Re: [Starpu-devel] Matrix Filters

[Cédric Augonnet <cedric.augonnet@inria.fr>]

Hi Nathalie,

In the CPU kernel, you are computing the index as j*nx + i, should not that be j*ld + i (by definition of ld), and in the case of non contiguous matrices, ld != nx. Perhaps that explains your issues ?

Cédric

On 12/07/2010 11:25, Nathalie Furmento wrote:

4C3B33D7.7020403@labri.fr">I have a question about the filters. I have  a sample application which defines a matrix, partitions it in 2 blocks, and sets the elements of the i-st block to i.

Here the output i get with the filter *starpu_block_filter_func*:

IN  Matrix:
10 11 12 13
14 15 16 17
18 19 20 21
22 23 24 25

OUT Matrix:
 0  0  1  1
 1  1  1  1
 1  1 20 21
22 23 24 25

And with the filter *starpu_vertical_block_filter_func*

 IN  Matrix:
10 11 12 13
14 15 16 17
18 19 20 21
22 23 24 25

OUT Matrix:
 0  0  0  0
 0  0  0  0
 1  1  1  1
 1  1  1  1

So it is working fine with *starpu_vertical_block_filter_func*, but not with *starpu_block_filter_func*.

Any ideas on what's wrong ....

Thanks,

Nathalie

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Cédric AUGONNET
PhD student -- Runtime Team
http://runtime.bordeaux.inria.fr/augonnet/
INRIA Bordeaux - LaBRI