From: lilia Date: Thu, 11 Dec 2014 13:41:25 +0000 (+0100) Subject: 11-12-2014 v04 X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/Krylov_multi.git/commitdiff_plain/22203a7ac6e2f98336a298e1c875f1b0580f5769?ds=inline 11-12-2014 v04 --- diff --git a/krylov_multi_reviewed.tex b/krylov_multi_reviewed.tex index 936cdb6..978a03a 100644 --- a/krylov_multi_reviewed.tex +++ b/krylov_multi_reviewed.tex @@ -347,13 +347,22 @@ preconditioners are not scalable when using many cores. %%% MODIFIE *********************** %%%******************************** -We have performed some experiments on an infiniband cluster of 3 nodes of Intel Xeon CPU E5620 2.40 GHz and 12 GB of memory. For the GMRES code (alone and in both multisplitting versions) the restart parameter is fixed to 16. The precision of the GMRES version is fixed to 1e-6. For the multisplitting versions, there are two precisions, one for the external solver which is fixed to 1e-6 and another one for the inner solver (GMRES) which is fixed to 1e-10. It should be noted that a high precision is used but we also fixed a maximum number of iterations for each internal step. In practice, we limit the number of iterations in the internal step to 10. So an internal iteration is finished when the precision is reached or when the maximum internal number of iterations is reached. The precision and the maximum number of iterations of CGNR method used by our Krylov multisplitting algorithm are fixed to 1e-25 and 20 respectively. The size of the Krylov subspace basis S is fixed to 10 vectors. +We have performed some experiments on an infiniband cluster of 3 nodes of Intel Xeon quad-core CPU E5620 2.40 GHz and 12 GB of memory. For the GMRES code (alone and in both multisplitting versions) the restart parameter is fixed to 16. The precision of the GMRES version is fixed to 1e-6. For the multisplitting versions, there are two precisions, one for the external solver which is fixed to 1e-6 and another one for the inner solver (GMRES) which is fixed to 1e-10. It should be noted that a high precision is used but we also fixed a maximum number of iterations for each internal step. In practice, we limit the number of iterations in the internal step to 10. So an internal iteration is finished when the precision is reached or when the maximum internal number of iterations is reached. The precision and the maximum number of iterations of CGNR method used by our Krylov multisplitting algorithm are fixed to 1e-25 and 20 respectively. The size of the Krylov subspace basis S is fixed to 10 vectors. \begin{figure}[htbp] \centering - \includegraphics[width=0.7\textwidth]{strong_scaling_150x150x150} -\caption{Number of iterations per second with the same parameters as in Table~\ref{tab1} (weak scaling) with only 2 clusters} -\label{fig:01} + \includegraphics[width=0.8\textwidth]{strong_scaling_150x150x150} +\caption{Strong scaling with 3 blocks of cores} +\label{fig:001} +\end{figure} + +\begin{figure}[htbp] +\centering +\begin{tabular}{c} +\includegraphics[width=0.8\textwidth]{weak_scaling_280k} \\ (a) \includegraphics[width=0.8\textwidth]{weak_scaling_280K}\\ +\end{tabular} +\caption{Weak scaling with 3 blocks of cores} +\label{fig:001} \end{figure} %%%******************************** diff --git a/weak_scaling_280K.pdf b/weak_scaling_280K.pdf index 9bbd4da..a397491 100644 Binary files a/weak_scaling_280K.pdf and b/weak_scaling_280K.pdf differ diff --git a/weak_scaling_280k.pdf b/weak_scaling_280k.pdf index 73e3d62..a918356 100644 Binary files a/weak_scaling_280k.pdf and b/weak_scaling_280k.pdf differ