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An Efficient Profile-Analysis Framework for Data-Layout Optimizations

An Efficient Profile-Analysis Framework for Data-Layout Optimizations. By Shai Rubin, Rastislav Bodik, Trishul Chilimbi. Data-Layout Optimization. To improve memory hierarchy performance by exploiting spatial locality Group the data that is accessed together Minimizing cache conflicts

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An Efficient Profile-Analysis Framework for Data-Layout Optimizations

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  1. An Efficient Profile-Analysis Framework for Data-Layout Optimizations By Shai Rubin, Rastislav Bodik, Trishul Chilimbi

  2. Data-Layout Optimization • To improve memory hierarchy performance by exploiting spatial locality • Group the data that is accessed together • Minimizing cache conflicts • Optimizations • Field rearrangement in an object • Object rearrangement in the heap • Object inlining

  3. Motivation • A solution to find the optimal layout is NP-hard and also poorly approximable • All these techniques are actually heuristics and no guarantee of effectiveness and robustness • A naïve approach is tedious

  4. Solution • A generalized framework to determine the best layout for a given program • Unifying existing profile-based data layout optimizations • A very efficient way of evaluating a candidate layout with simulation

  5. Optimization Evaluation • Memoization • Dynamic programming • Whole Program Misses • The representation omits references that can never suffer any memory fault • Ex. abba • On demand Cache simulation

  6. Results

  7. Discussion • How many applications really use this kind of optimizations? • Some of the optimizations are already automated (ex. Object inlining)

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