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{\large Ben Bergen \\
{\bf Applications Development for the Roadrunner Hybrid Supercomputer}}

2122 D 41st Street \\ Los Alamos \\ NM 87544
\\
{\tt bergen@lanl.gov}\end{center}

Roadrunner is a hybrid supercomputer that will be installed at Los Alamos
National Laboratory (LANL) in 2008. It will be the world's first general
purpose machine to achieve a sustained petaflop. Roadrunner reaches this
level of performance by boosting a conventional Opteron
cluster--of--clusters with IBM Cell processors. Prior to embarking on
this new architectural path, LANL commisioned the Roadrunner Advanced
Algorithms Team to adapt several important codes to Roadrunner's
projected architecture. The speedups demonstrated on prototype hardware
and software were part of the conclusion that a hybrid, heterogeneous
supercomputer is programmable and can support the Laboratory's national
security mission. This presentation describes the programming models and
selected techniques used by the Roadrunner Advanced Algorithms Team in
carrying out this work.


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