Re: [Starpu-devel] [LU factorisation: gdb debug output]

[Samuel Thibault <samuel.thibault@inria.fr>]

Hello,

Maxim Abalenkov, on lun. 15 janv. 2018 18:04:48 +0000, wrote:
> I have a very simple question. What is the overhead of using the STARPU_NONE
> access mode for some handles in the STARPU_DATA_MODE_ARRAY?

It is not implemented, we hadn't thought it could be useful. I have now
added it to the TODO list (but that list is very long and doesn't tend
to progress quickly).

The overhead would be quite small: StarPU would just write it down in
the array of data to fetch, and just not process that element. Of course
the theoretical complexity will be O(number of data).

> In order to avoid using complicated offsets in my computation routines
> I would like to pass them a column of matrix tiles, while setting the
> “unused” tiles to “STARPU_NONE”.

I see.

Samuel