Hugh Merz

As of Aug. 2007 I am no longer a resident citazen, having joined SHARCNET.
I use to be the Scientific Parallel Programmer at CITA.

My current webpage, including contact information.

 Research Interests

Large N-Body simulations

CubePM - the successor to PMFAST, is a cubical decomposition 2-Level Particle-Mesh N-Body code. It has scaled up to 4096 processors on Blue Gene and 2048 cores on the TACC Sun Constellation Linux Cluster, with a current record of N = 2.9e+10. CubePM also contains lightly-tested TVD MHD and P3M functionality, a spherical overdensity halo-finder, and a parallel cosmological initial condition generator. Code downloads and documentation via the CubePM Repository.

Cluster Installation :: April 2007

I helped install the new CITA beowulf cluster, dubbed Sunnyvale. The cluster consists of 5-racks of 200 1-U Dell PowerEdge 1950 servers, for a total of 800GB of RAM and 1600 Intel Xeon E5310 cores. The cluster is diskless, a first at CITA. We used CentOS 4.4 as the base GNU/Linux operating system, then installed OSCAR 5.0 for the initial parallel administration and user-level software and finally made it an NFSroot r/o filesystem using OneSIS.

 Projects

• Jamboree 2006 Slides :: OpenOffice presentation, contains a list of my recent work
• Blue Gene Applications Paper: CubePM
• PMFAST :: 1-d decomposition distributed memory 2-level particle mesh N-Body code
• UberFS Parallel Cluster Filesystem
• Cubic decomposition MPI FFTW 3d fft wrapper

 Other Documents and Publications

• Introductory OpenMP and MPI Tutorial
• Computing Hints
• astro-ph preprint list
• Review of Scientific Instruments, Volume 75, Issue 4, pp. 873-877