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

Andrew Clinton andrew at sidefx.com
Mon Oct 15 12:07:52 EDT 2007


Just a note that the performance of volume rendering (when using deep 
shadow maps) may be significantly improved on multiprocessor systems in 
9.0.748.  I'd be interested to know how it works on 8-core systems as I 
don't have such a system available to test with.

Andrew

Pablo Giménez wrote:
> 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
>>>
>>>
>>>
>>>
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>>>
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