package mpi.perf; import mpi.*;class barrier_bench {  static public void main(String[] args) throws MPIException {    final int MAXLEN = 1024;    int root,i,j=MAXLEN,k;    //byte out[] = new byte[MAXLEN];    int REPEAT  = 1000;    int WARM_UP = 10;    int myself,tasks;    double time;/*    for(i=0;i<j;i++) {        out[i] = 's' ; //(byte)i+j;    }*/        MPI.Init(args);    myself = MPI.COMM_WORLD.Rank();     tasks = MPI.COMM_WORLD.Size();            root = 0;    long startTime=0l, endTime=0l;        for(j=0;j<WARM_UP;j++)  {                 MPI.COMM_WORLD.Barrier();    }        //startTime = MPI.Wtime();        for(j=0;j<REPEAT ;j++)  {                 MPI.COMM_WORLD.Barrier();    }    //endTime = MPI.Wtime();    if(myself == tasks-1) { //   System.out.println(tasks+"     "+//		    ((endTime - startTime)/(1000*REPEAT)) );    }    MPI.COMM_WORLD.Barrier();    MPI.Finalize();     }}