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WP2 – Grid Application Programming Environment Task 2.2 – MPI Code Debugging and Verification D2.5 - Second Prototype of

WP2 – Grid Application Programming Environment Task 2.2 – MPI Code Debugging and Verification D2.5 - Second Prototype of MARMOT Bettina Krammer, Matthias Müller krammer@hlrs.de , mueller@hlrs.de University of Stuttgart High-Performance Computing-Center Stuttgart (HLRS) www.hlrs.de

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WP2 – Grid Application Programming Environment Task 2.2 – MPI Code Debugging and Verification D2.5 - Second Prototype of

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  1. WP2 – Grid Application Programming EnvironmentTask 2.2 – MPI Code Debugging and VerificationD2.5 - Second Prototype of MARMOT Bettina Krammer, Matthias Müller krammer@hlrs.de, mueller@hlrs.de University of Stuttgart High-Performance Computing-Center Stuttgart (HLRS) www.hlrs.de MARMOT – Second Prototype

  2. Deliverable D2.5 (PM 24) • Documentation of last year‘s work • Documentation of cooperation between different tasks and of integration work MARMOT – Second Prototype

  3. Objectives for next 12 months (Santiago, Feb 2003) • Feedback from users is required • Fortran interface • Use applications from tasks 1.2, 1.3 and 1.4 to test Marmot • Use benchmarks from task 2.3 to test Marmot • Full integration in the Grid environment • Performance measurements and improvements • Supplement documentation and user‘s manual • Dissemination • Debug the debugger in case of bug reports ;-) MARMOT – Second Prototype

  4. Use applications/benchmarks - feedback • Task 1.1 (biomed): • C application • since sunday in cvs • no tests, no feedback • Task 1.2 (flood): • Fortran application • shown in demo yesterday • integration procedure and feedback is a good contribution to D2.5 • Task 1.3 (hep): • ANN (C application) • no issues found by MARMOT MARMOT – Second Prototype

  5. Use applications from WP1/feedback (contd) • Task 1.4 (meteo): • STEMII (Fortran) • Last year, MARMOT detected holes in self-defined datatypes used in MPI_Scatterv/MPI_Gatherv. These holes were removed, which helped to improve the performance of the communication. • Task 2.3 (gridbench): • C/C++/Fortran • No tests so far • Logfiles may be uploaded to MARMOT‘s download area. • Description of tests and extracts of the logfiles will be part of D2.5. • Feedback is welcome. Try to use MARMOT yourselves. MARMOT – Second Prototype

  6. Integration in the Grid environment • Currently, Autobuild is working fine. • MARMOT has proved to run with applications in the testbed. • Integration with Migrating Desktop is going on. • CrossGrid Tutorial: a simple test program named cg-tutorial-marmot-exercise.c containing some erroneous calls can be found in CVS (together with a cg-tutorial-marmot-exercise.jdl). MARMOT – Second Prototype

  7. Performance measurements and improvements • gridbench (task 2.3) was not in cvs last year when we wanted to do our measurements. • MARMOT‘s overhead has been measured using e.g. the ANN-application and some of the NasPB • MARMOT‘s performance has been improved. • Rule of thumb: the higher the ratio of communication/computation, the higher the overhead of MARMOT. MARMOT – Second Prototype

  8. Dissemination/Documentation • Paper submissions to ParCo, Dresden 2003, Journal of Grid Computing (and ICCS, Krakau, june 2004). • Presentation of posters and brochures at several conferences (SC03,...) • Detailed publication list on MARMOT‘s homepage. • Our dissemination activities are reported in standard questionnaires. • Improvement of MARMOT‘s documentation. • D2.5 is a documentation of MARMOT, containing e.g. a user‘s manual, but it‘s only a snapshot. MARMOT‘s README etc. are regularly updated to provide all the information a user needs. MARMOT – Second Prototype

  9. Objectives for next 12 months (Santiago, Feb 2003) • Feedback from users is required still required • Fortran interface done • Use applications from tasks 1.2, 1.3 and 1.4 to test Marmot done • Use benchmarks from task 2.3 to test Marmot not done • Full integration in the Grid environment not fully done • Performance measurements and improvements done • Supplement documentation and user‘s manual done • Dissemination done • Debug the debugger in case of bug reports ;-) done MARMOT – Second Prototype

  10. Further work done • Extended functionality (checks performed on MPI calls) • Improved deadlock detection • Tests on different platforms, using different compilers and MPI implementations, e.g. • IA32/IA64 clusters • IBM Regatta • NEC SX5 • Hitachi SR8000 • Analysis of QA reports: some useful hints, but most issues have very low priority to us. • Preparation of D2.5 document: • first draft done before christmas • draft for internal review not finished yet MARMOT – Second Prototype

  11. Conclusions MARMOT is on track Thanks for your attention MARMOT – Second Prototype

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