CUDA 5.0

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toxie
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CUDA 5.0

Postby toxie » Tue Oct 16, 2012 9:47 am

Better you leave here with your head still full of kitty cats and puppy dogs.

spectral
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Re: CUDA 5.0

Postby spectral » Tue Oct 16, 2012 6:42 pm

Thanks Toxie,

But it sounds that there is no more OpenCL support in this SDK. I have try the Visual Profiler and it does not detect OpenCL.
I have contact NVidia and they tell that it is normal that OpenCL is not supported !
Spectral
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toxie
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Re: CUDA 5.0

Postby toxie » Wed Oct 17, 2012 12:29 pm

Indeed OpenCL is not really the major focus anymore, but rather CUDA and OpenGL (4.3) compute shaders..
Better you leave here with your head still full of kitty cats and puppy dogs.

spectral
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Re: CUDA 5.0

Postby spectral » Wed Oct 17, 2012 6:35 pm

toxie wrote:Indeed OpenCL is not really the major focus anymore, but rather CUDA and OpenGL (4.3) compute shaders..


It seems.. I understand for CUDA but I don't understand why OpenGL contains compute shader now... is there some advantages over CUDA or OpenCL !
Or it is just yet another 'level' over open gl ?
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graphicsMan
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Re: CUDA 5.0

Postby graphicsMan » Wed Oct 17, 2012 6:56 pm

From what I could tell, it allows low-overhead scheduling of the shader in the same GL context. That means that it may be possible to avoid driver context switches if you want to do lightweight compute during graphics intensive work.

Dade
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Re: CUDA 5.0

Postby Dade » Thu Oct 18, 2012 9:01 am

toxie wrote:Indeed OpenCL is not really the major focus anymore, but rather CUDA and OpenGL (4.3) compute shaders..


Sorry, does this mean NVIDIA is not going to support OpenCL any more ?

spectral
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Re: CUDA 5.0

Postby spectral » Thu Oct 18, 2012 9:16 am

Dade wrote:
toxie wrote:Indeed OpenCL is not really the major focus anymore, but rather CUDA and OpenGL (4.3) compute shaders..


Sorry, does this mean NVIDIA is not going to support OpenCL any more ?



I'm not sure... and honestly it is not a good strategy to sell their hardware. Developers are still able to use some API to use either CUDA or OpenCL for their application (Just an API and a few #define in the kernels), it is not really difficult. What they will do is simply force peoples to use softwares that does not support NVidia hardware ! And with low OpenCL support we will have poor OpenCL software on NVidia !

BTW, here is the answer I have got from NVidia about the non support of OpenCL in 5.0 toolkit :

Thanks for contacting Nvidia!

This is by design. The visual profiler (and the new nvprof profiler) do not support OpenCL in the 5.0 toolkit. You can use the visual profiler from the 4.2 toolkit to get OpenCL support. Sorry for any inconvenience!


I'm still thinking that it will be better for NVidia to provide a very good support for OpenCL, this way users will prefer using NVidia GPUs if they performs better (It is my case now). But we need a debugger and a profiler.

Just my advice.
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toxie
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Re: CUDA 5.0

Postby toxie » Thu Oct 18, 2012 3:07 pm

Dade wrote:
toxie wrote:Indeed OpenCL is not really the major focus anymore, but rather CUDA and OpenGL (4.3) compute shaders..


Sorry, does this mean NVIDIA is not going to support OpenCL any more ?


I don't think so, it's still supported, but i would say that the focus is on supporting mainly CUDA and GL compute..
Better you leave here with your head still full of kitty cats and puppy dogs.

spectral
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Re: CUDA 5.0

Postby spectral » Fri Oct 19, 2012 8:10 am

Here is another reply form NVidia that confirm what Toxie wrote :

Now we are focusing our efforts on CUDA at this point, this bug is not fixed in this release and will be evaluated for the next.

Today CUDA 5.0 is very efficient and is very convenient to use. A customer will get immediate support when using CUDA. If CUDA is an option for you, it will be a good choice.
Spectral
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Dade
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Re: CUDA 5.0

Postby Dade » Fri Oct 19, 2012 9:22 am

BTW, AMD has recently released CODE XL : a good CPU and OpenCL profiler/debugger. I have done some test and it is a quite useful tool (when it doesn't crash ... it happens often on my Linux box).


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