Dense Memory Cluster (DMC)

 

The DMC at the Alabama Supercomputer Center has 2216 CPU cores and 16 terabytes of distributed memory. Each compute node has a local disk (up to 1.9 terabytes of which are accessible as /tmp). Also attached to the DMC is a high performance Panasas storage cluster, which has 17 terabytes of high performance storage accessible as /scratch from each node. Home directories as well as third party applications use a separate Panasas Filesystem and share 47 terabytes of storage.

The machine is physically configured as a cluster of 8, 16, or 20 CPU core SMP boards. Ninety-six nodes have 2.26 GHz Intel quad-core Nehalem processors and 24 gigabytes of memory. Forty nodes have 2.3 GHz AMD 8-core Opteron Magny-Cours processors and 128 gigabytes of memory. Forty nodes have 2.5 GHz Intel 10-core Xeon Ivy Bridge processors and 128 gigabytes of memory.

The DMC has 32 NVIDIA GPU (Graphic Processing Unit) chips. These are a combination of: two Tesla S1070 units (external GPUs connected in pairs to four DMC nodes), four DMC nodes configured with two Tesla M2070 cards each, and four DMC nodes configured with four Tesla K20m cards each. These multicore GPU chips are similar to those in video cards, but are installed as math coprocessors. This can give significant performance advantages for software that has been adapted to use these processors. Thus the processing capacity of the DMC cluster is:

Conventional processing capacity - 29.52 TFLOPs
Single precision GPU capacity - 74.92 TFLOPs
Double precision GPU capacity - 23.53 TFLOPs