On 02/23/2016 02:50 PM, Jonathan E. Brickman wrote: > 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! > > So my primary question is, what is JACK DSP % usage, what are its > limiting factors? DSP load is ratio of time it takes to perform audio i/o and process that audio per cycle over the time between process cycles. e.g. you run jack at 256 frames/period, 48KHz. One process cycle is 5.5ms long. The time it takes to for jack do read/write audio from/to the soundcard, plus the time the two Yoshimi instances need to synthesize 256 samples of audio in your case would be about about 4.5ms. (85% of those 5.5ms). There are plenty of limiting factors to realtime operations on modern multi-taking systems. Raw CPU power is usually the least concern. http://manual.ardour.org/setting-up-your-system/the-right-computer-system-for-digital-audio/ is a starting point. best, robin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
