Application Scaling Application Scaling Doug Kothe ORNL Paul

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Application Scaling

Application Scaling

Application Scaling • • • Doug Kothe, ORNL Paul Muzio, CUNY Jonathan Carter, LLBL

Application Scaling • • • Doug Kothe, ORNL Paul Muzio, CUNY Jonathan Carter, LLBL Bronis de Supinski, LLNL Mike Heroux, Sandia Phil Jones, LANL Brent Leback, The Portland Group Piyush Mehrotra, NASA Ames John Michalakes, NCAR Nir Paikowsky, Scale. MP Galen Shipman, ORNL Trey White, ORNL

Application Scaling • Are there more appropriate domain-specific performance metrics for science and engineering

Application Scaling • Are there more appropriate domain-specific performance metrics for science and engineering HPC applications available then the canonical percent of peak? • • • Or parallel efficiency and scalability? If so, what are they? Are these metrics driving for weak or strong scaling or both?

Application Scaling • • • What is the role of local (node-based) floating point

Application Scaling • • • What is the role of local (node-based) floating point accelerators (e. g. , cell, GPUs, etc. ) for key science and engineering applications in the next 3 -5 years? Is there unexploited or unrealized concurrency in the applications you are familiar with? If so, what, and where is it?

Application Scaling • • • Should applications continue with current programming models (Fortran, C,

Application Scaling • • • Should applications continue with current programming models (Fortran, C, C++, PGAS, etc. ) and paradigms (e. g. , flat MPI, hybrid MPI/Open. MP, etc. ) over the next decade? If not, what needs to change? How might HPC system-attribute priorities change over the next decade for the science and engineering applications you are familiar with?

Application Scaling • Attributes to consider are: – – – node peak flops mean

Application Scaling • Attributes to consider are: – – – node peak flops mean time to interrupt wide-area network bandwidth node memory capacity local storage capacity archival storage capacity memory latency interconnect latency disk latency interconnect bandwidth memory bandwidth disk bandwidth