[mpich-discuss] Maximum number of communicators

[Nichols A. Romero]

I cannot reproduce this in a simple test code. I am convinced that this is an application error. I linked the application against mpiP and I see that the calls to Comm_create >> Comm_free by two to three orders of magnitude.

The application is template C++ and I suspect that the C++ class destructor is not properly calling Comm_free. 

----- Original Message -----
> From: "Dave Goodell" <goodell at mcs.anl.gov>
> To: discuss at mpich.org
> Sent: Sunday, February 24, 2013 3:36:54 PM
> Subject: Re: [mpich-discuss] Maximum number of communicators
> 
> Test code indeed would be helpful.
> 
> You may get better warnings about context ID and/or communicator
> leaks if you configure a stock MPICH with "--enable-g=all".
> 
> -Dave
> 
> On Feb 23, 2013, at 7:05 PM CST, Jeff Hammond wrote:
> 
> > It's 2048 in all MPICH2-derived implementations that I know about,
> > including the ones used on BGP and BGQ.
> > 
> > Since I know what your issue is already, I think the problem has
> > something to do with context id leaking.  You should post your test
> > code.
> > 
> > Jeff
> > 
> > On Sat, Feb 23, 2013 at 6:24 PM, Nichols A. Romero
> > <naromero at alcf.anl.gov> wrote:
> >> Hi,
> >> 
> >> What is the maximum number of communicators in the MPICH that is
> >> used on BG/P vs. that used on BG/Q?
> >> 
> >> Sent from my iPhone
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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
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-- 
Nichols A. Romero, Ph.D.
Argonne Leadership Computing Facility
Argonne National Laboratory
Building 240 Room 2-127
9700 South Cass Avenue
Argonne, IL 60490
(630) 252-3441