1. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Experiences with GridWay on CRO NGI infrastructure Emir Imamagic, Srce EGEE User Forum 2009, Catania, Italy

2. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Overview Introduction CRO NGI Middleware User Community GridWay Why do we like it? How could we like it even more? Conclusion

3. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Introduction Initial grid national initiative in Croatia – 2003 (CRO-GRID) Providing a job management interface is crucial for attracting cluster user communities Started using GridWay in 2005 The best among very few (working) solutions Truly middleware-independent We met developers on EGEE Conference, Geneva, 2006

4. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 CRO NGI Grid infrastructure provided for academic & research purposes Government approved, permanent grid service Community 8 partners 23 user institutions 80 users 42 active users

5. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Current Status

6. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Middleware Sites Standard cluster environment (OSCAR distribution) Torque, Maui and SGE batch systems Ganglia monitoring system Grid Globus Toolkit 2 (GRAM, GridFTP) Globus Toolkit 4 (WS-GRAM, WS-MDS, RFT) Job metascheduling and management Condor-G with GRAM GridWay with WS-GRAM

7. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 User Community Traditional cluster users Applications: Gaussian (computational chemistry) Gromacs (molecular dynamics) ABINIT (computational chemistry) Povray & FFmpeg (graphic rendering) Intel Math Kernel Library (mathematics) NAG Fortran Libraries (mathematics) Home-grown applications

8. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 GridWay Grid Metascheduler Transparent job management over heterogeneous resources Enables integration with various middleware systems (e.g. Globus Toolkit, UNICORE, gLite, NorduGrid, …) Standards compliant OGF DRMAA API OGF JSDL Aligned with Globus Toolkit

9. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Why do we like it? Multiple middleware systems support Convenient for heterogeneous environments Enables transparent changes of underlying infrastructure Positive feedback from users Easy to use – similar to cluster & OS-level tools Job recovery in case of service/resource failures Advanced scheduling policies Fair share – complaint with cluster policy

10. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Why do we like it? Advanced job options Checkpointing – automatic storing of checkpoint on remote GridFTP server Performance tracking & automatic migration to better resources Modular & extendable Modifying job wrappers to suite our environment Possibility to add custom scheduling policy Open source Modifying core code is possible

11. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 How could we like it even more? Periodic glitches User proxy rejected (could not register user error) Problem with staging files (seems gone in 5.4) MADs performance Heavyweight MAD processes present even if no job is running (roadmap #4484)

12. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 How could we like it even more? Improved integration with underlying layers Adding more resource attributes for ranking and filtering (roadmap #4492) Passing attributes to underlying middleware, e.g. WS-GRAM extensions (roadmap #4491) Robustness Too sensitive to network failures Too sensitive to middleware glitches Jobs do not recover properly after restart (bug #5308)

13. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Conclusion GridWay – open grid metascheduling solution Enables more than best effort grid scheduling Suitable for heterogeneous grid environments with tendency to change

14. Experiences with GridWay on CRO NGI infrastructure / EGEE User Forum 2009 Thank You! Questions? http://www.cro-ngi.hr