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

Mark Elendt mark at sidefx.com
Fri Oct 5 16:46:34 EDT 2007


On Friday Oct 05 at 16:12, Larry Giunta wrote:
> So, we've seemed to narrow down our slow mantra render problem
> in H9 to multiprocessor rendering.

You are using the new -j option?  Not the -n?

By default mantra will be using all your processors.  If you happen to
be using the old -n multi-host way of adding machines, you'll in fact
be running 16 threads on a 4 processor system (using -n4).

Just a sanity check...

> 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
> -----------------------------------------------




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