WebCom-G and MPICH-G2 Jobs

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Padraig J. O'Dowd
Adarsh Patil
John P. Morrison


This paper discusses using WebCom-G to handle the management & scheduling of MPICH-G2 (MPI) jobs. Users can submit their MPI applications to a WebCom-G portal via a web interface. WebCom-G will then select the machines to execute the application on, depending on the machines available to it and the number of machines requested by the user. WebCom-G automatically & dynamically constructs a RSL script with the selected machines and schedules the job for execution on these machines. Once the MPI application has finished executing, results are stored on the portal server, where the user can collect them. A main advantage of this system is fault survival, if any of the machines fail during the execution of a job, WebCom-G can automatically handle such failures. Following a machine failure, WebCom-G can create a new RSL script with the failed machines removed, incorporate new machines (if they are available) to replace the failed ones and re-launch the job without any intervention from the user. The probability of failures in a Grid environment is high, so fault survival becomes an important issue.

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