Date: Tue, 12 Jan 2016 13:02:26 -0800 From: "darwinsurvivor@gmail.com" <darwinsurvivor@gmail.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: kpneal@pobox.com, "William A. Mahaffey III" <wam@hiwaay.net>, freebsd-questions@freebsd.org Subject: Re: Task to busy one CPU 100% for a period of time? Message-ID: <CAMuYtRDoKfGC0awAon1%2BBmUKsj6ugau-umgzCiR8MpbA37QTgQ@mail.gmail.com> In-Reply-To: <20160113052558.R93547@sola.nimnet.asn.au> References: <20160111002439.Q93547@sola.nimnet.asn.au> <56928802.2040802@hiwaay.net> <20160111154616.G93547@sola.nimnet.asn.au> <20160111203832.GC88498@neutralgood.org> <20160113052558.R93547@sola.nimnet.asn.au>
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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@nimnet.asn.au> wrote:
> On Mon, 11 Jan 2016 15:38:32 -0500, kpneal@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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