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package mpi.comm;
import mpi.*;
import java.util.Arrays;
/*
* things i have done today,
* 1. Intracomm class, createGroup method. Intracomm constructor.
* created this comm_test class
* 2. was trying to make this stupid collective
* operations work. as their
* and the backup should be 20th Jan and get aamirmpj,
* the whole code now ....
*/
public class comm_test {
/* this test runs with eight processors at the moment. */
public static void main(String args[]) throws Exception {
try {
comm_test a = new comm_test(args);
}
catch (Exception e) {
}
}
public comm_test() {
}
public comm_test(String[] args) throws Exception {
MPI.Init(args);
Group grp1 = MPI.COMM_WORLD.Group();
Comm myComm;
int[] incl1 = { 0, 2, 4, 6 };
int rank = MPI.COMM_WORLD.Rank();
int size = MPI.COMM_WORLD.Size();
if (size < 8) {
if (rank == 0)
System.out.println("comm->comm_test: RUNS WITH 8 processes atleast");
MPI.COMM_WORLD.Barrier();
MPI.Finalize();
return;
}
Group grp2 = grp1.Incl(incl1);
// System.out.println("world<"+rank+">,newComm<"+grp2.Rank()+">");
/*
* i've to write this if statement because group methods return null at the
* moment, which results in nullpointer exception. this has to be fixed by
* returning EMPTY and other relevant flags
*/
// if( rank== 0 || rank==2|| rank==4 || rank==6 ) {
// System.out.println("rank "+rank+" is within");
myComm = MPI.COMM_WORLD.Create(grp2);
// }
// if(myComm == null){
// System.out.println("rank "+rank+" myComm rank = "+myComm.Rank());
// }
MPI.COMM_WORLD.Barrier();
if (rank == 0)
System.out.println("comm_test TEST COMPLETE");
MPI.Finalize();
}
}
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