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

[Pavan Balaji]

You can use the MPICH_ASYNCH_PROGRESS=1 environment variable to do this.

  -- 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> 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
>> Email: jiechen at mcs.anl.gov
>> Homepage: http://www.mcs.anl.gov/~jiechen
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>
>
>

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji