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

Peter Bowmar pbowmar at gmail.com
Fri Oct 5 16:22:28 EDT 2007


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
>
>
>
>
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