[Sidefx-houdini-list] stability of mantra on multi core machines?

Michael K O'Brien mobrien at pixar.com
Tue Jul 29 12:17:06 EDT 2008


Hola~

Yes. If the render cores out, it's pretty easy to detect that and retry the
frame. However, it constantly just deadlocks. I can't imagine trying to use
mantra on a production.

MO

--
Michael K O'Brien
mobrien at pixar.com
Pixar

JEN: Just because it's Taco Bell doesn't mean it's not dinner!

> -----Original Message-----
> From: sidefx-houdini-list-bounces at sidefx.com [mailto:sidefx-houdini-list-
> bounces at sidefx.com] On Behalf Of Simon Kapeniak
> Sent: Tuesday, July 29, 2008 12:49 AM
> To: sidefx-houdini-list at sidefx.com
> Subject: Re: [Sidefx-houdini-list] stability of mantra on multi core
> machines?
> 
> The question is why 8 cores rendering eats much more memory then 1 core.
> Don't cores share memory? I understand 20% differences, but Mantra likes
> to
> take as big as  twice ram in mulithreding mode. It also doesn't explain
> the
> situation in which mantra doesn't fail but freezes on a few buckets in
> multi-core rendering.
> 
> 2008/7/29 Pablo Giménez <pablogipi at gmail.com>
> 
> > Yes unfortunately, when you reach the memory limit of your machines you
> get
> > random fails, and mantr exists only with a segfault, very bad.
> > I has a similar problems some months ago and I rememberd struggling
> myself
> > trying to find the problem and it was the memory, nothing else, but
> because
> > Mantra exists without any info you can waste a lot of time trying to
> figure
> > out what is happening.
> > And also, rendering with 4 cores seems pretty solid, with eith cores I
> have
> > experimented problems in early versions if mantra 9 and 9.1.
> > Cheers
> >
> > 2008/7/28 paul simpson <paul at realisestudio.com>
> >
> > > for linux: man ulimit
> > >
> > > 2008/7/28 Guillaume Laforge <guillaume at alamaison.fr>
> > >
> > > > We've got the memory limit problem here when rendering fur
> procedurals
> > !
> > > > If the memory is closed to the limit, frames randomly crash.
> > > > As a workaround we set a time bomb on our rendermanager to re-render
> > > > those bad frames. The same frames can crash twice or more and then
> > > > render fine.
> > > > I don't know if there is a way to set a memory limit in Mantra as in
> > > > Mental Ray ?
> > > >
> > > > Cheers
> > > >
> > > > Guillaume Laforge | la maison <http://www.alamaison.fr>
> > > > my new little blog : http://frenchdog.wordpress.com/
> > > > <http://frenchdog.wordpress.com/>
> > > >
> > > >
> > > > Guillaume Laforge a écrit :
> > > > > _______________________________________________
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> > >
> >
> >
> >
> > --
> > Un saludo
> > Best Regards
> > Pablo Giménez
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> >
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