Re: [Starpu-devel] GCC plugin and registering address of scalar

[ludovic.courtes@inria.fr (Ludovic Courtès)]

Hi Mehdi,

Mehdi AMINI <mehdi.amini@silkan.com> skribis:

> I'm still playing with the GCC plugin, it seems that there is no
> support for registering a scalar, I would expect to be able to write
> something like :
>
> int a;
> #pragma starpu register &a
>
> my_task(..., &a, ...)
>
> #pragma unregister &a
>
>
> Do you plan to support such syntax in the future?

I don’t think so.  Registering is meant to be used for large data
buffers, whose transfer between GPUs and the main memory influences the
scheduler.

However, I suppose you’d like the task to return an int to indicate
success or failure, right?

I confess that the assumption has been that tasks are purely
computational, and that their result is typically stored in a large
array passed as an output parameter.

Could you tell us more about your use case?

> Is there another workaround that declaring a as int a[1];?

No, that would be the workaround.  :-)

Thanks,
Ludo’.

PS: I haven’t forgotten about your other requests, but am slightly busy
    with other things currently.