Hey Karl, that assignment would be great. For now I will add a custom
kernel to transcribe. The permutation matrix test I did does not cost
any more than copying to the CPU and running the same thing, but
you're right: it is wasting effort to load values and performing fmad,
and I should be able to bypass it.
-E
On Fri, Jul 26, 2013 at 9:11 AM, Karl Rupp wrote:
> Hi Evan,
>
>> I need to scatter the elements of a vector out to multiple processors.
>> The mapping is one to many (vector elements can go to many procs). I
>> would like to do this with a permutation matrix which has 1 nonzero
>> per row.
>>
>> I'd like the process to run on the GPU, so a warp would need to
>> operate on multiple rows of the permutation matrix. What do you think
>> the best approach would be?
>
> The best approach with the existing API would be to fill such an
> 'permutation matrix'. However, this is a little wasteful in terms of
> memory bandwidth.
>
> There's also another option available soon: A couple of days back I
> added some first support for viennacl::vector and friends, and for
> the next release we already want to provide an assignment of the form
> vector x,y;
> vector indices;
> ...
> x = y(indices); // or similar. API not decided yet.
>
> Over time this will gradually be extended to support more complicated
> expressions, but this is quite some undertaking in terms of robust
> implementation and thus won't happen 'immediately'.
>
> Best regards,
> Karli
>
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