Jaguar is a Cray XT containing a combination of XT3 and XT4 systems. It is provided as a primary system in the National Leadership Computing Facility (NLCF).
The current Jaguar installation has a total of 11,706 processor nodes. Of those, 11,508 are configured as compute nodes and the remainder provide I/O and login services. Each of the compute nodes contain 2.6 GHz dual-core AMD Opteron processors and 4 GB of memory. The service nodes consist of a 2.6 GHz dual-core AMD Opteron processor with 8 GB of memory. The system provides an aggregate peak performance of over 119 Teraflops with approximately 46 terabytes of aggregate memory. The system has approximately 600 TB of scratch disk space available for use in the lustre filesystem.
Each node is connected to a Cray Seastar router through Hypertransport, and the Seastars are all interconnected in a 3D-torus topology. The resulting interconnect has very high bandwidth, low latency, and extreme scalability.
The operating system is UNICOS/lc, which is a combination of Linux on the service nodes and the Catamount microkernel on the compute nodes. Catamount is designed to minimize system overhead, thus allowing scalable low-latency global communication.
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