initial

CMakeLists.txt

@@ -3,4 +3,5 @@ project(threads)
 
 set(CMAKE_CXX_STANDARD 17)
 
-add_executable(threads main.cpp)
+add_executable(threads matrix_main.cpp
+        )

matrix_main.cpp

@@ -4,6 +4,8 @@
 #include <stdexcept>
 #include <chrono>
 #include <iostream>
+#include <omp.h>
+
 
 // Funktion erzeugt zwei Matrizen A und B der Größe n x n mit Zufallswerten
 void generateRandomMatrices(int n,
@@ -49,6 +51,27 @@ std::vector<std::vector<double>> matmul(const std::vector<std::vector<double>>&
     return C;
 }
 
+std::vector<std::vector<double>> matmul_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();
+
+    if (A[0].size() != B.size())
+        throw std::runtime_error("Matrixgrößen passen nicht.");
+
+    std::vector<std::vector<double>> C(n, std::vector<double>(m, 0.0));
+
+#pragma omp parallel for
+    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;
+}
+
 int main()
 {
     int N = 500; // z.B. 500x500
@@ -62,5 +85,11 @@ int main()
     std::chrono::duration<double> diff = end - start;
     std::cout << "Serial Took: " << diff.count() << "s\n";
 
+    start = std::chrono::steady_clock::now();
+    auto C_parallel= matmul_parallel(A, B);
+    end = std::chrono::steady_clock::now();
+    diff = end - start;
+    std::cout << "Serial Took: " << diff.count() << "s\n";
+
     return 0;
 }