[argobots-discuss] Writing recursive task parallel program with argobots

[Shintaro Iwasaki]

Hi Raghav,

Thank you for using Argobots!

Yes, in this case, please use ABT_thread. I understand that the naming is
extremely confusing, but ABT_thread (=user-level threads) works as a task
in typical HPC fine-grained task-parallel programs. Other libraries used
for task parallel programs also use "threads" for task implementations
(Qthreads, MassiveThreads, ...). You can consider ABT_task (=tasklet) as a
special user-level thread that cannot yield. The Argobots paper (Argobots:
A Lightweight Low-Level Threading and Tasking Framework) describes
the details.

If you have any further questions, please feel free to ask here!

Thanks,
Shintaro



On Thu, Oct 7, 2021 at 11:28 AM Raghav Gupta via discuss <
discuss at lists.argobots.org> wrote:

> Pasting the code snippet link again without any formatting -
> https://gist.github.com/raghav0307/9252fc7b568bc35baab29bdc9da70618
>
> On Thu, Oct 7, 2021 at 11:55 PM Raghav Gupta <raghav18076 at iiitd.ac.in>
> wrote:
>
>> Hi,
>>
>> I am trying to use argobots for writing a recursive task parallel
>> program.
>>
>> I have taken a very simple recursive task program example, where I am
>> creating a parent argobot task which creates two child argobots tasks and
>> then waits for them by calling ABT_task_free(). When I run this program
>> with one xstream I find that it doesn't terminate. *(Code snippet - *
>> https://gist.github.com/raghav0307/9252fc7b568bc35baab29bdc9da70618* )*
>>
>> My understanding is that this is because the parent task never yields the
>> xstream to the child tasks, and hence the program gets stuck.
>>
>> This program terminates when I use argobot threads instead of
>> argobot tasks. Could someone point me to why this is not working with
>> argobot tasks?
>>
>> Best,
>> Raghav
>>
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