Charm++ parallel programming system

[Gengbin Zheng <gzheng AT illinois.edu>]

Hi François,

  Can you describe how you use MPI function in a load balancer?
  Charm++'s load balancer is called at runtime system level, which does not have the AMPI thread context, so in general you can not make AMPI calls inside load balancers (if you write your own load balancer).

Gengbin

On 2/25/2015 9:49 AM, François Tessier wrote:

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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