[Bf-committers] OpenMP on osx

Tobias Kummer supertoilet at gmx.net
Tue Aug 16 13:18:03 CEST 2011

Yes, it's an i7 running here. Would be great to auto-detect this. In the 
meanwhile, I'll compile without OpenMP.


On 8/16/11 1:04 PM, Campbell Barton wrote:
> On Tue, Aug 16, 2011 at 8:54 PM, Tobias Kummer<supertoilet at gmx.net>  wrote:
>> Hey there!
>> I just realized that when using an OpenMP enabled build on osx (cmake),
>> all simulations and baking run terribly slow. When I compile the same
>> revision with OpenMP disabled, it uses one core at 100% and is MUCH
>> faster. Can anyone confirm this? Are there known problems with OpenMP on
>> OSX?
>> Greets,
>> Tobi
> At the blender institute we had the same problems and it seemed to be
> because of the processor (core2's were ok but i7's had performance
> problems), rather then rebuilding you can set the OMP_NUM_THREADS
> environment variable to 1.
> We could make blender detect this on startup and set OMP threads to 1
> based on the processor - using a shell script or perhaps it can be
> done in blender's main function on startup.

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