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Author: mmalinova

LU1/Ex2/Program.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Ex2
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Enter the number of rows: ");
+            long rows = long.Parse(Console.ReadLine());
+
+            Console.WriteLine("Enter the number of cols: ");
+            long cols = long.Parse(Console.ReadLine());
+
+            long[,] firstMatrix = new long[rows, cols];
+            long[,] secondMatrix = new long[rows, cols];
+
+            firstMatrix = fillMatrix(rows, cols);
+            secondMatrix = fillMatrix(rows, cols);
+
+            var cores = Environment.ProcessorCount;
+
+            Stopwatch sw = new Stopwatch();
+
+            sw.Start();
+            multiplyMatrix(firstMatrix, rows, cols);
+            sw.Stop();
+            Console.WriteLine(sw.ElapsedMilliseconds);
+            sw.Reset();
+
+            sw.Start();
+            parallelmultiplyMatrix(firstMatrix, rows, cols);
+            sw.Stop();
+            Console.WriteLine(sw.ElapsedMilliseconds);
+
+            Console.WriteLine("Press enter to finish");
+            Console.ReadLine();
+        }
+
+        private static void parallelmultiplyMatrix(long[,] firstMatrix, long rows, long cols)
+        {
+            Parallel.For(0, rows, (row) =>
+            {
+                Parallel.For(0, cols, (col) =>
+                {
+                    firstMatrix[row, col] *= 99;
+                });
+            });
+        }
+
+        private static void multiplyMatrix(long[,] firstMatrix, long rows, long cols)
+        {
+            for (int row = 0; row < rows; row++)
+            {
+                for (int col = 0; col < cols; col++)
+                {
+                    firstMatrix[row, col] *= 99;
+                }
+            }
+        }
+
+        private static void parallelmultiplyTwoMatrices(long[,] firstMatrix, long[,] secondMatrix, long rows, long cols)
+        {
+            long[,] matrix = new long[rows, cols];
+
+            Parallel.For(0, rows, i => {
+                Parallel.For(0, cols, j => {
+                    matrix[i, j] = 0;
+                    Parallel.For(0, cols, k => {
+                        matrix[i, j] += firstMatrix[i, k] * secondMatrix[k, j];
+                    });
+                });
+            });
+        }
+
+        private static void multiplyTwoMatrices(long[,] firstMatrix, long[,] secondMatrix, long rows, long cols)
+        {
+            long[,] matrix = new long[rows, cols];
+
+            for (int i = 0; i < rows; i++)
+            {
+                for (int j = 0; j < cols; j++)
+                {
+                    matrix[i, j] = 0;
+                    for (int k = 0; k < cols; k++)
+                    {
+                        matrix[i, j] += firstMatrix[i, k] * secondMatrix[k, j];
+                    }
+                }
+            }
+        }
+
+        private static long[,] fillMatrix(long rows, long cols)
+        {
+            long[,] matrix = new long[rows, cols];
+
+            for (int row = 0; row < rows; row++)
+            {
+                for (int col = 0; col < cols; col++)
+                {
+                    matrix[row, col] = row * col;
+                }
+            }
+            return matrix;
+        }
+    }
+}