eigen/test/product_threaded.cpp

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2023 Rasmus Munk Larsen <rmlarsen@google.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#define EIGEN_GEMM_THREADPOOL
#include "main.h"

void test_parallelize_gemm() {
  constexpr int n = 1024;
  constexpr int num_threads = 4;
  MatrixXf a = MatrixXf::Random(n, n);
  MatrixXf b = MatrixXf::Random(n, n);
  MatrixXf c = MatrixXf::Random(n, n);
  c.noalias() = a * b;

  ThreadPool pool(num_threads);
  MatrixXf c_threaded(n, n);
  c_threaded.noalias() = a * b;

  VERIFY_IS_APPROX(c, c_threaded);
}

EIGEN_DECLARE_TEST(product_threaded) { CALL_SUBTEST(test_parallelize_gemm()); }