From: couturie <couturie@extinction>
Date: Wed, 8 Jan 2014 15:03:48 +0000 (+0100)
Subject: ajout
X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/Krylov_multi.git/commitdiff_plain/ed256d49ed3a06f1ca791baf04262e8775091cd0

ajout
---

diff --git a/biblio.bib b/biblio.bib
index d1f3b00..55c4a93 100644
--- a/biblio.bib
+++ b/biblio.bib
@@ -72,4 +72,12 @@
   pages={380--391},
   year={2008},
   publisher={Elsevier}
-}
\ No newline at end of file
+}
+
+@TechReport{prace-multi,
+	author = 			 {Nick Brown and J. Mark Bull and Iain Bethune},
+	title = 			 {Solving Large Sparse Linear Systems using Asynchronous Multisplitting},
+	institution =  {PRACE White paper n°WP84},
+	year = 				 {2013},
+}
+
diff --git a/krylov_multi.tex b/krylov_multi.tex
index 963ce3e..40380d0 100644
--- a/krylov_multi.tex
+++ b/krylov_multi.tex
@@ -108,15 +108,15 @@ Jacobi method.
 A general framework  for studying parallel multisplitting has  been presented in
 \cite{o1985multi} by O'Leary and White. Convergence conditions are given for the
 most general case.  Many authors improved multisplitting algorithms by proposing
-for  example  a  asynchronous  version  \cite{bru1995parallel}  and  convergence
-condition  \cite{bai1999block,bahi2000asynchronous}   in  this  case   or  other
-two-stage algorithms~\cite{frommer1992h,bru1995parallel}
+for  example  an  asynchronous  version  \cite{bru1995parallel}  and  convergence
+conditions  \cite{bai1999block,bahi2000asynchronous}   in  this  case   or  other
+two-stage algorithms~\cite{frommer1992h,bru1995parallel}.
 
 In  \cite{huang1993krylov},  the  authors  proposed  a  parallel  multisplitting
 algorithm in which all the tasks except  one are devoted to solve a sub-block of
 the splitting  and to send their  local solution to  the first task which  is in
 charge to  combine the vectors at  each iteration.  These vectors  form a Krylov
-basis for  which the first tasks minimize  the error function over  the basis to
+basis for  which the first task minimizes  the error function over  the basis to
 increase the convergence, then the other tasks receive the update solution until
 convergence of the global system. 
 
@@ -127,7 +127,11 @@ of multisplitting algorithms that take benefit from multisplitting algorithms to
 solve large scale linear systems. Inner  solvers could be based on scalar direct
 method with the LU method or scalar iterative one with GMRES.
 
-
+In~\cite{prace-multi},  the  authors  have  proposed a  parallel  multisplitting
+algorithm in which large block are solved using a GMRES solver. The authors have
+performed large scale experimentations upto  32.768 cores and they conclude that
+asynchronous  multisplitting algorithm  could more  efficient  than traditionnal
+solvers on exascale architecture with hunders of thousands of cores.
 
 
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