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    <p>From <code>man 5 proc</code>:</p> <blockquote> <pre><code> /proc/cpuinfo This is a collection of CPU and system architecture dependent items, for each supported architecture a different list. Two common entries are processor which gives CPU number and bogomips; a system constant that is calculated during kernel initialization. SMP machines have information for each CPU. </code></pre> </blockquote> <p>Here is sample code that reads and prints the info to console, <a href="http://www.linuxquestions.org/questions/programming-9/c-get-cmdline-from-proc-filesystem-772529/" rel="nofollow">stolen from forums</a> - It really is just a specialized <code>cat</code> command.</p> <pre><code>#define _GNU_SOURCE #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; int main(int argc, char **argv) { FILE *cpuinfo = fopen("/proc/cpuinfo", "rb"); char *arg = 0; size_t size = 0; while(getdelim(&amp;arg, &amp;size, 0, cpuinfo) != -1) { puts(arg); } free(arg); fclose(cpuinfo); return 0; } </code></pre> <p>Please note that you need to parse and compare the <code>physical id</code>, <code>core id</code> and <code>cpu cores</code> to get an accurate result, if you really care about the number of CPUs vs. CPU cores. Also please note that if there is a <code>htt</code> in <code>flags</code>, you are running a hyper-threading CPU, which means that your mileage may vary.</p> <p>Please also note that if you run your kernel in a virtual machine, you only see the CPU cores dedicated to the VM guest.</p>
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    1. POHow to get CPU info in C on Linux, such as number of cores?
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    1. USManuel Selva
    1. USKimvais
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    1. COCurious question. Who updates this file?
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    2. CO@RamBhat - it is not _file_ in general sense. See the Wikipedia [article about procfs](http://en.wikipedia.org/wiki/Procfs)
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    3. COI found this article very helpful, in terms of understanding the /proc/cpuinfo file - http://www.richweb.com/cpu_info
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