Pegasus
Pegasus, which
stands for Planning for Execution in Grids, was developed at ISI as
part of the GriPhyN project. Pegasus is a configurable system that can
map and execute complex workflows on the Grid. Pegasus has been
integrated with the GriPhyN Chimera system. In that configuration,
Pegasus receives an abstract workflow (AW) description from Chimera,
produces a concrete workflow (CW), and submits it to Condor's DAGMan
for execution. The abstract workflow describes the transformations and
data in terms of their logical names. The concrete workflow, which
specifies the location of the data and the execution platforms, is
optimized by Pegasus from the point of view of Virtual Data. If data
products described within AW are found to be already materialized (via
queries to the Globus Replica Location Service (RLS)), Pegasus reuses
them and thus reduces the complexity of CW.
Subject: Chimera ProjectsList ScientificWorkflows