25 Jan
2016
25 Jan
'16
3:30 p.m.
[Fokke de Jong]
I’m processing 32 sample-blocks at 48KHz but roughly
every 0,6
seconds I get a large spike in cpu usage. This cannot possibly be
explained by my algorithm, because the load should be pretty stable.
I am measuring cpu load by getting the time with
clock_gettime(CLOCK_MONOTONIC_RAW, timespec*) at the beginning and
end of each callback. When converted to a percentage my cpu load
hovers somewhere between 40 an 50% most of the time, but more or less
every 900 callbacks (0.8 seconds there is a spike of more than 100%.
Have you checked if your per-callback CPU time measurement and that
reported by getrusage(2) are in agreement?
Cheers, Tim