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Holding slide prior to starting show. A Portlet Interface for Computational Electromagnetics on the Grid. Maria Lin and David Walker Cardiff University. Project Collaborators. Cardiff University Swansea University BAE Systems HP Singapore Institute of HPC. Outline.

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  1. Holding slide prior to starting show

  2. A Portlet Interface for Computational Electromagnetics on the Grid Maria Lin and David Walker Cardiff University

  3. Project Collaborators • Cardiff University • Swansea University • BAE Systems • HP • Singapore Institute of HPC

  4. Outline • Project Overview and Challenges • Design • Gecem Portal and Portlets • Portal and Security • Use Case • Future Work • Conclusion

  5. Project Objective • Develop a user-friendly environment for users to integrate mesh generation, large-scale linear system solver, and collaborative visualization within a Web service framework. • Problem domain is computational electromagnetics

  6. UWS BAE SYSTEMS Geometry data Create geometry Generate mesh Other locations Output Mesh Output Output WeSC CEM simulation GECEM Prototype Grid

  7. UWS BAE SYSTEMS Geometry data Create geometry Generate mesh Output Mesh Output Output Singapore CEM simulation GECEM Production Grid Other locations

  8. Challenges • Resources are intrinsically distributed • No sharing of software and hardware • Sharing data • Requirements • Single logon to multiple machines • A user friendly interface • Secure environment • Support Multi-user

  9. Previous Work • Use a shell-script to call Global Toolkit 2.0 • User account handling is complex • Not user-friendly

  10. Current Approach • Use a portlet approach • Use GridSphere Portal framework • Use portlet service models provided by GridPortlets • Create GECEM portlets to locate input files and services and to submit jobs

  11. Portlet Design • Programmed in Java • User-interface component • Handles user requests and generates dynamic content in the form of markup fragments that can be aggregated with other fragments to form a portal page • A portlet is a window to provide a specific service • Easy to customize for individual users or groups of users

  12. Portlets • Visible active components users see within their portal pages • Java servlet inside a portal • A special type of servlets • The Portlet API extends and subclasses the Servlet API

  13. GridSphere • Provide a portlet container • Provide user management, session management, and group management • Provide support for role-based access control • Provide portlet subscription • Provide layout selection • Allow third-party portlet

  14. Grid Portlets • Resource Browser Portlet • Resource Registry • Credential Retrieval Portlet • Credential Management uses credential repository to store user credentials • Provide File Browser Portlet • Easy to use for invoking OGSA Reliable File Transfer (RFT) Service

  15. GECEM portlets • Select machine for mesh services and solver service • Select geometry file from a list of machines • Invoke OGSA grid service for job submission

  16. GECEM Portal • Supports surface mesh generation • Supports volume mesh generation • Supports CEM solver migration • Supports collaborative visualisation and analysis

  17. Aspects • Accessbility of CEM solver codes • High quality • Significant investments of time and money • Owner may not want to install codes permanently on computers outside of their organisation

  18. CEM solver service • Support migration of codes to a target machine • execute • Send output to solution archive • Delete codes and data sets

  19. Workflow Geometry data Geometry Archive Surface Mesh service Surface Mesh Archive Volume Mesh Service Volume mesh archive CEM Solver Service Solution archive Solution data

  20. Portal and Security • Based on Globus Security Infrastructure for authentication • Provides single sign-on • Use grid credentials • Use proxy certificate • Use MyProxy Credential Repository • Use MyProxy Upload Tool

  21. Logon using MyProxy • User upload their credential to a MyProxy Server • User Logon the Gecem Portal using the MyProxy username and passphrase • Login Portlet retrieves the credential from the MyProxy Server and creates a credential mapping for the user • GridPortlet stores the credential into a credential repository

  22. Design Surface Mesh Service MyProxy Server Volume Mesh Service CEM Solver Service GECEM portal Archives

  23. Use Case BAE Swansea WeSC Geometry Data files Mesh Service Meshes Solver control files Solver Migrate Solver Service Solver Output

  24. Current Version • Use Gridsphere 2.0.2 as the portlet-based portal • Use Gridportlets (cvs version)

  25. Prerequisite Software Java 2 Standard Edition version 1.4.2 or higher.  Tomcat 4.1.31 Apache Ant version 1.6.2 Globus Toolkit (GT3.2.1) Software

  26. Related Work • Geodise toolkit • P-GRADE • GEMLCA

  27. Work In Progress • Archiving results • Use UDDI for service discovery • Apply RAVE for visualization

  28. Future Work • Use workflow model • Adapt our framework to WSRF • Extend GECEM grid to include all project partners

  29. Conclusion • Portal provides a high-level user interface for scientists to access distributed resources easily • Portal hides away the complexity of using grid • User can access the portal anywhere

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