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Subject: Re: [OMPI users] mpirun tries to ssh to local machine
From: Reuti (reuti_at_[hidden])
Date: 2013-08-26 06:37:24


Am 26.08.2013 um 12:15 schrieb Federico Carotenuto:

> I'm currently having this issue with mpirun: I want to launch a program only on the cores of the local machine, but every time I run an mpi program it says that the host 127.0.0.1 <local_machine_name> with it's associated key is unkown and asks me if I want to add it to the list of ssh known hosts.
>
> By chowing/chmodding the .ssh file I was able to permanently add this "host" to the list of known hosts, but my problem is that every program that I try to run ask me to insert a password (the actual local user password) n times where n is equal to the -np parameter (i.e.: if I run the program on 8 cores I receive 8 successive password pronts).
>
> If I insert the password everything runs fine, but it's quite annoying and I wish to bypass such step: is there a way to have mpirun memorize the password? Or make him understand that the 8 nodes are actually 8 cores on the local machine and not 8 different hosts?

Which hostname do you specify in your machinefile?
Which hostnames are set in /etc/hosts for your local machine?
What is the output of `hostname`? Does it match the one in the machinefile?

For systemd there is a new command `hostnamectl --static set-hostname [NAME]` to set it.

-- Reuti