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

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

Dear StarPU dev,

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.
MORSE_Task_x(..., mystruct* s){ ...
 starpu_insert_task(
      starpu_mpi_codelet(codelet),
      ...
      STARPU_VALUE, s, sizeof(mystruct),
      ...
      0);

}

Thread 8 "CPU 0" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdaffd700 (LWP 27333)]
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
198        if (model && model->state->per_arch && comb != -1 && model->state->per_arch[comb] && model->state->per_arch[comb][impl].size_base)
(gdb) bt
#0  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
#1  0x00007ffff758f5ef in _starpu_driver_end_job (worker=0x7ffff791ee08 <_starpu_config+4712>, j=0x970d60, perf_arch=0x7ffff791ee50 <_starpu_config+4784>, rank=0, profiling=0) at drivers/driver_common/driver_common.c:131
#2  0x00007ffff76337fd in execute_job_on_cpu (j=0x970d60, worker_task=0x970910, cpu_args=0x7ffff791ee08 <_starpu_config+4712>, rank=0, perf_arch=0x7ffff791ee50 <_starpu_config+4784>) at drivers/cpu/driver_cpu.c:122
#3  0x00007ffff76345de in _starpu_cpu_driver_run_once (cpu_worker=0x7ffff791ee08 <_starpu_config+4712>) at drivers/cpu/driver_cpu.c:307
#4  0x00007ffff763495a in _starpu_cpu_worker (arg=0x7ffff791ee08 <_starpu_config+4712>) at drivers/cpu/driver_cpu.c:368
#5  0x00007fffedd826ba in start_thread (arg=0x7fffdaffd700) at pthread_create.c:333
#6  0x00007fffec86441d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

However, if I pass it by value, the problem is solved. Am I missing something?

Thanks,

Amani

On Wed, May 2, 2018 at 9:41 PM Hatem Ltaief <hatem.ltaief@kaust.edu.sa> wrote:

solved, thx!
H
> On May 1, 2018, at 12:56 PM, Samuel Thibault <samuel.thibault@inria.fr> wrote:
>
> Hatem Ltaief, le mar. 01 mai 2018 09:54:44 +0000, a ecrit:
>> I am trying to pass a single data structure (composed of int, float, etc...) to a starpu insert task API using STARPU_VALUE. Is that the right way to do it for data structures?
>
> You can pass both the pointer to the structure and the size of the
> structure, yes.
>
> 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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