Re: [Starpu-devel] Using STARPU_COMMUTE with starpu_mpi_task_build()

[Xavier Lacoste <xl64100@gmail.com>]

Le 26 févr. 2014 à 16:30, Samuel Thibault <samuel.thibault@ens-lyon.org> a 
écrit :

> Xavier Lacoste, le Wed 26 Feb 2014 15:43:26 +0100, a écrit :
>> I tried to use STARPU_COMMUTE with MPI but the option gives an error when 
>> building MPI task.
>> Indeed it does not appear in the test "if (arg_type==STARPU_R || 
>> arg_type==STARPU_W || arg_type==STARPU_RW || arg_type==STARPU_SCRATCH || 
>> arg_type==STARPU_REDUX" in starpu_mpi_task_insert.c
>> Is this the only thing missing or is it more complicated ?
> 
> On the top of my head I think it's a matter of testing against
> arg_type & ~STARPU_COMMUTE to get it working at least. Getting it
> optimized is probably another question, could you show us your use case?

I have several task preforming a GEMM updating a data that can be executed in 
parallel.
In shared memory mode I just used 
starpu_data_set_sequential_consistency_flag() and listed all my dependencies, 
but as it was more complicated to get the list of tasks in distributed, I 
tried STARPU_COMMUTE.

So, in my algorithm, I have several GEMM tasks unlocking a GETRF+TRSM 
unlocking an other list of GEMMs etc.

Is that what you wanted to know ?

XL.