Re: [Starpu-devel] Constructing codelet-chain loop

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Albert Sidelnik, le Thu 19 Apr 2012 10:05:13 -0500, a écrit :
> 1) By setting regenerate = 1 for all tasks,  my assumption is that
> when tasks are regenerated, they preserve their tag dependences.

They do

> 2) If each task has only one predecessor that it is dependent on, I
> can resolve that dependence directly through a starpu_tag_notify()
> call in order for that task to execute

In case of a tag associated to a task, I'm not sure of the semantic.
Better use a tag not associated to a task, as in the
tests/main/subgraph_repeat_regenerate_tag.c test I have just added.

> 3) The task graph is constructed a priori (I never need to resubmit the 
> task)

Yes.

> For the previous test case, if I were not to utilize tags (and
> starpu_tag_notify), and only rely on resubmitting tasks similar to the
> test case in main/subgraph_repeat_regenerate.c, things work It's only
> when dealing with the tags, that things fail.

Yes, it's the restart part that is missing.

Samuel