Re: [Starpu-devel] Executing Cholesky with StarPU

[Samuel Thibault <samuel.thibault@inria.fr>]

Hello,

giorgos matheou, on jeu. 11 mai 2017 01:19:11 +0300, wrote:
> Hello. I have installed the StarPU framework and I would like to execute the
> distributed cholesky version. However I am little bit confused with the 
> command
> line arguments.
> 
> Actually, I would like to get strong scalability results, i.e. increase the
> number of nodes while the matrix size is the same.
> 
> So lets say that for the single node implementation the -size=8192 and the
> -nblocks=64, i.e. Matrix Size=8192x8192 and Tile Size=128x128
> 
> How should I configure the size and nblocks flags to have the same matrix 
> size
> for 2 nodes and 4 nodes?

The -size and -blocks parameters are for the whole matrix. So you just
need to change the mpirun/mpiexec invocation, the parameters of the
program can remain the same.

That being said, the cholesky example provided by StarPU is not
necessarily the state of the art. Chameleon provides an up-to-date
distributed implementation (which is notably able to check the result in
a scalable way)

Samuel