Jaguar
| Jaguar |
Jaguar is a Cray XT containing a combination of XT3 and XT4 systems. It is provided as a primary system in the Leadership Computing Facility (LCF).
The system is currently divided into two separate partitions.
- Jaguar
- The Jaguar partition system has a total of 7,832 XT4 compute nodes in addition to input/output (I/O) and login service nodes. Each compute node contains a quad-core 2.1 GHz AMD Opteron processor and 8GB of memory. Aggregate system performance is approximately 250 TF. Approximately 600 TB are available in the scratch filesystems. The service nodes consist of a 2.6 GHz dual-core AMD Opteron processor with 8 GB of memory.
- Jaguarcnl
- The Jaguarcnl partition has a total of 3,744 XT3 compute nodes in addition to I/O and login service nodes. Each of the compute nodes contain 2.6 GHz dual-core AMD Opteron processors and 4 GB of memory.
Both systems are running Compute Node Linux (CNL) on the compute nodes. CNL is designed to minimize system overhead, thus allowing scalable low-latency global communication.
In both systems, each node is connected to a Cray SeaStar router through HyperTransport, and the SeaStars are all interconnected in a
3-D-torus topology. The resulting interconnect has very high bandwidth, low latency, and extreme scalability.
Quad-Core Migration: Differences Between Dual-Core and Quad-Core Usage