Jaguar
| Jaguar |
A common external login system is now available for the XT systems.
The XT common external login nodes provide a single system external to each XT partition that allows users to access data, compile, and submit batch jobs regardless of the target partition’s state.
Interaction with the XT partitions through the common external login system is very similar to that of each partition’s internal login nodes. More information on the login system can be found here .
Jaguar is the primary system in the ORNL Leadership Computing Facility (OLCF).
- XT5 Partition
- The XT5 partition contains 18,688 compute nodes in addition to dedicated login/service nodes. Each compute node contains dual hex-core AMD Opteron 2435 (Istanbul) processors running at 2.6GHz, 16GB of DDR2-800 memory, and a SeaStar 2+ router. The resulting partition contains 224,256 processing cores, 300TB of memory, and a peak performance of 2.3 petaflop/s (2.3 quadrillion floating point operations per second).
- XT4 Partition
- The XT4 partition contains 7,832 compute nodes in addition to dedicated login/service nodes. Each compute node contains a quad-core AMD Opteron 1354 (Budapest) processor running at 2.1 GHz, 8 GB of DDR2-800 memory (some nodes use DDR2-667 memory), and a SeaStar2 router. The resulting partition contains 31,328 processing cores, more than 62 TB of memory, over 600 TB of disk space, and a peak performance of 263 teraflop/s (263 trillion floating point operations per second).
The SeaStar2+ router (XT5 partition) has a peak bandwidth of 57.6GB/s, while the SeaStar2 router (XT4 partition) has a peak bandwidth of 45.6GB/s. The routers are connected in a 3D torus topology, which provides an interconnect with very high bandwidth, low latency, and extreme scalability.
The operating system for Jaguar is the Cray Linux Environment. This consists of a full-featured version of Linux on the service nodes and the Compute Node Linux micro-kernel on the compute nodes. The micro-kernel is designed to minimize partition overhead allowing scalable, low-latency global communications.
