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Question:
How could it be possible that VST plugins do not double CPU calculation (calculating identical L and R) on tracks that contains only mono media items ? (like vocal tracks or any mono microphone track like BD, snare, guitar, bass, etc...)
Asked by binbinhfr (86.211.250.x) on November 28 2022, 9:37pm
Reply on November 30 2022, 3:07pm:
There are a few answers to this:
You can detect mono signals and treat them as such
On modern CPUs with SIMD you can often parallelize stuff for free
Even without SIMD, with modern superscalar CPUs you can often parallelize stuff for nearly free
Even without the above things, a lot of times there is shared work. E.g. a compressor would (often) only have one envelope for the combined signal...
Comments:
Posted by binbinhfr (86.211.250.x) on November 30 2022, 5:14pm:
Sorry for my bad english, but I meant : what can we do in Reaper to avoid this double CPU load on effective mono-tracks ?
Posted by
Justin
on November 30 2022, 6:42pm:
Well then, as my explanation above indicates, there usually isn't a double CPU load, but maybe a slight increase.
Posted by
Justin
on November 30 2022, 6:44pm:
but having said that -- you can use the "VST3 Bus Size" setting on the plug-in and request mono if you're so inclined.
Posted by binbinhfr (86.211.250.x) on December 3 2022, 8:45am:
I did not know about this VST3 feature. I finally made some testing using a VST3 EQ, and effectively, running it in mono or stereo on a mono signal does not multiply CPU by x2. So I have another question for a future CPU upgrade : are these new Intel 13th gen CPUs worth it ? Like this one : Intel Core i5-13600KF (3.5 GHz / 5.1 GHz) Processor 14-Core (6 Performance-Cores + 8 Efficient-Cores) 20-Threads Socket. Does Reaper fully benefit of these "efficient cores" ? Or multi-threading ?
Posted by
Justin
on December 8 2022, 3:47pm:
Efficient cores aren't great for low latecy audio in general, no. But I don't really have an opinion on these CPUs
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