[Sidefx-houdini-list] mantra in H9 - multiprocessor

Pablo Giménez pablogipi at gmail.com
Fri Oct 12 09:40:32 EDT 2007


We have found similar problems rendering volumes and using multithreading.
In our case using machines with four cores runs perfectly but when you
render the same frame into an eight cores machine the render is three times
slower.
We are using -j0 switch to launch the render in the farm.

2007/10/5, Peter Bowmar <pbowmar at gmail.com>:
>
> Hi Larry,
>
> Are you rendering volumes? They don't multithread very well we've
> discovered. Multithreading seems most effective when doing things like
> PBR rendering.
>
> Cheers,
>
> Peter B
>
> On 05/10/2007, Larry Giunta <larry at gcreativestudios.com> wrote:
> > So, we've seemed to narrow down our slow mantra render problem
> > in H9 to multiprocessor rendering.
> >
> > If we render on only one proc, render times seems as fast as expected.
> > However, with each increase to the thread count our render times get
> > increasingly slow.
> > The system monitor does show the appropriate number of processors
> > working.
> >
> > On the same machine multiprocessor rendering works just fine in H8, but
> > in H9 we get the following time increase with each thread added.
> >
> > We're running 9.0.739 on FC4
> >
> > Wondering if anyone else is getting similar results  ......... or if
> > this is just unique for us.
> >
> > Larry
> >
> > -----------------------------------------------
> > 1 thread
> > 9.01u 0.38s 9.02r
> >
> > 2 thread
> > 15.15u 0.42s 7.77r
> >
> > 3 thread
> > 56.13u 0.56s 19.02r
> >
> > 4 thread
> > 2:13.80u 0.64s 33.96r
> > -----------------------------------------------
> >
> >
> > --
> > Larry Giunta
> > Creative Director
> > G Creative Studios
> > (781)393-0200
> > larry at gcreativestudios.com
> > www.gcreativestudios.com
> >
> >
> >
> >
> > _______________________________________________
> > Sidefx-houdini-list mailing list
> > Sidefx-houdini-list at sidefx.com
> > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>



-- 

Un saludo
Best Regards
Pablo Giménez



More information about the Sidefx-houdini-list mailing list