Re: [Starpu-devel] Passing a structure to starpu insert task

[Amani Alonazi <amani.alonazi@kaust.edu.sa>]

Hello Samuel,

Sorry I didn't send the line that throw the seg-fault. It is in the unpack function call:
static void cl_x_cpu_func(void *descr[], void *cl_arg){
  mystruct *s;

  starpu_codelet_unpack_args(cl_arg, &x,
                                     s
                                     );
}

If I change the code into:

static void cl_x_cpu_func(void *descr[], void *cl_arg){
  mystruct s;

  starpu_codelet_unpack_args(cl_arg, &x,
                                     &s
                                     );
}

It works ok. Also, mystruct contains an array that I want to keep track of it. I'm testing now StarPU_INOUT instead of StarPU_Value.

Many thanks for your time. I just want to understand how the struct is handled under the hood.

Thanks again,

Amani

On Sun, Oct 14, 2018 at 9:11 PM Samuel Thibault <samuel.thibault@inria.fr> wrote:

Hello,

Amani Alonazi, le dim. 14 oct. 2018 18:28:21 +0300, a ecrit:
> I have a question about passing a struct to StarPU codelet. If I pass it by
> reference to my function, I got Segmentation-fault error.

The backtrace for the segfault you are getting seems completely
unrelated to these values, notably:

> 0x00007ffff7547dd9 in _starpu_job_get_data_size (model=0x300000001, arch=
> 0x7ffff791ee50 <_starpu_config+4784>, impl=0, j=0x970d60) at core/perfmodel/
> perfmodel_history.c:198

model = 0x300000001 looks very bogus, and is taken from codelet->model,
is starpu_mpi_codelet(codelet) in

>  starpu_insert_task(
>       starpu_mpi_codelet(codelet),

supposed to remain allocated during the task execution?

Perhaps you should show the whole code so we can check what is happening
around the few lines you have sent.

Samuel

--

Amani AlOnazi
PhD Student
Extreme Computing Research Center

King Abdullah University of Science and Technology
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Email: amani.alonazi@kaust.edu.sa

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