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60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
// Benchmarks for symmetric rank-1 update (SYR).
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//
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// Tests C.selfadjointView<Lower>().rankUpdate(v, alpha) which computes
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// C += alpha * v * v^T, updating only the lower (or upper) triangle.
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// Exercises SelfadjointProduct.h / selfadjoint_rank1_update.
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#include <benchmark/benchmark.h>
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#include <Eigen/Core>
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using namespace Eigen;
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template <typename Scalar>
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double syrFlops(Index n) {
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// SYR: n*(n+1)/2 multiply-adds ~ n^2
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return (NumTraits<Scalar>::IsComplex ? 8.0 : 2.0) * n * (n + 1) / 2;
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}
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template <typename Scalar>
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static void BM_SYR_Lower(benchmark::State& state) {
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const Index n = state.range(0);
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using Mat = Matrix<Scalar, Dynamic, Dynamic>;
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using Vec = Matrix<Scalar, Dynamic, 1>;
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Vec v = Vec::Random(n);
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Mat C = Mat::Zero(n, n);
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Scalar alpha(1);
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for (auto _ : state) {
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C.template selfadjointView<Lower>().rankUpdate(v, alpha);
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benchmark::DoNotOptimize(C.data());
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benchmark::ClobberMemory();
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}
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state.counters["GFLOPS"] = benchmark::Counter(syrFlops<Scalar>(n), benchmark::Counter::kIsIterationInvariantRate,
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benchmark::Counter::kIs1000);
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}
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template <typename Scalar>
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static void BM_SYR_Upper(benchmark::State& state) {
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const Index n = state.range(0);
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using Mat = Matrix<Scalar, Dynamic, Dynamic>;
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using Vec = Matrix<Scalar, Dynamic, 1>;
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Vec v = Vec::Random(n);
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Mat C = Mat::Zero(n, n);
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Scalar alpha(1);
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for (auto _ : state) {
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C.template selfadjointView<Upper>().rankUpdate(v, alpha);
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benchmark::DoNotOptimize(C.data());
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benchmark::ClobberMemory();
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}
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state.counters["GFLOPS"] = benchmark::Counter(syrFlops<Scalar>(n), benchmark::Counter::kIsIterationInvariantRate,
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benchmark::Counter::kIs1000);
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}
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static void SyrSizes(::benchmark::Benchmark* b) {
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for (int n : {8, 16, 32, 64, 128, 256, 512, 1024, 2048}) b->Arg(n);
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}
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BENCHMARK(BM_SYR_Lower<float>)->Apply(SyrSizes)->Name("SYR_Lower_float");
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BENCHMARK(BM_SYR_Lower<double>)->Apply(SyrSizes)->Name("SYR_Lower_double");
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BENCHMARK(BM_SYR_Upper<float>)->Apply(SyrSizes)->Name("SYR_Upper_float");
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BENCHMARK(BM_SYR_Upper<double>)->Apply(SyrSizes)->Name("SYR_Upper_double");
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