H</span> <span class="token expression"><span class="token number">1</span></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><features.h></span></span>
<span class="token comment">/* Get sysinfo structure from kernel header. */</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><linux/kernel.h></span></span>
__BEGIN_DECLS
<span class="token comment">/* Returns information on overall system statistics. */</span>
<span class="token keyword">extern</span> <span class="token keyword">int</span> <span class="token function">sysinfo</span> <span class="token punctuation">(</span><span class="token keyword">struct</span> <span class="token class-name">sysinfo</span> <span class="token operator">*</span>__info<span class="token punctuation">)</span> __THROW<span class="token punctuation">;</span>
<span class="token comment">/* Return number of configured processors. */</span>
<span class="token keyword">extern</span> <span class="token keyword">int</span> <span class="token function">get_nprocs_conf</span> <span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span> __THROW<span class="token punctuation">;</span>
<span class="token comment">/* Return number of available processors. */</span>
<span class="token keyword">extern</span> <span class="token keyword">int</span> <span class="token function">get_nprocs</span> <span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span> __THROW<span class="token punctuation">;</span>
<span class="token comment">/* Return number of physical pages of memory in the system. */</span>
<span class="token keyword">extern</span> <span class="token keyword">long</span> <span class="token keyword">int</span> <span class="token function">get_phys_pages</span> <span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span> __THROW<span class="token punctuation">;</span>
<span class="token comment">/* Return number of available physical pages of memory in the system. */</span>
<span class="token keyword">extern</span> <span class="token keyword">long</span> <span class="token keyword">int</span> <span class="token function">get_avphys_pages</span> <span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span> __THROW<span class="token punctuation">;</span>
__END_DECLS
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">endif</span> <span class="token comment">/* sys/sysinfo.h */</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token keyword">struct</span> <span class="token class-name">sysinfo</span> <span class="token punctuation">{</span>
__kernel_long_t uptime<span class="token punctuation">;</span> <span class="token comment">/* Seconds since boot */</span>
__kernel_ulong_t loads<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">;</span> <span class="token comment">/* 1, 5, and 15 minute load averages */</span>
__kernel_ulong_t totalram<span class="token punctuation">;</span> <span class="token comment">/* Total usable main memory size */</span>
__kernel_ulong_t freeram<span class="token punctuation">;</span> <span class="token comment">/* Available memory size */</span>
__kernel_ulong_t sharedram<span class="token punctuation">;</span> <span class="token comment">/* Amount of shared memory */</span>
__kernel_ulong_t bufferram<span class="token punctuation">;</span> <span class="token comment">/* Memory used by buffers */</span>
__kernel_ulong_t totalswap<span class="token punctuation">;</span> <span class="token comment">/* Total swap space size */</span>
__kernel_ulong_t freeswap<span class="token punctuation">;</span> <span class="token comment">/* swap space still available */</span>
__u16 procs<span class="token punctuation">;</span> <span class="token comment">/* Number of current processes */</span>
__u16 pad<span class="token punctuation">;</span> <span class="token comment">/* Explicit padding for m68k */</span>
__kernel_ulong_t totalhigh<span class="token punctuation">;</span> <span class="token comment">/* Total high memory size */</span>
__kernel_ulong_t freehigh<span class="token punctuation">;</span> <span class="token comment">/* Available high memory size */</span>
__u32 mem_unit<span class="token punctuation">;</span> <span class="token comment">/* Memory unit size in bytes */</span>
<span class="token keyword">char</span> _f<span class="token punctuation">[</span><span class="token number">20</span><span class="token operator">-</span><span class="token number">2</span><span class="token operator">*</span><span class="token keyword">sizeof</span><span class="token punctuation">(</span>__kernel_ulong_t<span class="token punctuation">)</span><span class="token operator">-</span><span class="token keyword">sizeof</span><span class="token punctuation">(</span>__u32<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">;</span> <span class="token comment">/* Padding: libc5 uses this.. */</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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