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143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
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// g++ -DNDEBUG -O3 -I.. benchLLT.cpp -o benchLLT && ./benchLLT
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// options:
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// -DBENCH_GSL -lgsl /usr/lib/libcblas.so.3
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// -DEIGEN_DONT_VECTORIZE
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// -msse2
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// -DREPEAT=100
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// -DTRIES=10
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// -DSCALAR=double
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#include <iostream>
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#include <Eigen/Core>
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#include <Eigen/Cholesky>
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#include <bench/BenchUtil.h>
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using namespace Eigen;
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#ifndef REPEAT
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#define REPEAT 10000
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#endif
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#ifndef TRIES
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#define TRIES 10
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#endif
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typedef float Scalar;
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template <typename MatrixType>
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__attribute__ ((noinline)) void benchLLT(const MatrixType& m)
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{
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int rows = m.rows();
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int cols = m.cols();
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double cost = 0;
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for (int j=0; j<rows; ++j)
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{
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int r = std::max(rows - j -1,0);
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cost += 2*(r*j+r+j);
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}
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int repeats = (REPEAT*1000)/(rows*rows);
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typedef typename MatrixType::Scalar Scalar;
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typedef Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime> SquareMatrixType;
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MatrixType a = MatrixType::Random(rows,cols);
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SquareMatrixType covMat = a * a.adjoint();
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BenchTimer timerNoSqrt, timerSqrt;
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Scalar acc = 0;
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int r = internal::random<int>(0,covMat.rows()-1);
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int c = internal::random<int>(0,covMat.cols()-1);
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for (int t=0; t<TRIES; ++t)
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{
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timerNoSqrt.start();
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for (int k=0; k<repeats; ++k)
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{
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LDLT<SquareMatrixType> cholnosqrt(covMat);
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acc += cholnosqrt.matrixL().coeff(r,c);
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}
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timerNoSqrt.stop();
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}
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for (int t=0; t<TRIES; ++t)
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{
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timerSqrt.start();
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for (int k=0; k<repeats; ++k)
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{
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LLT<SquareMatrixType> chol(covMat);
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acc += chol.matrixL().coeff(r,c);
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}
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timerSqrt.stop();
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}
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if (MatrixType::RowsAtCompileTime==Dynamic)
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std::cout << "dyn ";
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else
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std::cout << "fixed ";
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std::cout << covMat.rows() << " \t"
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<< (timerNoSqrt.best()) / repeats << "s "
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<< "(" << 1e-9 * cost*repeats/timerNoSqrt.best() << " GFLOPS)\t"
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<< (timerSqrt.best()) / repeats << "s "
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<< "(" << 1e-9 * cost*repeats/timerSqrt.best() << " GFLOPS)\n";
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#ifdef BENCH_GSL
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if (MatrixType::RowsAtCompileTime==Dynamic)
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{
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timerSqrt.reset();
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gsl_matrix* gslCovMat = gsl_matrix_alloc(covMat.rows(),covMat.cols());
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gsl_matrix* gslCopy = gsl_matrix_alloc(covMat.rows(),covMat.cols());
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eiToGsl(covMat, &gslCovMat);
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for (int t=0; t<TRIES; ++t)
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{
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timerSqrt.start();
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for (int k=0; k<repeats; ++k)
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{
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gsl_matrix_memcpy(gslCopy,gslCovMat);
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gsl_linalg_cholesky_decomp(gslCopy);
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acc += gsl_matrix_get(gslCopy,r,c);
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}
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timerSqrt.stop();
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}
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std::cout << " | \t"
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<< timerSqrt.value() * REPEAT / repeats << "s";
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gsl_matrix_free(gslCovMat);
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}
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#endif
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std::cout << "\n";
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// make sure the compiler does not optimize too much
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if (acc==123)
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std::cout << acc;
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}
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int main(int argc, char* argv[])
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{
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const int dynsizes[] = {4,6,8,16,24,32,49,64,128,256,512,900,1500,0};
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std::cout << "size LDLT LLT";
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// #ifdef BENCH_GSL
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// std::cout << " GSL (standard + double + ATLAS) ";
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// #endif
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std::cout << "\n";
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for (int i=0; dynsizes[i]>0; ++i)
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benchLLT(Matrix<Scalar,Dynamic,Dynamic>(dynsizes[i],dynsizes[i]));
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benchLLT(Matrix<Scalar,2,2>());
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benchLLT(Matrix<Scalar,3,3>());
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benchLLT(Matrix<Scalar,4,4>());
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benchLLT(Matrix<Scalar,5,5>());
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benchLLT(Matrix<Scalar,6,6>());
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benchLLT(Matrix<Scalar,7,7>());
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benchLLT(Matrix<Scalar,8,8>());
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benchLLT(Matrix<Scalar,12,12>());
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benchLLT(Matrix<Scalar,16,16>());
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return 0;
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}
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