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Subject: Re: [OMPI users] Open MPI, cannot get the results from workers
From: David Zhang (solarbikedz_at_[hidden])
Date: 2010-07-06 01:41:44


if the master receives multiple results from the same worker, how does the
master know which result (and the associated tag) arrive first? what MPI
commands are you using exactly?

On Mon, Jul 5, 2010 at 4:25 PM, Jack Bryan <dtustudy68_at_[hidden]> wrote:

> When the master sends out the task, it assign a distinct task number ID
> to
> the task.
>
> When the worker receive the task, it still use the task's assigned ID as
> task tag to send it to master.
>
> Any help is appreciated.
>
> July 5 2010
>
>
>
> ------------------------------
> From: solarbikedz_at_[hidden]
> Date: Mon, 5 Jul 2010 13:17:27 -0700
> To: users_at_[hidden]
> Subject: Re: [OMPI users] Open MPI, cannot get the results from workers
>
>
> how does the master receive results from the workers? if a worker is
> sending multiple task results, how does the master knows what the message
> tags are ahead of time?
>
> On Sun, Jul 4, 2010 at 10:26 AM, Jack Bryan <dtustudy68_at_[hidden]>wrote:
>
> Dear All :
>
> I designed a master-worker framework, in which the master can schedule
> multiple tasks (numTaskPerWorkerNode) to each worker and then collects
> results from workers.
>
> if the numTaskPerWorkerNode = 1, it works well.
>
> But, if numTaskPerWorkerNode > 1, the master cannot get the results from
> workers.
>
> But, the workers can get the tasks from master.
>
> why ?
>
>
> I have used different taskTag to distinguish the tasks, but still does not
> work.
>
> Any help is appreciated.
>
> Thanks,
>
> Jack
>
> July 4 2010
>
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> --
> David Zhang
> University of California, San Diego
>
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-- 
David Zhang
University of California, San Diego