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Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-10-01 19:43:53


I can't think of any reason why Open MPI wouldn't work over a WiFi
connection unless there's some weirdness in the wireless driver.

On Oct 1, 2008, at 5:19 AM, Sofia Aparicio Secanellas wrote:

> The problem is with 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 are closed.
> Do you know which port are using the MPI_Send and MPI_Recv commands?
>
> Thank you!!!
>
> Sofia
>
>
> ----- 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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-- 
Jeff Squyres
Cisco Systems