<div dir="ltr"><div>Every N msecs, your audio interface wakes up the CPU to tell it to read and write X samples of audio data. The CPU (and the OS) in turn wakes up JACK to tell it do the same, along with any other processing that is part of that.<br><br></div><div>If it takes JACK N msecs to finish the task, the DSP load is 100%.<br></div><div>If it takes JACK 0.0000001 msecs to finish the task, the DSP load is very close to 0%.<br></div><div>If it takes JACK N/2 msecs to finish the task, the DSP load is 50%.<br><br></div><div>Values about 80% appear unstable/unusable on all 3 of Linux, OS X and Windows.<br><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 23, 2016 at 8:50 AM, Jonathan E. Brickman <span dir="ltr"><<a href="mailto:jeb@ponderworthy.com" target="_blank">jeb@ponderworthy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
Eight-core, 4GHz AMD, 8G RAM. Running a lot of things all at once,
60 high-demand tones out of two Yoshimis (120 total), JACK DSP %
usage is 85%, but CPU usage through htop is a different thing, one
CPU is being kept by one Yoshimi at 64%, the rest less than 15% and
some down to 1-2%. JACK is not stressing any CPU!<br>
<br>
So my primary question is, what is JACK DSP % usage, what are its
limiting factors? <br><span class="HOEnZb"><font color="#888888">
<br>
<div>-- <br>
<div style="color:#993300;font-size:0.8em;font-style:italic">
Jonathan E. Brickman <a href="mailto:jeb@ponderworthy.com" target="_blank">jeb@ponderworthy.com</a> <a href="tel:%28785%29233-9977" value="+17852339977" target="_blank">(785)233-9977</a><br>
Hear us at <a href="http://ponderworthy.com" target="_blank">http://ponderworthy.com</a>
-- CDs and MP3 <a href="http://ponderworthy.com/ad-astra/ad-astra.html" target="_blank">now
available!</a><br>
Music of compassion; fire, and life!!!
</div>
</div>
</font></span></div>
<br>_______________________________________________<br>
Linux-audio-user mailing list<br>
<a href="mailto:Linux-audio-user@lists.linuxaudio.org">Linux-audio-user@lists.linuxaudio.org</a><br>
<a href="http://lists.linuxaudio.org/listinfo/linux-audio-user" rel="noreferrer" target="_blank">http://lists.linuxaudio.org/listinfo/linux-audio-user</a><br>
<br></blockquote></div><br></div>