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I am trying to set up a distributed computing cluser via MPI (MPICH2), running on Windows XP. I am trying to run a single command, along the lines of

>> mpiexec -hosts 2 localhost 1 other-computer 2 notepad.exe
Aborting: unable to connect to other-computer

What are possible causes? I know that the network is fine, since ping works: 

>> ping other-computer
Pinging other-computer [IPADDRESS] ...
Reply from IPADDRESS: bytes=32 time<1ms TTL=128
...

mpiexec.exe and smtpd.exe are both listed as exceptions in Windows Firewall.

What could be possible causes of this problem? My Google-fu has failed me! (Could it be something to do with authentication? I tried using -logon, but that doesn't change anything. If it might be an authentication problem, how can I find my own username / password (or does it use the computer username/password)?)

Please forgive ignorance, as I am unfamiliar with the workings of MPI.

Wesley Bland
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user1592869
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  • Do you mean `smpd.exe` or `mpd.exe`? A process named `smtpd.exe` would be a mail server. Do you have the launcher daemon running on `other-computer`? You can check the task manager if you don't know. – Phil Miller Aug 12 '13 at 16:36

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