Re: [Starpu-devel] StarPU code hangs when using a lot of GPU memory

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

Mirko Myllykoski, le ven. 01 mars 2019 18:11:57 +0100, a ecrit:
> The output of the macro was not very informative:
[...]
> Node 1:
>   Total used: 5815, 4493MiB
>   WT: 0, 0MiB
>   home: 0, 0MiB
>   redux: 0, 0MiB
>   relax: 0, 0MiB
>   noref: 0, 0MiB
>   nosubdataref: 0, 0MiB
>   nodataref: 0, 0MiB
> 
>   cached: 0, 0MiB

It actually is: nosubdataref and nodataref mean that all of the 5815 are
considered busy, and that's the reason why they can't be evicted.

Could it be that you have a *lot* of tasks which are ready? It might
just be that they all almost have their data on the GPU, but none of
them has all it needs, and thus none of them can be executed. It is a
fairly extreme situation that we did envision, but didn't put management
in StarPU yet. That's however precisely the kind of work I'll be having
a look at in the coming months :)

Samuel