Newsgroups: comp.parallel.mpi
From: impellus@ames.ucsd.edu (Tom Impelluso)
Subject: Very elemetary questions
Organization: UC San Diego, AMES Department
Date: 24 Apr 1995 17:24:44 GMT
Message-ID: <3ngmss$5fp@deadmin.ucsd.edu>


Hello world!

I have just 'made' mpi.  I made it on a sun4
which is connected to others on a local network here.

I issued the command "mpirun -np 4 cpi" and receieved some errors.
When I issued "mpirun -np 1 cpi", all was cool.

Now I am quite ignorant of how mpi communicates with the
other machines on the network.

So, some questions...

must I install mpi on each machine which I want to use?
Must I install it in the same place?
Aside from being sure the machine names are in /etc/hosts, how
 can I be sure there is communication?


As you can see, I am quite ignorant of networking.  MPI has now
presented me with a motivation for learning the network better.
However, I am in the midst of this dark wood, and am hoping someone
can point me in the right direction, and give me some elementary
starters.   Once I have that, I can begin hacking away at this
myself.   I have the documents I need, but they overlook the
very elementary platform from which I am starting. Essentially, I need
someone to help me locate the boundary between networking questions
and mpi questions so that I can look things up by myself ...  or,
at least phrase the questions better.

Could someone help me?

Thanks,
Tom

