Task to busy one CPU 100% for a period of time?

[darwinsurvivor at gmail.com]

Have you looked at the sysutils/stress utility? It may do what you need.


~Doug

On Tue, Jan 12, 2016 at 10:36 AM, Ian Smith <smithi at nimnet.asn.au> wrote:

> On Mon, 11 Jan 2016 15:38:32 -0500, kpneal at pobox.com wrote:
>  > On Mon, Jan 11, 2016 at 04:04:05PM +1100, Ian Smith wrote:
>  > > Thanks for your response.  However I don't do C, and really need to
> find
>  > > something out of the box that I can configure to run at 100% of one
> CPU
>  > > for a specified number of iterations, which will then run for a
> certain
>  > > amount of CPU time on my hardware, while always on the run queue.
>  >
>  > Won't this reproduce your results?
>  >
>  > Two compilations:
>  >
>  > /* main.c */
>  > int main() {
>  >    for (;;)
>  >       dummy_function();
>  >    /*NOTREACHED*/
>  >    return(0);
>  > }
>  >
>  > /* dummy.c */
>  > int dummy_function(void) {
>  >    return 0;
>  > }
>  >
>  > cc -c main.c
>  > cc -c dummy.c
>  > cc -o load1 main.o dummy.o
>  >
>  > One invocation of this program should consume an entire CPU and
> therefore
>  > raise the load average by 1.00. Run as many as you like.
>  >
>  > (The reason for the two compilations is to avoid having any compiler
>  > optimize away the for loop. Just to be safe.)
>
> Thankyou Kevin.  Works a treat, so far tested 8 at once, loadavg = 8.00
>
> I'll follow up hopefully tomorrow with results of a sh script to run a
> given number of instances for a given time, needing a bit more testing.
>
> cheers, Ian
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