Computing Resources Available to the Group

Information on decommisioned Twister/Gust/Front/Stratus cluster as well as their data can be found here.

CAPS Compute/Storage Server Cluster

CAPS operates several general-purpose Linux server that are linked together via filesystem cross mount. They are Cyclone, Tornado and (to be linked together).

The configurations of these machines are:

Cyclones: 8 dual-core 2.6 Ghz AMD Opteron processors (total 16 cores) and 32 GB memory.
Tornado: 2 dual-core 2.4 Ghz AMD Opteron processors (total 4 cores) and 16 GB memory.
Vortex: Two 2.2 ghz AMD Opteron 248 processors and 8 GB memory.

Both Intel f90 compiler (ifort) and Portland Group's pgf90 are available on these machiens.

Executables generated with pgf90 compiler are faster on AMS processors.

Add -f pgf90 option for makearps to invode pgf90 compilter. ifort is the default in makearps. Command is makearps -f pgf90 arps. If you are not sure which compiler you used to create *.o files you already have, do makearps clean first.

File systems available include /home, /data0, /data1 and data2 on Tornado and Cyclone, /vorraid1 and /vorraid2 on Vortex.

/home is a native filesystem of Cyclone and /data0, /data1 and /data2 are native filesystems on Tornado.

None of the filesystems are backed up. All of them are raid 5 arrays - that is, if one of the many disks in the array fails, data is in theory recoveable.

The byte order of native binary data on Linux machines is little endian. Compiler switches are available with pgf90 (-byteswapio) and ifort (-convert big endian) to force big endian I/O so that the data is compatible with big endian machines. makearps defaults to big endian I/O for programs managed by makearps.

OSCER supercomputer, Topdawg, a 1000+ CPU Linux machine is regularly used by CAPS students and scientists. See OSCER web site for system info on the systems.

We also use Bigben of Pittsburg Supercomputing Center extensively ( Bigben is a Cray XT3 system running Linux-bases OS. It has 2000+ dual-core 2.6 AMD Optron processors, with a total of 4000+ processors. Each dual-core node has only 2GB memory, however. It's suitable for large production jobs. PSC has mass storage of essentially unlimited space - it's good for permanant storage of large data sets. We also have significant allocations on NCSA's Abe (quad-core Intel processor-based Linux machine) and SGI Altix Cobalt (a shared-memory-capable system based on Intel Itanium 2 processors) see We also have allocations on the 629760-core (AMD 2.2 Ghz quad-core Optron) Range of Texas Advanced Computing Center (TACC,, and on the IBM p-655 and p-690 AIX Datastar supercomputers (

For system management problems, e-mail Don Guiano ( and Scott Hill (