[mpich-discuss] Can I enable/disable asynchronous progress in my code?

[Pavan Balaji]

Sorry, I misread the original email.  And apparently can't spell either.

  -- Pavan

On 09/07/2012 05:11 PM, Jed Brown wrote:
> On Fri, Sep 7, 2012 at 5:06 PM, Pavan Balaji <balaji at mcs.anl.gov
> <mailto:balaji at mcs.anl.gov>> wrote:
>
>
>     You can use the MPICH_ASYNCH_PROGRESS=1 environment variable to do this.
>
>
> What? Besides being spelled MPICH_ASYNC_PROGRESS, this is only checked
> in MPI_Init/MPI_Init_thread so it doesn't help Jie who wants to change
> it during different phases of his simulation.
>
>
>       -- Pavan
>
>
>     On 09/07/2012 05:04 PM, Jeff Hammond wrote:
>
>         You could do something like this:
>
>         pthread_t progress_thread;
>
>         void progress_engine
>         {
>             while(1)
>             {
>                MPI_Test(..);
>              }
>             return;
>         }
>
>         void start_my_progress_engine(void)
>         {
>             progress_thread = pthread_create(.., &progress_engine,..);
>             return;
>         }
>
>         void stop_my_progress_engine(void)
>         {
>             pthread_kill(&progress_thread)__; /* if this type of call
>         doesn't
>         exist, then there's another way to do it... */
>             return;
>         }
>
>         This is far from correct C or use of the Pthreads API but it is a
>         crude approximation to how the MPICH2 progress engine works
>         internall,
>         except you get to control this one.
>
>         MPI_Test should poke a real request that will never be satisfied
>         until
>         finalization.
>
>         If you have any trouble, I'm sure one of us can give you a better
>         implementation.  I can just write a working one later in the week.
>
>         One can imagine MPIX-ing this into MPICH2 properly.  I'm sure
>         everyone
>         has more important things to do but if MPICH guys tell me they would
>         accept a patch, I will make the MPIX at some point.
>
>         Best,
>
>         Jeff
>
>         On Fri, Sep 7, 2012 at 2:51 PM, Jie Chen <jiechen at mcs.anl.gov
>         <mailto:jiechen at mcs.anl.gov>> wrote:
>
>             It seems to me that the asynchronous progress for one sided
>             communications can only be enabled/disabled through
>             environment variables, and the state will be kept forever
>             during the lifetime of a program. What if in the program I
>             want some part of it to use asynchronous progress while the
>             other part not? How can I achieve this?
>
>
>
>             --
>             Jie Chen
>             Mathematics and Computer Science Division
>             Argonne National Laboratory
>             Address: 9700 S Cass Ave, Bldg 240, Lemont, IL 60439
>             Phone: (630) 252-3313 <tel:%28630%29%20252-3313>
>             Email: jiechen at mcs.anl.gov <mailto:jiechen at mcs.anl.gov>
>             Homepage: http://www.mcs.anl.gov/~__jiechen
>             <http://www.mcs.anl.gov/~jiechen>
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>
>
>
>
>     --
>     Pavan Balaji
>     http://www.mcs.anl.gov/~balaji
>
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji