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Subject: Re: [OMPI users] mpirun tries to ssh to local machine
From: Reuti (reuti_at_[hidden])
Date: 2013-08-26 08:17:56


Am 26.08.2013 um 12:53 schrieb Federico Carotenuto:

> 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.

There is a default. But you can also specify it on the command line to test it:

mpiexec -host modelstation -np 2 mpihello

-- Reuti

> 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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>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>
>
>
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