X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/gpc2011.git/blobdiff_plain/b256cbbe74f6a42b77afa0e7ceddfdec3414f510..5dbaf996c90ccc620e75940ea63f0cda19ea4071:/xwch.tex

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 %------------------------------------
 % The XtremWeb-CH environment
 %------------------------------------
+
+High performance computing environments like MPI (Message Passing
+Interface) \cite{Gro94} are widely used and have proved their efficiency. This
+class of systems are very tightly coupled and powerful but not very error
+tolerant. Cluster computing environments like Condor
+\cite{condor-practice} and volunteer computing systems like BOINC \cite{boinc} are loosely coupled and
+have a scheduler that distributes tasks to computing nodes. Cluster
+computing environments assume that nodes are most often accessible
+which is not applies to volunteer computing systems.
+
 XtremWeb-CH (XWCH) is a volunteer computing inspired large-scale
-computing platform for distributed applications. It consists in three
-components: one coordinator, a set of workers and at least one
+computing platform for distributed applications. In fact, it tends to
+be a good compromise between cluster computing and volunteer
+computing.  It is originaly based on another platform called XtremWeb
+ \cite{xtremweb}. It is easy to install and maintain and it is supported by a Grid
+middleware (ARC \cite{arc}) and a workflow engine (JOpera \cite{JOpera}).  It consists in
+three components: one coordinator, a set of workers and at least one
 warehouse. Client programs use these components.
 
 The coordinator is the main component of the XWCH platform. It