![]() ![]() Incorporates same FFT and cache padding.Reimplementation of Berkeley UPC non-blocking.Add Column pad optimization (up to 4X speedup on.Messages with FT-Pencils and 1024 messages with At Class D/256 Threads, each thread sends 4096.Aggressive use of non-blocking messages.Converted from OpenMP, data structures and.Overlapping communication and computation.NAS FT Decomposing communication to reduce.One-sided communication on Clusters (Firehose).Unified Parallel C (UPC effort at LBNL/UCB).However, pencils recover more time in allowingįor cache-friendly alignment and smaller memory.In Communication time, pencils are on average.In MFlops, pencils (lt16Kb messages) are 10.Non-blocking version requires about 30 extra.Produce 15-45 speedup over best UPC Blocking.Berkeley UPC compiler support non-blocking UPC.Example Message Size Breakdown for Class D at 256.Do column FFTs, then row FFTs on first row, sendĭecomposing NAS FT Exchange into Smaller Messages.When done with xy, wait for and start on z.Do column FFTs, then row FFT on first slab, then.Do column/row FFTs, then send 1/pth of data to.Several implementations, each processor owns a.Separate computation and communication phases.Single Communication Operation (Global Exchange).Spread communication out over longer period of Use a better network (higher Bisection BW) Between 30-40 of the applications total runtime.Becoming more expensive as processors grows.Determined by available bisection bandwidth.Performance of Exchange (All-to-all) is critical.Avoid unnecessary delays due to dependencies.Generate friendly code or use tuned libraries.One way to gain acceptance of a new language.UPC Benchmarks Kathy Yelick LBNL and UC BerkeleyĬhristian Bell, Dan Bonachea, Wei Chen, Jasonĭuell, Paul Hargrove, Parry Husbands, Costin Title: Ernest Orlando Lawrence Berkeley National Laboratory ![]()
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