Charm++ parallel programming system

["Totoni, Ehsan" <totoni2 AT illinois.edu>]

Hi François,

Are you compiling that library (which has MPI calls) with ampiCC? 

Thanks,

-Ehsan

---

From: ppl-bounces AT cs.uiuc.edu [ppl-bounces AT cs.uiuc.edu] on behalf of François Tessier [francois.tessier AT inria.fr]
Sent: Wednesday, February 25, 2015 9:49 AM
To: charm AT cs.uiuc.edu
Subject: Re: [ppl] [charm] AMPI Application + MPI-based load balancer

Hello,

I've just started again to work on that and the problem is still there... Here is a summary :

I'm working on a topology-aware load balancer. My algorithm contains a part of code written with MPI.

I would like to try this load balancer on the AMPI version of Ondes3D, a simulator of seisimical wave propagation, on Blue Waters. To run this application, I build AMPI like that on a new Charm++ checkout : ./build AMPI mpi-crayxe (while linking with some libraries). I'm able to run the application without load balancer or with the native ones. However, when I carry out this experiment with my load balancer, it fails with this error :

Reason: Cannot call MPI routines before AMPI is initialized.

Is there something special to do to use MPI functions in a load balancer with AMPI ?

Thanks for you help

François

Dr. François TESSIER
University of Bordeaux
Inria - TADaaM Team
Tel : 0033524574152
francois.tessier AT inria.fr
http://runtime.bordeaux.inria.fr/ftessier/
PGP 0x8096B5FA

On 09/12/2014 19:25, François Tessier wrote:

Celso,

Yes, the declaration is in the file containing the "main()" function.
But I noticed a new behavior today. On a new allocation on Blue Waters,
I was able to run the application and my load balancer with success.
I've just carried out the application on another node and I have the
same problem as exposed yesterday. It seems to be dependant of the Blue
Waters nodes... That's weird.

François

François TESSIER
PhD Student at University of Bordeaux
Inria - Runtime Team
Tel : 0033524574152
francois.tessier AT inria.fr
http://runtime.bordeaux.inria.fr/ftessier/
PGP 0x8096B5FA

On 09/12/2014 00:01, Celso L. Mendes wrote:

Francois,

Do you have the declaration of the #include for "mpi.h" in the
same file where MPI_Init() is invoked? Is this really the same
file where "main()" is defined?

-Celso


On 12/8/2014 4:30 PM, François Tessier wrote:

There is a MPI_Init() at the beginning of the main function in the
application's code. Is it enough to use MPI in my load balancer ?
There is no MPI_Finalize() during the execution. The only one is at the
end of the main function.

++

François



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