Re: [Jack-Devel] jack dsp load calculation

On Sat, December 26, 2015 10:11 am, Kjetil Matheussen wrote:
>> One thing I'm not quite sure of, which is always apparent because all
>> the
>> > values are visible, is why there is such a large difference between
>> > minimum and maximum CPU usage. It's usually at least 4-10
>> > percentage points. I hope it's because of measurement
>> > errors.
>>
> Just calling clock_gettime(CLOCK_MONOTONIC, &time) before and
> after processing audio locally in Radium. CPU numbers from jack is
> not shown in Radium.


Maybe I misunderstood, but if the quote above refers to the same operation
taking different amounts of time, couldn't that be explained by
preemption? Sometimes the DSP operation gets suspended for kernel
housekeeping, which results in the end of the DSP operation occurring
later than at other times when it does not get preempted?

-- 
Chris Caudle

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