[Ardour-Users] Ardour uses 100% cpu when paused, 10% when idle

Sampo Savolainen v2 at iki.fi
Sat May 7 11:21:19 PDT 2011


This sounds like a denormal problem. Try disabling all plugins and then try
duplicating the issue. If the problem is gone, enable each plugin one by one
to figure out where the issue is. Denormals can be caused by bad plugins
and/or bad parameters for plugins.

Ardour has different denormal protection schemes (Options -> Performance ->
Denormal handling -> ...). But be sure to first check that the plugin
parameters are sane (for examples EQ parameters extremely close to zero but
!= 0).

More on denormals: http://ardour.org/node/139


On Sat, May 7, 2011 at 1:00 PM, Mark Veltzer <mark.veltzer at gmail.com> wrote:

> Hello all!
> First of all - thank you for a wonderful piece of software...
> I've searched the archives for these types of bugs before reporting but
> only found reports dating 5 years ago so here goes...
> I'm recording with ardour, and then playing back (with some plugins,
> fairly standard). When I pause the playback ardour consumes 100% CPU.
> When I move the head back to the begining of the tune CPU consumption
> goes does to about 10%.
> So two questions:
> - why 100% when I'm doing nothing ?
> - why 10% when I'm doing nothing ?
> Some info:
> Ubuntu 11.04.
> kernel 2.6.38-8.
> I have the old firewire stack installed on it (since ffado needs
> the old stack).
> jack version 1.9.7.
> Ardour version 2.8.11.
> Again, thank you (Paul and all) for a wonderful piece of software. My
> windows friends are envious...:)
> BTW: I am a software developer knowledgable in Linux kernel as well as
> user space. If you have some menial task please assign it to me. I don't
> have a lot of time but what I have I will gladly contribute...
> --
> Mark Veltzer <mark.veltzer at gmail.com>
> www.veltzer.net
> _______________________________________________
> Ardour-Users mailing list
> ardour-users at lists.ardour.org
> http://lists.ardour.org/listinfo.cgi/ardour-users-ardour.org
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