?? pingpong.java
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package microbenchmarkmpiJava.pingpong.Send; //// mpiJava version : Taboada// July 2002// DES//import java.io.*;import java.text.NumberFormat;import java.lang.Math;import mpi.*;public class PingPong { public static void main(String[] args) throws MPIException { } public PingPong() { } public PingPong(String[] args) throws Exception { double startwtime, endwtime; int i, iterations, size, ns, my_pe, npes, pot2size; Status status; long time; MPI.Init(args); my_pe = MPI.COMM_WORLD.Rank(); npes = MPI.COMM_WORLD.Size(); MPI.COMM_WORLD.Barrier(); iterations = Integer.parseInt(System.getProperty("ITERATIONS")); size = Integer.parseInt(System.getProperty("SIZE")); byte A[] = new byte [size]; for (i = 0; i < size; i++) { A[i] = (byte)'0'; //(double) 1. / (i + 1); } pot2size = (int)(Math.log((double) size)/1.386294361); if (pot2size < 0) pot2size = 0; MPI.COMM_WORLD.Barrier(); if (my_pe == 0) { for (ns = 0; ns < iterations; ns++) { MPI.COMM_WORLD.Barrier(); startwtime = MPI.Wtime(); MPI.COMM_WORLD.Send(A, 0, size, MPI.BYTE, 1, 10); status = MPI.COMM_WORLD.Recv(A, 0, size, MPI.BYTE, 1, 20); endwtime = MPI.Wtime(); //Format the Number to Display NumberFormat nf = NumberFormat.getInstance(); nf.setMaximumFractionDigits(6); nf.setMinimumFractionDigits(6); time = (long) (500000.*(endwtime - startwtime)); System.out.println(nf.format((double) time/1000000)+" \t "+time+" \t "+nf.format((double) size/time)+" \t "+size+" \t "+pot2size); } } if (my_pe == 1) { for (ns = 0; ns < iterations; ns++) { MPI.COMM_WORLD.Barrier(); status = MPI.COMM_WORLD.Recv(A, 0 , size, MPI.BYTE, 0, 10); MPI.COMM_WORLD.Send(A, 0, size, MPI.BYTE, 0, 20); } } MPI.Finalize(); if(my_pe == 0) { System.out.println(" Send PingPong TEST COMPLETE"); } }}?? 快捷鍵說明
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