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Thread: Task in java with Threads

  1. #1
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    Default Task in java with Threads

    Hi guys, I have two tasks, when I run the code normally and sequentially, the runtime is faster than 2 Threads which are handling my 2 tasks, why is happening this?, My Teacher told me that Dividing my tasks in Threads my code will run Faster than without 'em, But that is not Happing....Why??? Maybe the processor power is divided by two? Sorry About My English, I'm using translator... Bye


  2. #2
    Member angstrem's Avatar
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    Default Re: Task in java with Threads

    Post here your code please. Maybe, there's some error, so we need to see.

  3. #3
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    Default Re: Task in java with Threads

    package multi_matrices_hilos;
     
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
     
     
    public class Multi_MAtrices_Hilos {    
     
        public static void main(String[] args) {
            GestorTareas gt = new GestorTareas();
            try{
                gt.Ciclo_Principal();
     
            }catch(Exception E){}
        }    
    }
     
    class GestorTareas {
        private Menu menu;
        private Multiplicar_Matriz datos;
     
        public GestorTareas(){
            menu = new Menu();
            datos  = new Multiplicar_Matriz(4000,4000,4000);
            menu = new Menu();
     
        }
     
        public void Ciclo_Principal() throws InterruptedException  
        {
     
            new Thread(datos).start();
            Thread.sleep(1);
            datos.set_numSubProceso((byte)1);        
            new Thread(datos).start();
            //datos.set_numSubProceso((byte)3);
     
            //datos.GenerarMatrizA();
            //datos.GenerarMatrizB();
     
            int op;
            try{
                op = menu.menu();
                gestor_opciones(op);
     
            }catch(Exception e){
                System.out.print("Error" + e.getMessage());
               // throw e;
            }
        }
        private void gestor_opciones(int op) throws IOException
        {
            switch(op)
            {
                case 1:
                    menu.datos_M_N_S();                
                    break;
                case 4:
                    break;
            }
        }    
    }
     
    class Menu 
    {
        private BufferedReader br;
     
        public Menu()
        {
            br = new BufferedReader( new InputStreamReader(System.in));
        }
        public int menu() throws IOException
        {
            System.out.println("1.Cargar Nuevos Matrices Datos.");
            System.out.println("2.Mostrar Matriz A.");
            System.out.println("3.Mostrar Matriz B.");
            System.out.println("4.Iniciar.");
            System.out.println("5.Salir.");
     
            return Integer.parseInt(br.readLine());
        }
        public int[] datos_M_N_S() throws IOException
        {
            int[] MNS = new int[3];
            System.out.print("\nInsertar M: ");
            Integer.parseInt(br.readLine());        
            System.out.print("\nInsertar N: ");
            Integer.parseInt(br.readLine());
            System.out.println("\nInsertar S: ");
            Integer.parseInt(br.readLine());
     
            return MNS;
        }
    }
     
     
    class Multiplicar_Matriz implements Runnable
    {
     
        @Override
        public void run() {
            switch(numSubProceso)
            {
                case 0:   
                    GenerarMatrizA();
                    break;
                case 1:   
                    GenerarMatrizB();
                    break;
                case 2:   
                    break;
            }        
     
        }
        public Multiplicar_Matriz()
        {
           numSubProceso = 0;
        }
        public Multiplicar_Matriz(int M,int N,int S)
        {
            this();
            this.M = M;this.N = N;this.S = S;
            MatrizA  = new int[M][N];
            MatrizB  = new int[N][S];
            Matriz_C = new int[M][S];        
        }
     
        public void GenerarMatrizA()
        {
            long tiempoInicio = System.currentTimeMillis();
            for(int i=0;i<M;i++)for(int j=0;j<N;j++) 
                MatrizA[i][j] = (int) Math.floor(Math.random()*(101));
     
            long totalTiempo = System.currentTimeMillis() - tiempoInicio;
     
            System.out.println("El Tiempo en generar la MatrizA es: "+totalTiempo);
        }
     
        public void GenerarMatrizB()
        {
            long tiempoInicio = System.currentTimeMillis();
            for(int i=0;i<N;i++)for(int j=0;j<S;j++) 
                MatrizB[i][j] = (int) Math.floor(Math.random()*(101));
     
            long totalTiempo = System.currentTimeMillis() - tiempoInicio;
     
            System.out.println("El Tiempo en generar la MatrizB es: "+totalTiempo);
        }
     
        public void multiplicarMatrices_A_B()
        {
            for (int k = 0; k < M; k++)for( int j = 0; j < S; j++)for(int i = 0; i < N; i++ )             
               Matriz_C[k][j] += MatrizA[k][i] * MatrizB[i][j];
        }
     
        public void mostrarMatricesC()
        {
            for(int i = 0; i < M; i++ ){for(int j = 0; j < S; j++)System.out.print(Matriz_C[i][j]+" ");
               System.out.println();
            }
        }
     
        public void set_numSubProceso(byte numSubProceso)
        {
            this.numSubProceso = numSubProceso;
        }
     
        private int M,N,S;
        private static int[][] Matriz_C;
        private int[][] MatrizA;
        private int[][] MatrizB;
        private byte numSubProceso;    
    }

  4. #4
    Member angstrem's Avatar
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    Default Re: Task in java with Threads

    How do you measure time? I can't see corresponding idioms in your code.

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