Thread: Real Time CPU
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Old 04-26-2012, 11:42 AM   #10
Spectralis
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Join Date: Aug 2010
Posts: 67
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Quote:
Originally Posted by n0rd View Post
ASIO is the preferred protocol. Since you are using ASIO4ALL I can only assume that you are using an on-board sound card and not an "audio interface". They are kind of the same but on-board sound cards are made basically just to play back pre-recorded audio and not very good and generating audio on the fly ie real time / daw use.

Can you specify what device you are using?


@ Both faun2500 & Spectralis:
Do you have the >100% RT CPU issue with all or only particular synths?
Output device is the USB speaker codec. It doesn't happen as much with other plugins but even then Reaper is not anywhere near utilising all 6 cores and the sound breaks up.

In the SynthMaster example I gave, Reaper is playing just one synth using a lead sound and a monophonic midi file. That's hardly taxing for a USB speaker driver I think.

The problem seems to be that Reaper is unable to utilise all six cores effectively and just maxes out a single core. This seems to be the case because when I set SynthMaster to 'Best' mode the sound breaks up and RTCPU reports 133% CPU utilisation. IOW Reaper is chewing up all of one core because it can't or won't utilise the other 5. Perhaps this is why it glitches.

To put this in context, I regularly edit in Sony Vegas Pro 11 using quite a lot of CPU hungry FX plugins and even when Vegas is utilising nearly all six cores it plays back without glitching. I have to really push it for the sound to break up.
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