Re: [Starpu-devel] Temporary buffer initialization

[Nathalie Furmento <nathalie.furmento@labri.fr>]

All,

As a side remark, STARPU_PROLOGUE_CALLBACK is now (from revision 12706 in the trunk) properly recognised in the starpu_mpi_insert_task() function.

Cheers,

Nathalie

On 16/04/2014 14:59, Xavier Lacoste wrote:

Hello,

I want to have a temporary buffer, allocated by starpu, and initialized (to zero).

Some task will add values in it afterward and then it will be send to an other process for a remote task.

These local tasks can be executed in any order.

In order to initialize the buffer (memset(data, 0, size)) should I use prologue callback function to check if the buffer is already allocated and if not tell starpu to allocate it and call my memset ? Or is the data already allocated in prologue ? Can I have a way to know if it's the first time it's used ?

If the prologue solution is the one to use, it would be nice if it was available in the starpu_mpi_insert_task() function.

I could insert a task to initialize it but it would allocate the buffer too early, when it is not used...

Regards,

XL.

----------------------------------------

Xavier Lacoste

xavier.lacoste@inria.fr

INRIA Bordeaux Sud-Ouest

200, avenue de la Vieille Tour

33405 Talence Cedex

Tél : +33 (0)5 24 57 40 69

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