Jaguar

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Jaguar
Quad-Core Upgrade
The NCCS is pleased to announce that the Cray XT4, jaguar, has completed acceptance testing. At 08:00 on Monday, May 12, the system was returned to general availability. While use of the system will be similar to jaguarcnl and the 119 TF dual-core jaguar system, there are several important differences which may be found on the Differences Between Dual-Core and Quad-Core Usage page.
Transition from Jaguarcnl to Jaguar
Jaguarcnl was decommissioned at 08:00 on May 14. Users no longer have access to jaguarcnl or data that was in its /tmp/work filesystem.

Scratch file systems are not shared between jaguar and jaguarcnl. To aid in the transition between jaguar and jaguarcnl, data in /tmp/work on jaguarcnl was copied to /lustre/spider/jaguar_copy which is available from jaguar.
Jaguar
Jaguar is a Cray XT4 system. It is provided as a primary system in the Leadership Computing Facility (LCF)
Jaguar 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.
The compute nodes are running the Compute Node Linux (CNL) OS. CNL is designed to minimize system overhead, thus allowing scalable low-latency global communication.
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.