Victorian Partnership for Advanced Computing

Tango is a large AMD Opteron system and is VPAC's fourth and largest cluster. Tango, now in its final configuration, has 95 compute nodes, each with two AMD Barcelona 2.3GHz quad core processors for a total of 760 CPUs.

This indicates a theoretical peak performance of almost 7 Teraflops.

Specifications

• 95 Compute Nodes, 760 CPUs (or more correctly, cores)
• Each node has 2 AMD 2356 Quad Core Opterons™, 32GB ram and 4 x 320GB disks (1.2TB scratch space)
• Infiniband Interconnect (~2µs measured MPI latency)
• CentOS 5 Linux

Tango's architecture is similar to Wexstan, but on a much larger scale.

Compilers

The GNU Compiler Collection (gcc, g++, gfortran) is provided standard as part of the CentOS 5 installation, but we also have include both the Portland Group and Intel compiler suites for better code optimisation.

Recommended Portland Group (PGI) Compiler Flags

The recommended compiler flags for the Portland Group compilers are:

-fastsse -tp k8-64,barcelona-64 -Mipa=fast

To link in the AMD Core Math Libraries add this to your link command:

-l acml