From: raphael couturier Date: Mon, 8 Dec 2014 15:55:53 +0000 (+0100) Subject: new X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/Krylov_multi.git/commitdiff_plain/449b7d392138a9740fe87dd5f51c34ee5b5fccfb?ds=inline;hp=c9242f9fee68ee32282c6b18679048eb4c3056b4 new --- diff --git a/review.txt b/review.txt index 06e7a8c..c1e5f56 100644 --- a/review.txt +++ b/review.txt @@ -38,10 +38,14 @@ In this work we develop a new parallel two-stage algorithm for large-scale clust 2. Given that the focus of the paper is to provide a better solution on a well known problem with several well studied approaches. It is essential for the author to provide extensive comparison studies with those approaches. In Section 4 the paper provides some experiments with very limited scope (solving one simple problem and comparing with one well known problems). This seems not enough. Another way is to provide a qualitative comparison against other proposed approaches and explain why the proposed approach is better. But this is also not found. `---- +tentative de réponse : In fact, the machine we have used, almost one year ago, is not accessible anymore, it is been reformed. In this paper, we show that, for a very well known problem, the 3D Poisson problem that is used in many simulations, our method is more efficient than the GMRES method which is a very well known method. + ,---- 3. It is better if the paper can provide a quantitative study on the speed-up achieved by the proposed algorithm so that the reader can get insights on how much is the performance improvement in theory. `---- +With all numerical methods, the converge is a very difficult problem. In this study, we show that a very simple method can provide faster result than the GMRES method. Of course, many theoretical works need to be added, but it take a very long time and this is out of the scope of this paper. + ,---- 4. In Section 3. it is better if the paper can explain the intuition of multi-splitting. Currently it is more like "Here is what I did" presentation but "why do we do this" is left for the reader to guess. `---- @@ -52,6 +56,8 @@ We have used the well-known GMRES method to solve locally in parallel each block The main principle of the multisplitting methods is defined in Section 2. Section 3 presenting our two-stage algorithm is little modified to show our motivations to mix between the multisplitting methods and Krylov iterative methods. +RAPH : on peut modifier des trucs pour répondre dans le papier? ca serait bien :-) + **************************************************** * Reviewer #3 *