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Distribution of processor power in Logic 8
Last post Sat, Sep 06 2008 by Cyril Blanc, 4 replies.
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Posted on Fri, Sep 05 2008 11:24
by temasterson_1870
Joined on Tue, Mar 25 2003, Posts 19
Hi all. I think this is a topic which is specific to Vienna Instruments. I have tried loading multiple (16+) instances of other virtual instruments and I do not have the problems that I have with Vienna.

Ok, I'll try and keep this simple. If I create a Logic arrangement with around 16 or more stereo instances of Vienna Instruments, with my buffer set to 64, Logic will distribute the load evenly across the 8 cores of my MacPro during playback. But this is only the case if I do not have one of my Vienna Instruments tracks selected to play / perform / record. During playback, if I click on any of the channels which have a Vienna Instrument on to compose or record a new section, one of the 8 cores (which is always no.8 BTW) will shoot up into the red causing glitches, distortion, and error messages. The other 7 cores are at about 5 - 10%

This happens even if there is no reverb plugins open at all. My conclusion - when composing, 16 stereo Vienna Instruments is the limit for my 8-core set; when mixing and for general playback, I have not yet reached the a limit.

Raising the buffer to 256 helps, but the latency is unbearable. By the time I get to 20+ stereo Vienna Instruments I actually have to draw the events in the piano roll window, because performing new parts is simply impossible.

So, my questions are: Does this happen on all new Macpro systems? If not, how can I make Logic evenly distribute the processor power as well as it does during playback, when I compose / perform during playback?

Thanks
Posted on Fri, Sep 05 2008 11:44
by Conquer
Joined on Thu, Sep 28 2006, Posts 812

Hi, sorry I can't answer your specific questions but as an aside, using Vienna Ensemble (a great way of combining multiple VI's, and it's free) might help.

temasterson_1870 wrote:
Raising the buffer to 256 helps, but the latency is unbearable.
In theory that should give a latency of 5 milliseconds at 44.1kHz - that's pretty small, are you experiencing a longer delay?

Posted on Fri, Sep 05 2008 15:49
by temasterson_1870
Joined on Tue, Mar 25 2003, Posts 19
Thanks for the advice. I just experimented with using VE instead of VI and I agree that overall it does lower the processing power.


But the Buffer setting in the Server Interface window is very strange. If my Logic buffer is set to 32 for example and the Server Interface buffer is set to x2 there is practically no cpu usage at all when playing back 12 or 16 stereo matrixes and I can perform over the top without using any more cpu. But if I select x1 Buffer - my god! I immediately max out core 8 just like before.



Its amazing that changing the buffer by such a tiny amount could cause such instability. I need to do more tests.

Also - I can't work out how to open the VE application in stand alone mode. Nothing happens if I double click on it
Posted on Sat, Sep 06 2008 02:01
by Cyril Blanc
Joined on Thu, Dec 19 2002, Paris France, Posts 2766
Hello

A few questions :

What 8 core ? How much memory do you have ?
What disks ?
How is organize your Mac, where is VSL ?
Did you try using the VE ?


Can you open the apps "Activity monitor" select "system memory" is there is any "swap used" after the 8th core has gone in the red ?



Best
Cyril


P.S. Using Safari you must add > with BR inside to add CR
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