The Jaguar system has been through a series of upgrades since installation as a 25-teraFLOPS Cray XT3 in 2005. By early 2008, Jaguar was a 263-teraFLOPS Cray XT4. In 2008, Jaguar was expanded with the addition of a 1.4-petaFLOPS Cray XT5. By 2009, after an upgrade from 2.3 GHz 4-core Barcelona AMD processors to 2.6 GHz 6-core Istanbul AMD processors, the resulting system had over 200,000 processing cores connected internally with Cray's Seastar2+ network. The XT4 and XT5 parts of Jaguar are combined into a single system using an
InfiniBand network that links each piece to the Spider file system. Jaguar's XT5 partition contains 18,688 compute nodes in addition to dedicated login/service nodes. Each XT5 compute node contains dual hex-core
AMD Opteron 2435 (Istanbul) processors and 16
GiB of memory. Jaguar's XT4 partition contains 7,832 compute nodes in addition to dedicated login/service nodes. Each XT4 compute node contains a quad-core
AMD Opteron 1354 (Budapest) processor and 8 GiB of memory. Total combined memory amounts to over 360
terabytes (TB). Jaguar uses an external
Lustre file system called Spider for all file storage. The file system read/write benchmark is 240
GB/s, and it provides over 10
petabytes (PB) of storage. Hundreds of applications have been ported to run on the Cray XT series, many of which have been scaled up to run on 20,000 to 150,000 processor cores. The petaFLOPS Jaguar seeks to address some of the most challenging scientific problems in areas such as
climate modeling,
renewable energy,
materials science,
seismology,
chemistry,
astrophysics,
fusion, and combustion. Annually, 80 percent of Jaguar's resources are allocated through DOE's Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program, a competitively selected, peer-reviewed process open to researchers from universities, industry, government, and non-profit organizations. ==References==