Charm++ parallel programming system

["Celso L. Mendes" <cmendes AT illinois.edu>]

Francois,

Since you say "I'm able to run the application without load
balancer or with the native ones.", it seems to me that the
problem arises because you're using MPI calls *inside* your
load balancer, is that correct? Are those calls really
essential to your balancer?

I don't think such a balancer (based on MPI) has been built
in the past, so this might be new territory in Charm++, but
probably someone at PPL could tell better than me.

-Celso


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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