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Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv
From: saparicio_at_[hidden]
Date: 2008-10-01 10:19:17

The problem is the WiFi connection!

We were connecting the computers using WiFi, we have changed to a cable
connection and the program is working.

It seems that the port that MPI_Send and MPI_Recv use is closed.

Do you know which port use these commands?

Thank you,

> On Sep 30, 2008, at 12:02 PM, Sofia Aparicio Secanellas wrote:
>>> 1. From prior mails, you do not seem to have iptables running to
>>> block any ports -- is there any other port blocking software
>>> running, perchance?
>> I do not think so. What can I do to be sure that I do not have any
>> other port blocking software running?
> Test that random TCP ports can connect to each other. Perhaps
> something like this on computer 1:
> computer1$ nc -lp 123456
> Then on your other computer:
> computer2$ telnet computer1 123456
> If the "telnet" connects, then you should be able to type anything and
> have it appear on computer1 (where nc) is running. Hit Ctrl-C in the
> window where "nc" is running to kill the connection.
> If this works, then you likely do not have port blocking software
> running.
>> How can I do to attach the MPI processes with a debugger?
>> I have used before:
>> dbx - PID
>> where
>> It seems that the results that I have obtained were not very helpful.
> Ah yes, sorry, this thread has been so long that I missed that. I see
> the stack traces, and like Terry said, it shows that the sends and
> receives are pending, but not *why*. Well, let's see the results of
> the "nc" test from above before deciding how to move onward...
> --
> Jeff Squyres
> Cisco Systems
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