'TIME' task cpuuse

Matthew J Fletcher amimjf at gmail.com
Tue Jan 14 08:41:10 UTC 2020


So first step is to create a wrapper that all timers fire through, then an
array to count the number of invocations per timer_id, after that some per
timer_id time accounting.

Will let you know if its anything outside my application.

On Mon, 13 Jan 2020 at 15:01, Joel Sherrill <joel at rtems.org> wrote:

> On Mon, Jan 13, 2020 at 8:53 AM Matthew J Fletcher <amimjf at gmail.com>
> wrote:
>> Hi,
>> My application seems to be using around 1/3rd of its total cpu usage in
>> the 'TIME' task,. is this the task created by rtems_timer_initiate_server()
>> ?
> Yes.
>> What would be the best way to get more information,. are there console
>> commands that would emit more data, or do i need to instrument my
>> application to see usage of all rtems_timer_xx callbacks ?
> rtems_timer_server_xx would be the ones going to the TIME Server.
> But 1/3 seems quite excessive. I would assume one of your timer server
> routines is doing something unexpectedly heavy CPU-wise.
> I don't think there is any instrumentation in the server which would help.
> Measuring the execution time of each invocation is what comes to mind. My
> first thought is that this would be a nice debug option for timers. But I
> am not sure how good this would be for ISR style.
> --joel
>> regards
>> ---
>> Matthew J Fletcher
>> _______________________________________________
>> users mailing list
>> users at rtems.org
>> http://lists.rtems.org/mailman/listinfo/users


Matthew J Fletcher
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