[Mesa-users] threading in mesa

[burlen]

> GLSL 1.30 should work with OSMesa, but yeah, no threading there. 
Nice! So which compiler is used for runtime glsl compilation? llvm does 
not seem to be required to build osmesa, does this mean which ever 
compiler was used to build osmesa will be used for glsl?


On 12/10/2012 08:53 AM, Brian Paul wrote:
> On 12/07/2012 08:19 PM, burlen wrote:
>> Hi Brian,
>>
>>> Be aware that the llvmpipe driver does not work with the OSMesa
>>> interface.
>> :-(
>>
>> that's no fun. In general, I would really like to be using llvmpipe
>> driver. If I'm reading mesa docs correctly it's the only one that
>> supports threading and provides glsl.
>
> GLSL 1.30 should work with OSMesa, but yeah, no threading there.
>
>
>> I'm using osmesa without x on
>> systems like cray xe, 24 cores per node, and sgi uv 1000 1024 cores.
>> Soon we'll also be using an intel mic cluster, each card will have 60
>> cores with 2 hardware threads, and 2 hyper threads. I would expect
>> that the threaded driver would make a big difference on these systems.
>>
>> Is there any info on the performance or scaling of the threaded
>> llvmpipe driver?
>
> I don't know if anyone's tried LLVMpipe with more than 8 cores (that's 
> all I have).  And I haven't done any comparisions of perf as a 
> function of number of cores lately.  The perf probably flattens out at 
> some point.  That would be a good project for someone.
>
> There seem to be quite a few people interested in OSMesa+LLVMpipe but 
> I just haven't had the time to implement it.
>
> -Brian
>