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Status of the Dynamo Use Case as prepared by Michael Braun

Status of the Dynamo Use Case as prepared by Michael Braun. Frank Breitling 5 th AstroGrid-D Meeting, MPE Garching 14./15. November 2006. Dynamo. Program for modeling of turbulent dynamos in planets, stars and galaxies,

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Status of the Dynamo Use Case as prepared by Michael Braun

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  1. Status of the Dynamo Use Case as prepared by Michael Braun Frank Breitling 5th AstroGrid-D Meeting, MPE Garching 14./15. November 2006

  2. Dynamo • Program for modeling of turbulent dynamos in planets, stars and galaxies, i.e. solving the induction equation with turbulent electromotive forces • Numerical Methods • finite differences • fixed grid

  3. Hard & Software Requirements Moderate: • Memory: 500 MB RAM • Local disk usage: <10 GB • Transfer of output: <10 GB • Execution time: < a few days • No network connection at runtime • Code is a single Fortran binary

  4. Preparation of Grid Taskfarming i.e. for the concurrent submission of multiple jobs with different input parameters: • A directory for each job containing input parameter files and the executable • Job description (XML) file, which defines the data transfer and the grid resources for the computation

  5. Job Submission & Monitoring Using the Globus Toolkit • Submit job to WS GRAM globusrun-ws –submit -b –f job.xml –J –S –o epr.xml • Status requests & monitoring globusrun-ws –status –j epr.xml globusrun-ws –monitor –s –j epr.xml

  6. Flowchart of Taskfarming (WS GRAM Multi-Job) Multi-Job Description XML XML Job EPR User Request Job Monitoring grid- proxy- init Submit Multi- Job Request Job Status Multi-Job Description Job EPR Grid Resource I Handle Status Info Provide Monitoring Data Accept Multi- Job Dele- gate 1. Job Dele- gate N. Job Single-Job Descriptions Input Data 1 Output Data 1 Task Grid Resource II Accept single Job File Stage-In Execute Task File Stage- Out Clean Up Input Data N Output Data N Send Files Task Grid Resource III File Stage-In Execute Task File Stage- Out Clean Up Accept single Job Send Output Files Request Files Save Output Data Save Output Data Deliver Data & Task Deliver Data & Task Grid Resource IV Input Data 1 Task Output Data 1 Output Data N Input Data N

  7. Job Description File (XML)of the Multi-Job Multi-Job Tag 1. Job Tag

  8. Grid Services • Used: • WS GRAM • GSIFTP • Useful but missing • Resource Brokering • Scheduling • File-Management • Information Service • No facilities like GAT or P2P are currently used

  9. Conclusion • Dynamo is Grid ready • Additional services could be helpful and convenient for the user

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