Editing HPC High Processing Cluster in BITS PILANI (section)

== PREPERATION OF SLAVE NODE(IBM-40) ==
a. beowulf and wolf user were created as in master node 

b. Edit file /home/wolf/.bash_pofile 

 export LAMRSH='ssh -x' 
 ssh-agent 
 MPICH2=/home/wolf/mpich2-install/mpich2 
 PATH=$HOME/bin:$MPICH2/bin 

Make /linuxeda directory 

 mkdir /linuxeda 

This file have all the binaries and need to rsync with all when changes occurred.

 chmod 770 /linuxeda 

All home directories are in lvm mode name and location 

/staff :This Home directory is for 2 node IBM HPC.

/projects:This Home directory is for 2 node IBM HPC.

/ugassignments:This Home directory is for 9 node Sunfire HPC.

/pgassignments:This Home directory is for 9 node Sunfire HPC.

Following entry is made in /etc/exports file 

 /staff <nowiki>* (rw,no_root_squash,sync) </nowiki>
 /projects <nowiki>* (rw,no_root_squash,sync) </nowiki>
 /ugassignments<nowiki>* (rw,no_root_squash,sync) </nowiki>
 /pgassignments<nowiki>* (rw,no_root_squash,sync) </nowiki>
 <nowiki># service nfs start ; chkconfig nfs on</nowiki>

c. Reboot all the nodes. 

d. login as wolf users and install MPI as described above in MPI installation section above.

'''Note''': Firewall should be disabled in all nodes as MPI uses randoms ports each time it is started. 

 “mpdboot -n 2 -f mpd.hosts”  ** command should be executed as wolf user from master node. This will start mpd daemon in slave nodes **

Now we will run an MPI job, using the mpiexec command as specified in the MPI-2 standard.

As part of the build process for MPICH2, a simple program to compute the value of ''pi ''by numerical integration is created in the mpich2-1.2/examples directory. If the current directory is the top level MPICH2 build directory, then you can run this program with


 mpiexec -n 2 ./examples/cpi


The cpi example will tell you which hosts it is running on.