?? bcast_bench.java
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package mpi.perf; import mpi.*;class bcast_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, endTime; for(j=0;j<WARM_UP;j++) { MPI.COMM_WORLD.Bcast(out,0,1024,MPI.BYTE,root); } //startTime = MPI.Wtime(); for(j=0;j<REPEAT ;j++) { MPI.COMM_WORLD.Bcast(out,0,1024,MPI.BYTE,root); } //endTime = MPI.Wtime(); if(myself == tasks-1) {// System.out.println(tasks+" "+// ((endTime - startTime)/(1000*REPEAT)) ); } MPI.COMM_WORLD.Barrier(); MPI.Finalize(); }}?? 快捷鍵說明
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