Re: [Viennacl-support] CL_OUT_OF_RESOURCES in matrix multiplication

[Malte H. <mal...@go...>]

Thanks,

it seems that, this is indeed the problem. I did not spend any thoughts
on memory limitations on the graphics card. 

I don't think I will need tiling, as there are a lot of optimizations
that can be done to reduce the calculation to a sparse-matrix vector
product which should be far from exceeding the memory, even on my
development system. 


Best,
Malte

On Sun, 2011-02-06 at 11:06 +0100, Karl Rupp wrote:
> Hi Malte!
> 
> The CL_OUT_OF_RESOURCES is most likely due to the exhausted GPU-RAM. 
> Considering that you compute the matrix-matrix-product of two 3000 x 
> 3000 matrices and write the result to another 3000 x 3000 matrix, a 
> total of 3 x 3000 x 3000 = 24 Mio entries have to be stored. With 4 
> bytes per entry in single precision, this results in about 96 MB of 
> memory. I suppose that your GeForce GM 320 provides only 128 or 256 MB 
> of memory, so there is simply no more memory left for larger matrices.
> 
> One remedy for larger matrix-matrix products is to decompose the system 
> matrix into smaller tiles (e.g. decompose 3000 x 3000 matrices into four 
> 1500 x 1500 matrices) and to have only two tiles at the same time on the 
> GPU.
> 
> Hence, there are two options at present: Either use a graphics board 
> with more memory, or implement the tiling outlined above by hand.
> 
> Best regards,
> Karli
> 
> 
> 
> On 02/06/2011 02:40 AM, Malte Harder wrote:
> > Hi there,
> >
> > I have a problem using ViennaCL in one of my projects. I did some small
> > OpenCL tests before, but I never really used it because there was no
> > quick&  easy way to plug it into Eigen which I usually use for linear
> > algebra computations. ViennaCL seems to solve this problem very
> > conveniently!
> >
> > However, I keep getting CL_OUT_OF_RESOURCES errors in a simple matrix
> > multiplication. Is this the normal behaviour when the matrix is larger
> > (in my case 3000x3000) than the work item sizes?
> >
> > I'm on a 64bit Arch Linux with Nvidia drivers 260.19.21, a GeForce GM
> > 320 and I'm using the kernel parameters generated by the kernelparam
> > programs supplied with the latest version of the library.
> >
> > Best regards,
> > Malte
> >
> >
> >
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> >
> >
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