Re: [Gimp-developer] Gimp 2.8 blend time

On Fri, 2012-05-11 at 23:01 +0200, gfxuser wrote:
> Hi,
> On 2012-05-11.12 Michael Natterer wrote:
> > I don't currently have 2.8 installed on this Mac, but it can hardly
> > be slower, unless the threading got broken in GLib, try to set
> > #processors to 1 in prefs and try again.
> thanks Mitch, for your reply.
> You're right, on the Mac it depends on the number of processors. Varying 
> this number in the preferences dialog between 1 and 16 showed 
> significant differences. The operation takes 1 second if  #processors is 
> set to 1 and about 8 seconds if it's set to 16 processors.
> BTW: my Mac has 1 processor with 2 cores. It's quite pointless to be 
> able to set #processors in prefs to 16. The upper bound for the input 
> value should be the actual number of processors or cores. Is this a 
> known issue or shall I file a new bug in Bugzilla?

Please file it in bugzilla, it's pointless to use threading if it makes
things slower, and we have no code to determine the #cpus on the mac
anyway, so we should default to one.

> > Also, what build are you using? Native or X11?
> How can I find this out? I used the fresh 2.8 version from 
> When running GIMP, the X window is open, too. So I'm 
> sure it's the X11 build. How could I otherwise find out whether the Mac 
> build is native?

As Partha said :)


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