Now, it is time to test your installation. First you can have a look on the ganglia monitor. Open your browser on http://localhost/ganglia/, and you should see something like:

Figure 21.1. Ganglia web page monitor

Ganglia gstat command should work too:

[iggi@iggi ~]$ gstat -al
iggi.guibland.com
    2 (    0/  141) [  0.23,  0.26,  0.18] [   0.4,   0.0,   0.1,  99.3,   0.3] OFF
node3.guibland.com
    1 (    0/   56) [  0.02,  0.08,  0.09] [   5.3,   0.0,   0.3,  94.3,   0.0] OFF
node1.guibland.com
    1 (    0/   56) [  0.05,  0.10,  0.13] [   5.1,   0.0,   0.3,  94.6,   0.0] OFF
node2.guibland.com
    1 (    0/   56) [  0.08,  0.11,  0.09] [   5.1,   0.0,   0.3,  94.6,   0.0] OFF

You should take a look in Chapter 13, Administration of IGGI Nodes chapter.

[iggi@iggi ~]$ rshp2 $NKA -- id
uid=12385(iggi) gid=100(users) groups=100(users),500(oar),12385(pvm)
uid=12385(iggi) gid=100(users) groups=100(users),500(oar),12385(pvm)
uid=12385(iggi) gid=100(users) groups=100(users),500(oar),12385(pvm)

Add a user in your cluster using the Section 13.10, “adduserNis.pl and deluserNis.pl” command. Login as this new user and copy the test_mpi.mpich script from /usr/share/doc/mpich/ to your home dir.

This example runs the test_mpi.mpich script using 4 nodes. If your cluster is ready to run, you should see a "Hello World" message for each node you have. Run the mpirun command as follows:

Running mpich version "Hello world"

[iggi@iggi ~]$ cp -v /usr/share/doc/mpich-1.2.5.2/test_mpi.mpich ~/
`/usr/share/doc/mpich-1.2.5.2/test_mpi.mpich' -> `/home/nis/iggi/test_mpi.mpich'

[iggi@iggi ~]$ mpirun -np 5 ./test_mpi.mpich
iggi.guibland.com: Sending Hello World!

  |- node3.guibland.com             Hello World!
  |- node2.guibland.com             Hello World!
  |- node1.guibland.com             Hello World!
  |- node1.guibland.com             Hello World!

Add a user in your cluster using the Section 13.10, “adduserNis.pl and deluserNis.pl” command. Login as this new user and copy the test_mpi.lam script from /usr/bin to your home directory.

Start LAM using the "lamboot" command. No error messages should appear.

This example runs the test_mpi.lam script using 4 nodes. If your cluster is ready to run, you should see a "Hello World" message for each node you have. Run the mpirun-lam command as follows:

Running lam version "Hello world"

[iggi@iggi ~]$ cp -v /usr/bin/test_mpi.lam ~/
`/usr/bin/test_mpi.lam' -> `/home/nis/iggi/test_mpi.lam'
[iggi@iggi ~]$ lamboot

LAM 7.1.2/MPI 2 C++/ROMIO - Indiana University

[iggi@iggi ~]$ mpirun-lam -np 4 ./test_mpi.lam
node1.guibland.com: Sending Hello World!

  |- iggi.guibland.com              Hello World!
  |- node2.guibland.com             Hello World!
  |- node3.guibland.com             Hello World!