[starpu-devel] StarPU Question: Using Local Variable as Data Handles?

[Xinbo Li <lix34545@myumanitoba.ca>]

Dear StarPU Developers,

I am currently exploring the use of StarPU to accelerate a boundary element method solver, and I have a question regarding best practices for data handle management.

Is it safe to define a starpu_data_handle_t as a local variable for the purpose of task submission? For example, in the code snippet below, the handle is declared within a local scope. Once the block ends, the variable handle is no longer accessible. My concern is whether StarPU may run into undefined behavior or errors when the scheduled task is executed, since it may no longer be able to access the handle:

DataType data;

{

    preparation(&data);

    starpu_data_handle_t handle;

    starpu_custom_data_register(&handle, STARPU_MAIN_RAM, &data);

    starpu_task_insert(

        &some_codelet,

        STARPU_RW, handle,

        0);

}

Could you please clarify whether this usage is safe or if the data handle needs to remain in scope beyond task insertion?

Thank you very much in advance for your guidance.

Best regards,
Xinbo
PhD Student
University of Manitoba