2. Visual Solution to High Performance Computing Computer and Automation Research Institute Laboratory of Parallel and Distributed Systems http://www.lpds.sztaki.hu/pgrade

3. The Big Issue Sequential program code C, C++ Fortran Parallel program code ? Parallelization? Debugging? Performance? Execution?

4. Distributed supercomputing with P-GRADE Parallel Grid Run-time and Application Development Environment (P-Grade) The first highly integrated parallel application development system for Grid and clusters Provides: –Parallel, supercomputing programming –Fast and efficient development –Observation and visualization –Fault and performance analysis  ON CLUSTERS  ON SUPERCOMPUTERS  IN THE GRID

5. DESIGN: Three hierarchical layers for easy parallelisation Application window Process window Text window

6. DESIGN: Built-in Communication Templates for fast design

7. DEBUGGING: Hierarchical control and views to eliminite programming errors

8. DEBUGGING: Macrostep-by-macrostep…  Support for systematic debugging to handle non- deterministic behaviour of parallel applications  Automatic dead-lock detection  Replay technique with collective breakpoints  Active control: generation of Execution Trees  Testing parallel programs by temporal logic assertions

9. MONITORING: statistics and event traces for performance evaluation Collection of both statistics and event traces Application monitoring and visualization in the Grid Evaluation of long-running programs based on semi- on-line trace collection Support for debugger in P-GRADE by execution visualisation

10. PERFORMANCE VISUALIZATION: Visualization of Event Traces User controlled focus on processors, processes and messages

11. P-GRADE: Stages of Software Development and Execution Execution Design, debugging Performance- analyzis Grid & Cluster & Supercomputer

12. Application I: Ultra-short range weather forecast (Hungarian Meteorology Service) 25 x 10 x25 x5 x Forecasting dangerous weather situations (storms, fog, etc.), crucial task in the protection of life and property Processed information: surface level measurements, high-altitude measurements, radar, satellite, lightning, results of previous computed models Requirements: Execution time < 10 min Higher resolution Result

13. Processing of satellite images Transformation Interpolation to basic GRID Processing: Altitude of clouds & Satellite raw image Receiving image

14. P-GRADE GUI DB P-GRADE in meteorology demonstrated at Euro-Par 2003 conference Hungarian Meteorological Service P-GRADE - RS CONDOR-PVM Parallel execution and Monitoring TRACE & Results Jobsubmission Input

15. Workflow support (in the Grid) Illustrated using the meteorological application Job Secure data transfer Input files Monitorin g of Workflow Monitorin g of Job

16. APPLICATION II: Urban traffic simulation (University of Westminster)

17. Checkpointing and migration of P-GRADE programs between clusters Budapest, MTA SZTAKI London-UoW 4 P-GRADE Program Runs at UoW cluster 3 P-GRADE program migrates to London as a Condor job SZTAKI & BUTE Clusters overloaded CHECKPOINTING SZTAKI & BUTE P-GRADE GUI P-GRADE program Submitted to Budapest as a Condor job 1 2 P-GRADE program Runs at SZTAKI cluster

18. Monitoring & visualisation - job migration in the Grid - Slow-down of simulator job due to overloaded cluster Migration of job between clusters in the GRID

19. Summary: Advantages of P-GRADE  Effective and efficient support for each stage of the parallel program development  Fast parallelization of existing algorithms  Reusability of sequential code  Hiding of low level communication functions  Integrated graphical concept  Predefined communication templates  Support for hierarchical design  Even non-professional programmers can use it (without a steep learning curve)  Portability (supercomputers, PC clusters, Grid)

20. Parallel Grid Run-time and Application Development Environment