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Workshop on Advanced Computing for Accelerators Day 3

Workshop on Advanced Computing for Accelerators Day 3. Roger Barlow. Computers get faster. Moore’s Law. Livingston Plot. So?. Most of us spend most of our time with computers We can do calculations more quickly We can do different calculations We can use calculations in a different way

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Workshop on Advanced Computing for Accelerators Day 3

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  1. Workshop on Advanced Computing for AcceleratorsDay 3 Roger Barlow

  2. Computers get faster Moore’s Law Livingston Plot

  3. So? Most of us spend most of our time with computers • We can do calculations more quickly • We can do different calculations • We can use calculations in a different way • These can change our whole approach to the way we plan and work Provided we are prepared to learn to use new tools, not just stick with familiar desktops and laptops.

  4. Different Problems Different ‘Parallel’ Architectures Many Cores Not connected (Condor) Many Cores On 1 chip (MIC) Many Cores linked (Beowulf) Many specially configured Cores (GPU) Independentidentical particles/cells Dependent steps Connected particles/cells Independentdifferent particles/cells Need to match…

  5. Day 1: What we can do now Existing packages GENESIS and VSIM (formerly VORPAL) implemented on Hartree HPC cluster (Also GPT available: ELEGANT available soon) Thanks to David, Jonny, Bas and Peter, and to support from Rob and other Hartree centre people. First use of training centre. ~45 people have now used HPC Graph shows speed up I obtained on GENESIS job from using many cores Impressive to get 2400 CPU sec job back in < 1 minute

  6. Day 2: Learning from others Very broad range of talks. My personal impressions… • Cores are there, and begging to be exploited • Writing new code is more successful than parallelising old code • Gains to be made at low level (linear algebra) • GPUs are very specific. Hard to adapt to our purposes • Multicore node architecture (Xeon Phi) looks very nice • Condor Pools are unconvincing • openMP /multicore beats MPI/message passing • Genetic optimisation/Pareto fronts are becoming standard But specific purposes need specific tools - Condor, GPUs, rewrites may be the right answer to some questions

  7. Day 3: Making things happen Most important day… Personal plans for the way our work is going to go in future Collaborations/projects forming between people here Proposals for funding to EPSRC, STFC, etc

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