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<p>以前对如何看CPU个数和每个CPU是多少核的不太清楚，今天网上查了些资料,总算有些概念。查看CPU信息主要通过 /proc/cpuinfo 文件来查看，以下为该文件内容里的一些参数说明：</p>
<ul>
<li>processor ： 条目包括这一逻辑处理器的唯一标识符。 </li>
<li>physical id : 条目包括每个物理封装的唯一标识符。 </li>
<li>core id: 条目保存每个内核的唯一标识符。 </li>
<li>cpu cores 条目包含位于相同物理封装中的内核数量 </li>
<li>siblings 条目列出了位于相同物理封装中的逻辑处理器的数量。</li>
</ul>
<p>其中前四项经常用到。</p>
<figure class="highlight tcl"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">查看物理CPU个数 </span><br><span class="line">cat /<span class="keyword">proc</span>/cpuinfo |<span class="title"> grep</span> "physical<span class="title"> id"</span> |<span class="title"> sort</span> |<span class="title"> uniq</span> |<span class="title"> wc</span> -l</span><br><span class="line"></span><br><span class="line">查看逻辑CPU个数 </span><br><span class="line">cat /<span class="keyword">proc</span>/cpuinfo |<span class="title"> grep</span> "processor" |<span class="title"> sort</span> |<span class="title"> uniq</span> |<span class="title"> wc</span> -l</span><br></pre></td></tr></table></figure>
<p>/proc/cpuinfo文件信息<br><figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="string">processor :</span> <span class="number">0</span> --表示逻辑CPU </span><br><span class="line"><span class="string">vendor_id :</span> GenuineIntel </span><br><span class="line">cpu <span class="string">family :</span> <span class="number">6</span> </span><br><span class="line"><span class="string">model :</span> <span class="number">26</span> </span><br><span class="line">model <span class="string">name :</span> Intel(R) Xeon(R) CPU E5504 @ <span class="number">2.00</span>GHz </span><br><span class="line"><span class="string">stepping :</span> <span class="number">5</span> </span><br><span class="line">cpu <span class="string">MHz :</span> <span class="number">2000.119</span> </span><br><span class="line">cache <span class="string">size :</span> <span class="number">4096</span> KB </span><br><span class="line">physical <span class="string">id :</span> <span class="number">0</span>--表示物理CPU编号 </span><br><span class="line"><span class="string">siblings :</span> <span class="number">4</span> </span><br><span class="line">core <span class="string">id :</span> <span class="number">0</span> </span><br><span class="line">cpu <span class="string">cores :</span> <span class="number">4</span> --表示物理CPU有多少核 </span><br><span class="line"><span class="string">apicid :</span> <span class="number">0</span> </span><br><span class="line"><span class="string">fpu :</span> yes </span><br><span class="line"><span class="string">fpu_exception :</span> yes </span><br><span class="line">cpuid <span class="string">level :</span> <span class="number">11</span> </span><br><span class="line"><span class="string">wp :</span> yes </span><br><span class="line"><span class="string">flags :</span> fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm </span><br><span class="line"><span class="string">bogomips :</span> <span class="number">4000.23</span> </span><br><span class="line">clflush <span class="string">size :</span> <span class="number">64</span> </span><br><span class="line"><span class="string">cache_alignment :</span> <span class="number">64</span> </span><br><span class="line">address <span class="string">sizes :</span> <span class="number">40</span> bits physical, <span class="number">48</span> bits virtual </span><br><span class="line">power <span class="string">management:</span> [<span class="number">8</span>]</span><br><span class="line"> </span><br><span class="line">…..中间部分省略</span><br><span class="line"><span class="string">vendor_id :</span> GenuineIntel </span><br><span class="line">cpu <span class="string">family :</span> <span class="number">6</span> </span><br><span class="line"><span class="string">model :</span> <span class="number">26</span> </span><br><span class="line">model <span class="string">name :</span> Intel(R) Xeon(R) CPU E5504 @ <span class="number">2.00</span>GHz </span><br><span class="line"><span class="string">stepping :</span> <span class="number">5</span> </span><br><span class="line">cpu <span class="string">MHz :</span> <span class="number">2000.119</span> </span><br><span class="line">cache <span class="string">size :</span> <span class="number">4096</span> KB </span><br><span class="line">physical <span class="string">id :</span> <span class="number">1</span> </span><br><span class="line"><span class="string">siblings :</span> <span class="number">4</span> </span><br><span class="line">core <span class="string">id :</span> <span class="number">3</span> </span><br><span class="line">cpu <span class="string">cores :</span> <span class="number">4</span> </span><br><span class="line"><span class="string">apicid :</span> <span class="number">22</span> </span><br><span class="line"><span class="string">fpu :</span> yes </span><br><span class="line"><span class="string">fpu_exception :</span> yes </span><br><span class="line">cpuid <span class="string">level :</span> <span class="number">11</span> </span><br><span class="line"><span class="string">wp :</span> yes </span><br><span class="line"><span class="string">flags :</span> fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc nonstop_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm </span><br><span class="line"><span class="string">bogomips :</span> <span class="number">4000.11</span> </span><br><span class="line">clflush <span class="string">size :</span> <span class="number">64</span> </span><br><span class="line"><span class="string">cache_alignment :</span> <span class="number">64</span> </span><br><span class="line">address <span class="string">sizes :</span> <span class="number">40</span> bits physical, <span class="number">48</span> bits virtual </span><br><span class="line">power <span class="string">management:</span> [<span class="number">8</span>]</span><br></pre></td></tr></table></figure></p>
<p>从这个文件可以看出，有2个物理CPU，每颗4核。</p>
<p>另一种方法查看<br><figure class="highlight ldif"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line">[root@pc-zjndyh01 ~]<span class="comment"># lscpu</span></span><br><span class="line"><span class="attribute">Architecture</span>: x86_64</span><br><span class="line"><span class="attribute">CPU op-mode(s)</span>: 32-bit, 64-bit</span><br><span class="line"><span class="attribute">Byte Order</span>: Little Endian</span><br><span class="line"><span class="attribute">CPU(s)</span>: 32</span><br><span class="line"><span class="attribute">On-line CPU(s) list</span>: 0-31</span><br><span class="line"><span class="attribute">Thread(s) per core</span>: 1</span><br><span class="line"><span class="attribute">Core(s) per socket</span>: 8</span><br><span class="line"><span class="attribute">Socket(s)</span>: 4</span><br><span class="line"><span class="attribute">NUMA node(s)</span>: 8</span><br><span class="line"><span class="attribute">Vendor ID</span>: AuthenticAMD</span><br><span class="line"><span class="attribute">CPU family</span>: 16</span><br><span class="line"><span class="attribute">Model</span>: 9</span><br><span class="line"><span class="attribute">Stepping</span>: 1</span><br><span class="line"><span class="attribute">CPU MHz</span>: 2400.143</span><br><span class="line"><span class="attribute">BogoMIPS</span>: 4800.11</span><br><span class="line"><span class="attribute">Virtualization</span>: AMD-V</span><br><span class="line"><span class="attribute">L1d cache</span>: 64K</span><br><span class="line"><span class="attribute">L1i cache</span>: 64K</span><br><span class="line"><span class="attribute">L2 cache</span>: 512K</span><br><span class="line"><span class="attribute">L3 cache</span>: 5118K</span><br><span class="line"><span class="attribute">NUMA node0 CPU(s)</span>: 0,4,8,12</span><br><span class="line"><span class="attribute">NUMA node1 CPU(s)</span>: 16,20,24,28</span><br><span class="line"><span class="attribute">NUMA node2 CPU(s)</span>: 1,5,9,13</span><br><span class="line"><span class="attribute">NUMA node3 CPU(s)</span>: 17,21,25,29</span><br><span class="line"><span class="attribute">NUMA node4 CPU(s)</span>: 2,6,10,14</span><br><span class="line"><span class="attribute">NUMA node5 CPU(s)</span>: 18,22,26,30</span><br><span class="line"><span class="attribute">NUMA node6 CPU(s)</span>: 19,23,27,31</span><br><span class="line"><span class="attribute">NUMA node7 CPU(s)</span>: 3,7,11,15</span><br></pre></td></tr></table></figure></p>
<p>socket就代表cpu插槽，如果有8个socket那就是八路的</p>
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