Diva and Multicore

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cis-didge
KVRist
402 posts since 28 Jan, 2008

Post Mon Jun 23, 2014 3:44 am

Diva uses more CPU whenever multicore button is on, should it not be less?

Funkybot's Evil Twin
KVRAF
6650 posts since 16 Aug, 2006

Re: Diva and Multicore

Post Mon Jun 23, 2014 3:54 am

Are you using Reaper? If so, it's a known issue with how Reaper calculates CPU usage. If you try, you'll actually notice that you can get a lot more voices with multicore on, so the CPU use is actually down, even though it looks higher.

It's fine in other hosts.

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cis-didge
KVRist
402 posts since 28 Jan, 2008

Re: Diva and Multicore

Post Mon Jun 23, 2014 3:57 am

I am using Live 9

maxthedog
KVRer
8 posts since 6 Jun, 2012

Re: Diva and Multicore

Post Mon Jun 23, 2014 5:06 am

I've noticed that Live 9 reports rather high CPU usage relative to what my systems stats tool reports. I'll scan the Ableton forum later today and see if I find anything...

User avatar
Urs
u-he
23816 posts since 8 Aug, 2002 from Berlin

Re: Diva and Multicore

Post Mon Jun 23, 2014 6:01 am

It also depends on the CPU. Most effect is seen when 4 cores or more are present and if the CPU has Sandy Bridge or newer. Worst results have been observed on Core 2 Duo machines, where it is indeed better to switch the Multicore option off.

On top of that, it isn't good to have more than a few instances of Diva (or any plug-in supporting multicore) enabled with this option, as then the overhead increases. It really is menat to help playing an instance or two live, but it isn't meant to replace track freeze and stuff.

Cheers,

- Urs

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cis-didge
KVRist
402 posts since 28 Jan, 2008

Re: Diva and Multicore

Post Mon Jun 23, 2014 12:14 pm

Its not realy a problem.
I was just wondering why I had an increase in cpu from 10% to 13% running when turning on multicore in one instance of Diva. I was expecting the opposite.

My processor is an i5 quadcore.

User avatar
Urs
u-he
23816 posts since 8 Aug, 2002 from Berlin

Re: Diva and Multicore

Post Tue Jun 24, 2014 5:09 am

Well, multicore costs a tad more CPU in total due to the overhead of distributing voices among cores. It however takes load off of a single core when many voices are played.

Note that monophonic modes don't do that yet, even if voice stacking is enabled. I'm currently working on an updated version of our vocie scheduling that then does this too :-)

NatLife
KVRist
411 posts since 12 Jul, 2004

Re: Diva and Multicore

Post Wed Sep 11, 2019 2:35 pm

it's strange but my Sandy Bridge laptop with 2 physical and 4 threatments - for one sound can jumo from 10% to 45%..
and some sounds even can crash my Core i5 7600K desctop
sample & preset libraries: https://www.natlifesounds.com
Hive 2, Serum, Massive X, Sylenth1, Thorn, Spire, Dune 3, The Legend, EUROPA, Repro1/5...

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