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

[Jeff Hammond]

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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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond