Information Technology Reference
In-Depth Information
approach (e.g., by uploading existing i les, by the user providing data,
by using the CML dictionary), access to the WebDav-based i le system,
visualizing the cell structure using Jmol, enacting the workl ow, and
monitoring the workl ow. Second, the PipelinePilot [71] from Accelrys
has been adopted as a workl ow system, and a workl ow that orches-
trates services required for running a simulation in grid has been cre-
ated. An associated monitoring system has also been developed that can
monitor the status of both workl ow and simulation job. Third, Web ser-
vices integrated into the workl ow include a metascheduling service,
grid job submission and monitoring service, material property calcula-
tion service, metadata collection service and notii cation service. Fourth,
the Oracle Real Application Clusters has been used as a material prop-
erty database, and a WebDav-based i le system has been used to stage
data and provide an archive of all created data i les. Finally, chemical
markup language (CML) [73] has been incorporated in running the sim-
ulation within the environment.
The CASTEP [75] quantum mechanical simulation has been used to
test the prototype. The simulation job is submitted to the NW-Grid [74] or
the NGS Grid, and the whole job submission and simulation process are
automated by the workl ow. It has been demonstrated that the platform
provides an integrated environment where the grid-based CASTEP sim-
ulation job can be initiated from a Web browser and submitted to any
grid, the simulation output can be staged out to the i le system, and the
calculated material properties from the simulation can be stored into the
database. All these operations are orchestrated through the workl ow
without any human interactions.
11.5
This chapter introduces the portal and workl ow technologies that can be
employed in grid computing for application integration and service inte-
gration. The following topics in relation to grid-enabled portal/portal are
discussed: (1) the grid-enabled portal can take advantage of SSO, one
inherent feature of portals, to provide an integrated access platform to
resources and applications; (2) the portals is an ideal front end in grid
accounting systems; (3) a development model of using AJAX in portal
application is proposed to help address the issue that one portlet refresh
can result in other portlets refreshing at the same time; (4) in order to
provide a guideline for grid portal developers to choose an appropriate
toolkit, a survey on major grid portal development tools and technolo-
gies that can be employed to facilitate grid portal development has been
conducted.
Summary
 
 
Search WWH ::




Custom Search