From: Arnaud Giersch Date: Thu, 24 Apr 2014 16:11:19 +0000 (+0200) Subject: Some remarks. X-Git-Tag: hpcc2014_submission~71 X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/hpcc2014.git/commitdiff_plain/3357d4486bff13d056f39c12f3852ef9c3dbe45b?ds=sidebyside Some remarks. --- diff --git a/hpcc.tex b/hpcc.tex index aa6eb7d..d376194 100644 --- a/hpcc.tex +++ b/hpcc.tex @@ -72,6 +72,7 @@ \RC{Ordre des auteurs pas définitif.} \begin{abstract} +\AG{L'abstract est AMHA incompréhensible et ne donne pas envie de lire la suite.} In recent years, the scalability of large-scale implementation in a distributed environment of algorithms becoming more and more complex has always been hampered by the limits of physical computing resources @@ -155,7 +156,7 @@ linear system of equations by numerical method GMRES (Generalized Minimal Residual) \cite{ref1}. We show, that with minor modifications of the initial MPI code, the SimGrid toolkit allows us to perform a test campaign of a real AIAC application on different computing architectures. The simulated -results we obtained are in line with real results exposed in ??\AG[]{??}. +results we obtained are in line with real results exposed in ??\AG[]{ref?}. SimGrid had allowed us to launch the application from a modest computing infrastructure by simulating different distributed architectures composed by clusters nodes interconnected by variable speed networks. With selected @@ -165,6 +166,9 @@ in the simulated environment, the experimental results have demonstrated not only the algorithm convergence within a reasonable time compared with the physical environment performance, but also a time saving of up to \np[\%]{40} in asynchronous mode. +\AG{Il faudrait revoir la phrase précédente (couper en deux?). Là, on peut + avoir l'impression que le gain de \np[\%]{40} est entre une exécution réelle + et une exécution simulée!} This article is structured as follows: after this introduction, the next section will give a brief description of iterative asynchronous model. Then, the simulation framework SimGrid is presented with the settings to create various @@ -187,7 +191,9 @@ times generated by synchronizations are very penalizing. One way to overcome thi \textit{Asynchronous Iterations~-- Asynchronous Communications (AIAC)} model. Here, local computations do not need to wait for required data. Processors can then perform their iterations with the data present at that time. Figure~\ref{fig:aiac} illustrates this model where the gray blocks represent the computation phases, the white spaces the idle -times and the arrows the communications. With this algorithmic model, the number of iterations required before the +times and the arrows the communications. +\AG{There are no ``white spaces'' on the figure.} +With this algorithmic model, the number of iterations required before the convergence is generally greater than for the two former classes. But, and as detailed in~\cite{bcvc06:ij}, AIAC algorithms can significantly reduce overall execution times by suppressing idle times due to synchronizations especially in a grid computing context. @@ -252,8 +258,11 @@ with their computing power, the interconnection links with their bandwidth and latency, and the routing strategy. The simulated running time of the application is computed according to these properties. +%%% TODO: add some words+refs about SimGrid's accuracy and scalability.} + \AG{Faut-il ajouter quelque-chose ?} -\CER{Comme tu as décrit la plateforme d'exécution, on peut ajouter éventuellement le fichier XML contenant des hosts dans les clusters formant la grille} +\CER{Comme tu as décrit la plateforme d'exécution, on peut ajouter éventuellement le fichier XML contenant des hosts dans les clusters formant la grille + \AG{Bof.}} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \section{Simulation of the multisplitting method}