generated from freudenreichan/Programmieren_3b
95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
#include <vector>
|
|
#include <chrono>
|
|
#include <iostream>
|
|
#include <omp.h>
|
|
#include <cstdlib>
|
|
#include <ctime>
|
|
|
|
// Zufallsmatrizen erzeugen
|
|
void generateRandomMatrices(int n,
|
|
std::vector<std::vector<double>>& A,
|
|
std::vector<std::vector<double>>& B)
|
|
{
|
|
std::srand(static_cast<unsigned int>(std::time(nullptr)));
|
|
A.resize(n, std::vector<double>(n));
|
|
B.resize(n, std::vector<double>(n));
|
|
|
|
for (int i = 0; i < n; ++i)
|
|
for (int j = 0; j < n; ++j)
|
|
{
|
|
A[i][j] = static_cast<double>(rand()) / RAND_MAX * 10.0;
|
|
B[i][j] = static_cast<double>(rand()) / RAND_MAX * 10.0;
|
|
}
|
|
}
|
|
|
|
// Serielle Matrizenmultiplikation
|
|
std::vector<std::vector<double>> matmul_serial(
|
|
const std::vector<std::vector<double>>& A,
|
|
const std::vector<std::vector<double>>& B)
|
|
{
|
|
int n = A.size();
|
|
int m = B[0].size();
|
|
int p = B.size();
|
|
std::vector<std::vector<double>> C(n, std::vector<double>(m, 0.0));
|
|
|
|
for (int i = 0; i < n; ++i)
|
|
for (int j = 0; j < m; ++j)
|
|
for (int k = 0; k < p; ++k)
|
|
C[i][j] += A[i][k] * B[k][j];
|
|
|
|
return C;
|
|
}
|
|
|
|
// Parallele Zeilenzerlegung
|
|
std::vector<std::vector<double>> matmul_row_parallel(
|
|
const std::vector<std::vector<double>>& A,
|
|
const std::vector<std::vector<double>>& B)
|
|
{
|
|
int n = A.size();
|
|
int m = B[0].size();
|
|
int p = B.size();
|
|
std::vector<std::vector<double>> C(n, std::vector<double>(m, 0.0));
|
|
|
|
#pragma omp parallel for
|
|
for (int i = 0; i < n; ++i) // Zeilen parallel
|
|
for (int j = 0; j < m; ++j)
|
|
for (int k = 0; k < p; ++k)
|
|
C[i][j] += A[i][k] * B[k][j];
|
|
|
|
return C;
|
|
}
|
|
|
|
// -----------------------------
|
|
int main()
|
|
{
|
|
int N = 500;
|
|
std::vector<std::vector<double>> A, B;
|
|
generateRandomMatrices(N, A, B);
|
|
|
|
// Serielle Version
|
|
auto start = std::chrono::steady_clock::now();
|
|
auto C_serial = matmul_serial(A, B);
|
|
auto end = std::chrono::steady_clock::now();
|
|
std::cout << "Serial multiplication took: "
|
|
<< std::chrono::duration<double>(end - start).count() << "s\n";
|
|
|
|
// Zeilenparallel
|
|
start = std::chrono::steady_clock::now();
|
|
auto C_row = matmul_row_parallel(A, B);
|
|
end = std::chrono::steady_clock::now();
|
|
std::cout << "Row-parallel multiplication took: "
|
|
<< std::chrono::duration<double>(end - start).count() << "s\n";
|
|
|
|
// Vergleich
|
|
for (int i = 0; i < N; ++i)
|
|
for (int j = 0; j < N; ++j)
|
|
if (C_serial[i][j] != C_row[i][j])
|
|
{
|
|
std::cout << "Mismatch at " << i << "," << j << "\n";
|
|
return 1;
|
|
}
|
|
|
|
std::cout << "All results match!\n";
|
|
return 0;
|
|
}
|