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    <p>Check out <a href="http://www.kernel.org/doc/man-pages/online/pages/man2/clock_gettime.2.html" rel="nofollow noreferrer"><code>clock_gettime</code></a>, which is a POSIX interface to high-resolution timers.</p> <p>If, having read the manpage, you're left wondering about the difference between <code>CLOCK_REALTIME</code> and <code>CLOCK_MONOTONIC</code>, see <a href="https://stackoverflow.com/questions/3523442/difference-between-clock-realtime-and-clock-monotonic">Difference between CLOCK_REALTIME and CLOCK_MONOTONIC?</a></p> <p>See the following page for a complete example: <a href="http://www.guyrutenberg.com/2007/09/22/profiling-code-using-clock_gettime/" rel="nofollow noreferrer">http://www.guyrutenberg.com/2007/09/22/profiling-code-using-clock_gettime/</a></p> <pre class="lang-cpp prettyprint-override"><code>#include &lt;iostream&gt; #include &lt;time.h&gt; using namespace std; timespec diff(timespec start, timespec end); int main() { timespec time1, time2; int temp; clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &amp;time1); for (int i = 0; i&lt; 242000000; i++) temp+=temp; clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &amp;time2); cout&lt;&lt;diff(time1,time2).tv_sec&lt;&lt;":"&lt;&lt;diff(time1,time2).tv_nsec&lt;&lt;endl; return 0; } timespec diff(timespec start, timespec end) { timespec temp; if ((end.tv_nsec-start.tv_nsec)&lt;0) { temp.tv_sec = end.tv_sec-start.tv_sec-1; temp.tv_nsec = 1000000000+end.tv_nsec-start.tv_nsec; } else { temp.tv_sec = end.tv_sec-start.tv_sec; temp.tv_nsec = end.tv_nsec-start.tv_nsec; } return temp; } </code></pre>
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    1. POHow to create a high resolution timer in Linux to measure program performance?
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    1. COJust so I'm clear about what I've read, can you give me an example on how you would use clock_gettime to find the time elapsed in nanoseconds?
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    2. CO@seljuq70: I've added a link to a complete example.
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    3. COThat should do it thanks!!!
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