[LAU] Balance between performance and noise

Robin Gareus robin at gareus.org
Sat Jan 29 14:32:25 UTC 2011


On 01/29/2011 03:29 PM, Jeremy Jongepier wrote:
> On 01/29/2011 03:03 PM, rosea.grammostola wrote:
>> The mp support of Jack2 seems to be an advantage when it comes to cpu
>> load.
> 
> I just learned via #jack that smp support only applies when you use JACK
> with parallel clients. Bit cryptic but better described here:
> http://www.grame.fr/~letz/jackdmp.html
> 
> "Jackdmp current implementation allows explicit parallel clients in a
> graph to be processed on several available CPU at the same time. A
> typical case is:
> 
>     * in == > A ==> C ==> out and in == > B ==> C ==> out
> 
> A and B depend of the same input (the "in" driver in this case) and can
> be activated on 2 processors, C waits for A and B outputs. "
> 
> So afaik if you use Jack2 with a single client like Yoshimi it doesn't
> take advantage of its smp support, hence it shouldn't make a difference
> whether you use Jack1, Jack2 or tschack.
> 
> Hopefully I didn't get this wrong ;)

nope, I was just going to point out the same.

what's different is the zombification behaviour. try using jack1 with "-Z"

> Btw, I'm working on a tschack package for Ubuntu 10.04, almost done :)
> 
> Best,
> 
> Jeremy
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