[fpc-pascal] How to find where my app consumes CPU?

[Travis Siegel]

No doubt your sleep code works just fine.

I'm not saying the sleep command doesn't work.

I'm saying the sleep command doesn't release unused cpu cycles for other 
threads/programs to use.

Apparently, if you want that behavior, you need to yield the cpu time 
your process would otherwise take, that's done with a different kernel 
function than sleep.

Alexander hit the nail on the head though with his solution, so I'm 
satisfied that the original poster got what he needed, and I learned 
something new about linux processes as well, which makes for a good all 
around solution.

On 5/19/2021 6:02 AM, Mattias Gaertner wrote:
> On Tue, 18 May 2021 18:37:38 -0400
> Travis Siegel via fpc-pascal <fpc-pascal at lists.freepascal.org> wrote:
>
>> Apparently, you can release cpu cycles, but it's with the sched_yield
>> (section 2 in the man pages), not the sleep command on linux.
> What sleep command are you referring to?
> What do you mean with cpu cycles?
>
> Sleep works pretty well under Linux:
>
> uses sysutils;
> var i: integer;
> begin
>    for i:=1 to 10000 do sleep(1);
> end.
>
> time ./test1
>
> real	0m10,791s
> user	0m0,021s
> sys	0m0,018s
>
> Mattias