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Subject: Re: [OMPI users] mpirun tries to ssh to local machine
From: Federico Carotenuto (carotenuto_at_[hidden])
Date: 2013-08-26 06:53:00


Kind Reuti,

Thanks for your quick reply!

I'm afraid I didn't set a machinefile...that may be the problem: I'm
fairly new to MPI and SSH and I'm still quite confused even after
reading some tutorials.

My etc/hosts contains: 127.0.0.1 localhost and 127.0.1.1 modelstation
(modelstation is the machine name I was mentioning in the previous mail)

if I type hostname the terminal returns modelstation

Cheers

Reuti <reuti_at_[hidden]> ha scritto:

> 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
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>

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