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Published 20 hours ago • verified publisher icon zamaudio

DSP spike when rolling transport (on OSX)

Open x42 opened this issue 7 years ago • 5 comments

forwarded report from http://mixbus.harrisonconsoles.com/forum/thread-3211-post-20992.html

x42 avatar Aug 22 '16 15:08 x42

I don't have a Mac to test, but could this be a graphics problem? The meter displays in ZaMultiCompX2 are quite heavy on CPU when showing a signal. It was using 120% CPU on my 4-core Debian amd64 system (issue #56) before I realised graphics hardware acceleration wasn't working (forgot to add user to video group on a non-systemd system). Just a thought.

Edit: Please ignore. Audio DSP load is not affected by graphics CPU load, as pointed out by x42.

jrigg avatar Jul 01 '19 13:07 jrigg

Thanks for the idea.

zamaudio avatar Jul 02 '19 05:07 zamaudio

John, is DSP load also spiking on your machine? Does it also happen when the GUI is not visible?

The UI is a low priority thread, it can increase CPU load, but it won't interfere with DSP, nor cause x-runs.

x42 avatar Jul 02 '19 13:07 x42

Robin, you are indeed correct. I was thinking of "DSP" as all DSP including video, which of course is wrong in this context.

DSP load as reported by jack clients does not increase above normal when graphics hardware acceleration is turned off, nor is there a spike when transport is rolling.

jrigg avatar Jul 03 '19 09:07 jrigg

Do you think this issue can be closed as something beyond zam-plugins codebase?

zamaudio avatar Jul 04 '19 01:07 zamaudio