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


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  • From: Maxim Abalenkov <maxim.abalenkov@gmail.com>
  • To: Samuel Thibault <samuel.thibault@inria.fr>
  • Cc: starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] [LU factorisation: gdb debug output]
  • Date: Wed, 24 Jan 2018 17:52:48 +0000
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Hello Samuel,

Thank you very much! Yes, in this particular use-case “STARPU_NONE” would come handy and make the source code much more “elegant”.

—
Best wishes,
Maxim

Maxim Abalenkov \\ maxim.abalenkov@gmail.com
+44 7 486 486 505 \\ http://mabalenk.gitlab.io

On 24 Jan 2018, at 17:47, Samuel Thibault <samuel.thibault@inria.fr> wrote:

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


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