IBM's HPC Challenge Class 2 Entry

The IBM entry consisted of a UPC implementation of two benchmarks, Random Access and Stream Triad. The benchmarks were compiled using an experimental version of the IBM XLUPC compiler and run on the BlueGene/L machine.

In addition to the fact that this is the first time a UPC program has been scaled to more than a few hundred threads, the performance obtained using these simple codes is surpassed only by hand optimized algorithms for these benchmarks.

The IBM team:

• Calin Cascaval
• Kit Barton
• George Almasi
• Yili Zheng
• Montse Farreras
• Philip Luk
• Raymond Mak

The submission:

• Random Access code
• EP Stream Triad code
• Jury presentation

Summary of results:

Acknowledgements: This work was supported in part by DARPA Contract NBCH30390004. Our thanks go to the many other people who supported this project, In particular, we would like to thank Roch Archambault, Anthony Bolmarcich, Jose Castanos, Sid Chatterjee, John Gunnels, Manish Gupta, Roland Koo, Larry Lindsay, Fred Mintzer and Tom Spelce (LLNL).