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POHow can I check how many times a function was called with a 3 seconds interval?
 

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  1. POHow can I check how many times a function was called with a 3 seconds interval?
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    <p>I would like to check how many times my function can be run in 3 seconds. I wrote that code:</p> <pre><code>#include &lt;string.h&gt; #include &lt;stdlib.h&gt; #include &lt;stdio.h&gt; #include &lt;time.h&gt; #include &lt;sys/time.h&gt; #include &lt;sys/resource.h&gt; double get_wall_time(){ struct timeval time; if (gettimeofday(&amp;time,NULL)){ // Handle error return 0; } return (double)time.tv_sec + (double)time.tv_usec * .000001; } int main(int argc, char **argv) { long iterations = 0; double seconds = 3.0; double wall0 = get_wall_time(), now; do { fun(a,b,c); now = get_wall_time(); iterations++; }while(now &lt; wall0+seconds); printf("%lu\n", iterations); return 0; } </code></pre> <p>But something tells me its not ok at all... I compared results with an executable from my teacher and turned out that his program does more iterations than mine in the same, 3-seconds time interval (<code>fun</code> is defined the same, teacher gave me its source, I only use it here).</p> <p>EDIT:</p> <p>Edited <code>while</code> loop but results still the same:</p> <pre><code> do { fun(a,b,c); iterations++; }while(get_wall_time() &lt; wall0+seconds); </code></pre> <p>EDIT:</p> <p>something like this? :</p> <pre><code>#include &lt;stdlib.h&gt; #include &lt;stdio.h&gt; #include &lt;signal.h&gt; #include &lt;unistd.h&gt; /* 3 seconds */ volatile int seconds = 3; void handle(int sig) { --seconds; alarm(1); } int main() { signal(SIGALRM, handle); alarm(1); while(seconds) { fun(a,b,c); iterations++; } printf("%lu\n", iterations); return 0; } </code></pre>
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      1. POHow can I check how many times a function was called with a 3 seconds interval?
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    1. COYour code is not just measuring how many times your function is called in 3 seconds. You're measuring the number of times you can call your function AND get_wall_time.
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      1. POHow can I check how many times a function was called with a 3 seconds interval?
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    2. CO@hatchet: ok, changed my `while` to `}while(get_wall_time() < wall0+seconds);` but still ... results aren't ok (are almost the same as they were before i changed it)
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      1. POHow can I check how many times a function was called with a 3 seconds interval?
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    3. COthat's still going to call get_wall_time for each execution of your function.
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      1. POHow can I check how many times a function was called with a 3 seconds interval?
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