Georg Hager's Blog

Random thoughts on High Performance Computing


Christie Louis Alappat wins the SC18 ACM Student Research Competition Award

Our PhD student Christie Louis Alappat just took first place in the ACM Student Research Competition at SC18. His work revolved around the “Recursive Algebraic Coloring Engine,” which is a new method and library for hardware-efficient graph coloring. This means that he will advance to the grand finale next year. Congratulations!

Christie’s project is part of the activities in ESSEX-II, a project funded by the German Science Foundation (DFG) within the priority programme SPPEXA.

As part of the competition, Christie has prepared a video with details about his work:


Intel Threading Building Blocks (TBB 2.0) on RRZE systems

Intel Threading Building Blocks (TBB 2.0) on RRZE systems
On Woody and Altix the current version of Intel’s TBB library is now installed. TBB is a C++ framework for shared-memory parallel programming. If you are fed up with marrying C++ and OpenMP, TBB might be the right choice. Use it by loading the tbb/2.0 or tbb/2.0-debug modules, respectively. On Cluster32 you can access the modules from Woody by typing, e.g., module use /apps/modules/modulefiles/libraries, but remember that we have only provided a 64 bit version. The library was compiled with the Intel compiler and we don’t guarantee that it will work with anything else. Documentation can be found on the TBB website:

We are very much interested in sharing experiences with all users of the library. So please if you have comments or questions, contact hpc@rrze.

Sun SPARC Enterprise T5120 at RRZE

As of this week we are proud owners of an UltraSPARC T2 system (1 socket @ 8 cores, 32 GB, 1.2 GHz). This one is a little slower than the 1.4 GHz machine we had access to at RWTH Aachen, but the characteristics are quite the same. After some intensive benchmarking, this machine will be made available in our test cluster for all HPC users to evaluate.