correction ortho nabil

[gpc2011.git] / xwch.tex

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@@ -1,9 +1,24 @@
 %------------------------------------
 % The XtremWeb-CH environment
 %------------------------------------
 %------------------------------------
 % 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 the fact that nodes are in general
+directly accessible, one to another, but this does not apply to
+volunteer computing systems.
+

 XtremWeb-CH (XWCH) is a volunteer computing inspired large-scale
 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, 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
 warehouse. Client programs use these components.
 
 The coordinator is the main component of the XWCH platform. It