InteGrade is a grid middleware infrastructure that enables
the use of idle computing power from user workstations. One of its
goals is to support the execution of long-running parallel
applications that present a considerable amount of communication among
application nodes. However, in an environment composed of shared user
workstations spread across many different LANs, machines may fail,
become unaccessible, or may switch from idle to busy very rapidly,
compromising the execution of the parallel application in some of its
nodes. Thus, to provide some mechanism for fault-tolerance becomes a
major requirement for such a system. In this paper, we describe the
support for checkpoint based rollback recovery of parallel BSP
applications running over the InteGrade middleware. This mechanism
consists of periodically saving application state to permit to restart
its execution from an intermediate execution point in case of failure.
A precompiler automatically instruments the source-code of a C/C++
application, adding code for saving and recovering application state.
A failure detector monitors the application execution. In case of
failure, the application is restarted from the last saved global
checkpoint.