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Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv
From: Sofia Aparicio Secanellas (saparicio_at_[hidden])
Date: 2008-10-01 03:28:07


I have tried with
nc -lp 9999
and it was working pefectly everything I write on computer2 I can see on
computer1.

Thank you very much.

Sofía
----- Original Message -----
From: "Jeff Squyres" <jsquyres_at_[hidden]>
To: "Open MPI Users" <users_at_[hidden]>
Sent: Tuesday, September 30, 2008 9:11 PM
Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv

> 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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