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UPC at LBNL/U.C. Berkeley Overview

UPC at LBNL/U.C. Berkeley Overview. Kathy Yelick LBNL and U.C. Berkeley. UPC Team at Berkeley. Christian Bell: Myrinet conduit (away at school, returning in the Fall) Dan Bonachea: GASNet spec, MPI and Quadrics Wei Chen: UPC/Open54 compiler

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UPC at LBNL/U.C. Berkeley Overview

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  1. UPC at LBNL/U.C. BerkeleyOverview Kathy Yelick LBNL and U.C. Berkeley

  2. UPC Team at Berkeley • Christian Bell: Myrinet conduit (away at school, returning in the Fall) • Dan Bonachea: GASNet spec, MPI and Quadrics • Wei Chen: UPC/Open54 compiler • Jason Duell: Quadrics communication and UPC runtime layer implementation • Paul Hargrove: VIA, Infiniband, etc. • Parry Husbands: UPC Applications • Costin Iancu: UPC/Open64 compiler • Mike Welcome: IBM/SP communication, moving into applications • Kathy Yelick: PI

  3. Overview of UPC Effort Three components: • Compiler • Portable compiler infrastructure (UPC->C) • Explore optimizations: communication, shared pointers • Transfer technology to other UPC compilers • E.g., the HP compiler • Communication support for GAS languages • Performance evaluation: influence machine vendors • Tech transfer to ARMCI • Applications and benchmarks • Started with NAS PB (MG and CG) • Mesh generation application this year

  4. Progress this Year • The compiler is running! • Not gcc 2.9.6 dependent (mostly) • Backend changes for C code generator • GASNet implementations on Quadrics, Myrinet, and LAPI • New NAS applications: • NAS-compliant CG • MG done previously • New mesh generation application • Papers: • Network performance • Compiler evaluation • GASNet on Myrinet • Optimizations (underway)

  5. Agenda Agenda 12:30 Overview -- Kathy Yelick 12:50 UPC Translator and Runtime -- Wei Chen 1:20 GASNet -- Dan Bonachea and Mike Welcome 1:50 Break 2:00 Parallel Optimizations for UPC -- Costin Iancu 2:30 Applications -- Parry Husbands 3:00 Break 3:15 Hardware Discussion -- Paul Hargrove 3:45 Performance of Communication Networks -- Jason Duell 4:15 Discussion and Closing Remarks

  6. Future Plans (1) • Language • Consistency model • Progress guarantees • Array library (other versions of memcopy) • Hierarchical machine support • Teams • UPC++?

  7. Future Plans (2) • Translator: • Release • Beta to UF, Sandia?, GWU?, NSA? • Maintenance and tuning • Optimizations • Single processor performance • Privatization • Communication overlap and pipelining • Software caching • Aggregation • IA64 backend? • Debugging?

  8. Future Plans (3) • Runtime • Shared memory implementation • I/O implementation • GASNet • Tuning and maintenance • Collectives • Strided and scatter/gather • X1 port • Infiniband port • Red Storm port ? • BlueGene/L port ?

  9. Future Plans (4) • Applications • SuperLU, starting with Sparse Cholesky • PetSc? • NAS-like AMR benchmark? • Astrophysics code from UCB/McMaster • Robert Thacker • Sandia (Zhaofang Wen) ? • 3D Mesh generation based on Pyramid ?

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