> On 24 Aug, 2016, at 16:36, Simo Koivukoski <simo.koivuko...@pp.inet.fi> wrote:
> 
> Thanks for the great explanation! So there is no good way to follow CPU usage 
> when playing different MP3 files with MpegDec?

For a start, you could try a newer version of Peekaboo - apparently v1.6 still 
supports Classic MacOS.  It’s probably the best tool for the job.  Reading 
through its docs, I am reminded that applications are able to tell MacOS how 
often they want the “idle” events, from “immediately” all the way through to 
“never”.  Some applications say “immediately” when they don’t actually need 
that, and they’ll show up as 100% on Peekaboo - but later versions of Peekaboo 
are apparently able to override it.

Audio applications are a special case; they tend to do a lot of things at 
interrupt time, since the response time of the standard event system is not 
guaranteed in the slightest (again, *cooperative* multitasking).  I don’t know 
whether Peekaboo handles interrupt-time stuff at all.  However, it should be 
possible to *specifically* measure interrupt time using a program which 
measures how often idle events are received, or which repeatedly runs a short 
benchmark.

 - Jonathan Morton

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