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Hi!<br>
<br>
I am new with MPI. <br>
First I tried an MPI program in a multicore Linux computer, and it
worked OK. <br>
My current step is to try to run the same program in a "cluster"
composed by two multicore Linux computers, when my final goal is to
have a cluster composed by 16 computers (actually, a 64-cores
cluster). <br>
I learned that in order to run such a program I need to prevent ssh
password requirement when nodes send and/or receive messages among
each other. I found the "How to set up SSH Keys" tutorial and setup
the two-computer "cluster" according to what is explained in the
tutorial. <br>
<br>
The result of the 4-steps tutorial procedure is as follows: <br>
<br>
the .ssh directory of the first computer has the following files:
id_rsa, id_rsa.sub, and known_hosts<br>
the .ssh directory of the second computer has the following files:
authorized_keys, and known_hosts<br>
If I do by-hand ssh from the first computer to the second, the
second computer does not require password. <br>
If I do by-hand ssh from the second computer to the first, the first
computer requires password. <br>
<br>
Because of this, I guess, when I run the MPI program, it gets stuck
when an ssh connection is tried between the second computer to the
first one. Right? <br>
<br>
Thus, I request your help to correctly setup password-less ssh
capability in the first computer, in order to allow password-less
ssh among all the nodes in the cluster (currently, among only two
computers). Actually, the question is how I allow password-less ssh
connection to the first computer. <br>
<br>
I thank you all of you in advance for your help. <br>
Sincerely, <br>
-- Moshe Goldstein <br>
<br>
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