Attachment 847 Details for Bug 1494 – mini benchmark for pmin

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mini benchmark for pmin

perf_minmax.cpp (text/x-csrc), 1.03 KB, created by Gael Guennebaud on 2018-04-04 21:12:09 UTC

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Creator: Gael Guennebaud

Created: 2018-04-04 21:12:09 UTC

Size: 1.03 KB

patch

obsolete

>#include <iostream>
>#include <Eigen/Dense>
>#include <bench/BenchTimer.h>
>using namespace Eigen;
>using namespace std;
>
>template<typename T>
>EIGEN_DONT_INLINE
>void coeffwise(const T &a, const T &b, T& c)
>{
>  c = a.min(b);
>}
>
>template<typename T>
>EIGEN_DONT_INLINE
>typename T::Scalar redux(const T &a)
>{
>  return a.minCoeff();
>}
>
>int main()
>{
>  int tries = 10000;
>  int rep = 100;
>  int n = 1000;
>  ArrayXf a(n), b(n), c(n);
>  a.setRandom();
>  b.setRandom();
>  c.setRandom();
>  BenchTimer t;
>  BENCH(t, tries, rep, coeffwise(a, b, c));
>  std::cout << "coeffwise: " << t.best() << "s  | " << c.sum() << std::endl;
>
>  BENCH(t, tries, rep, b[0]+=redux(a));
>  std::cout << "redux: " << t.best() << "s  | " << b[0] << std::endl;
>}
>
>
>/*
>
>// POWER7
>
>// vec_min
>coeffwise: 2.6218e-05s  | -318.279
>redux: 2.2514e-05s  | -999804
>
>// asm
>coeffwise: 2.9966e-05s  | -318.279
>redux: 4.3434e-05s  | -999804
>
>
>// POWER 8
>
>// vec_min
>coeffwise: 2.2198e-05s  | -318.279
>redux: 1.5742e-05s  | -999804
>
>// asm
>coeffwise: 2.8444e-05s  | -318.279
>redux: 2.3142e-05s  | -999804
>
>*/

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Attachments on bug 1494: 831 | 846 | 847