Wow, this clears up an old mystery for me - thanks for starting this thread!
Another way to grab CPU power is to run "pd -nosleep" which causes it to spin instead of sleeping when it goes idle. On my system at least, I see the CPU immediately go to full speed. (But only do this on a system with more than one CPU. And I'm not sure how this will play with jack - I'm using Alsa directly.) cheers Miller On Sun, Dec 07, 2008 at 05:17:38PM +0100, Roman Haefeli wrote: > you might have guessed it, but for the sake of correctness: > > this is: > - linux / ubuntu hardy > - intel core 2 duo (800 -> 2401 MHz) > - pd vanilla 0.42 test5 > > > On Sun, 2008-12-07 at 16:58 +0100, Roman Haefeli wrote: > > hi all > > > > i encountered, that 'ondemand' cpu scaling doesn't work correctly when > > running pd with realtime priority. even if pd is using 80% or more > > resources (of one core), the cpu frequency is not raised and staying at > > 800MHz. i can force it to go up by running an instance of 'burnMMX' (or > > something else, that burns as many cycles as possible). when running pd > > with '-nrt', automatic scaling works fine. also, as a workaround, i can > > set the scaling_governor to 'userspace' and then set the cpu frequency > > manually. > > > > could it be, that when pd is running in realtime mode, its priority is > > higher then the one of the process, that controls the cpu frequency, so > > that cpu time is assigned rather to pd and only at times, when pd is not > > using it, the governor can adjust the frequency (which would be the > > loweset, since pd is not using much cpu at that time)? > > > > i wonder, what other people do in a performative situation? do you > > simply turn automatic scaling off and set frequency to the highest > > value? or is it only me having this issue? > > > > > > while we are at priorities: > > i figured out, that all four combinatios are possible: > > pd -rt, jackd -R > > pd -nrt, jackd -R > > pd -rt, jackd > > pd -nrt, jackd > > > > i guess, that the first one should be used for best performance, right? > > but how to set priorities between jackd and pd? can this be fine-tuned > > at all (i know you can fine-tune jackd) ? if so, which should have > > higher priority? > > > > roman > > > > > > > > > > > > ___________________________________________________________ > > Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de > > > > > > _______________________________________________ > > Pd-list@iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > > > > ___________________________________________________________ > Der fr?he Vogel f?ngt den Wurm. Hier gelangen Sie zum neuen Yahoo! Mail: > http://mail.yahoo.de > > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
