Re: [OMPI users] Problem with MPI_Send and MPI_Recv

[Terry Dontje]

Hello Sofia, Looking at your stack trace it is what I thought was 
happening and that is one process is stuck trying to connect to the 
other. The stack unfortunately does not give enough information as to 
why. The only suggestion I could give is walk through a debuggable 
version of the code from ompi_init_do_preconnect and see if you can find 
where the process is calling connect and see if the connect call is 
failing. If you don't have a firewall I am not sure what is then 
blocking the connection from happening. Either the address somehow is 
being mashed up or something else. --td Date: Mon, 22 Sep 2008 10:49:41 
+0200 From: "Sofia Aparicio Secanellas" <sapari...@grpss.ssr.upm.es> 
Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv To: "Open 
MPI Users" <us...@open-mpi.org> Message-ID: 
<2F607CC2B43A422B80CEBBD540BFFE8B@aparicio1> Content-Type: text/plain; 
charset="iso-8859-1"; Format="flowed" Hello Terry, I do not have an 
active firewall. I have typed on both computers: netstat -lnut I enclose 
you the results. I have also written on both computers: mpirun -np 2 
--host 10.1.10.208,10.1.10.240 --mca mpi_preconnect_all 1 --prefix 
/usr/local -mca btl self,tcp -mca btl_tcp_if_include eth1 
./PruebaSumaParalela.out I enclose you the results. Thank you. Sofia 
----- Original Message ----- From: "Terry Dontje" <terry.don...@sun.com> 
To: <us...@open-mpi.org> Sent: Friday, September 19, 2008 7:54 PM 
Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv

> Hello Sofia,
>
> After further reflection I wonder if you have a firewall that is 
> preventing connections to certain ports.
>
> --td
>
> Terry Dontje wrote:
  
>> Hello Sofia,
>>
>> Ok, so I really wanted the stack of when you run with "-mca 
>> mpi_preconnect_all 1"  I believe you'll see that one of the processes 
>> will be in init.  However, the stack still probably will not help me help 
>> you.  What needs to happen is to step through the code in dbx while the 
>> connection is trying to be established.  I am hoping you might find the 
>> connect call fails or that we've been given an interface that somehow 
>> cannot reach the other node.  However, when you specified "-mca 
>> btl_tcp_if_include eth1" that should have forced things to use the 
>> interface you need.  So it really comes down to why are we not connecting 
>> to the eth1 address?  Are we failing on routing to that address or is the 
>> connect failing because we are trying to use a port that we are not 
>> really allowed to use or is it something else?
>>
>> I don't think it is a routing problem since you are able to reach each 
>> node via ssh.  Is there someone else on the list that might want to lend 
>> a hand here?  I feel like I am missing something obvious going on here.
>>
>> --td
    
>>> Date: Fri, 19 Sep 2008 16:09:11 +0200
>>> From: "Sofia Aparicio Secanellas" <sapari...@grpss.ssr.upm.es>
>>> Subject: Re: [OMPI users] Problem with MPI_Send and MPI_Recv
>>> To: "Open MPI Users" <us...@open-mpi.org>
>>> Message-ID: <1BBF50FE29F743B5829CC3785F47CADD@aparicio1>
>>> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>>>
>>> Hello Terry,
>>>
>>> I have installed 1.2.7 and I obtain the same result.
>>>
>>> I will explain you what I have done.
>>>
>>> 1. On my computer edu@10.1.10.240 I have added a new user called sofia. 
>>> This way I have sofia@10.1.10.208 and sofia@10.1.10.240.
>>> 2. I have downloaded the openmpi 1.2.7 from the openmpi website on both 
>>> computers in /home/sofia/Desktop.
>>> 3. I have installed everything using "sudo ./configure", "sudo make" and 
>>> "sudo make install".
>>> 4. To make ssh not ask me for a password. I have typed in 
>>> sofia@10.1.10.208 "ssh-keygen -t dsa", "cd $HOME/.ssh" and "cp 
>>> id_dsa.pub authorized_keys". I have copied the directory 
>>> "/home/sofia/.ssh" from sofia@10.1.10.208 to /home/sofia/.ssh in 
>>> sofia@10.1.10.240. The ssh  command without password works on computer 
>>> sofia@10.1.10.208  but computer sofia@10.1.10.208 ask me for a 
>>> passphrase and for the password. Is it normal?
>>> 5. I have created a directory "/home/sofia/programasparalelos" on both 
>>> computers and I have given permissions to the directory with "chmod 
>>> 777".
>>> 6. I have copied on both computers in "/home/sofia/programasparalelos" 
>>> the program "PruebaSumaParalela.c" (I have changed a little bit the 
>>> program, I enclose you the new program) and I have compiled using "mpicc 
>>> PruebaSumaParalela.c -o PruebaSumaParalela.out".
>>>
>>> 7. Now I run the program on both computersusing the command:
>>>
>>> mpirun -np2 --host 10.1.10.208,10.1.10.240 --prefix /usr/local 
>>> ./PruebaSumaParalela.out
>>>
>>>  When I run the program I obtain 3 PIDs executing on every computer, 2 
>>> of "./PruebaSumaParalela.out" and 1 of  "mpirun -np2 --host 
>>> 10.1.10.208,10.1.10.240 --prefix /usr/local ./PruebaSumaParalela.out". I 
>>> enclose you the results obtained on every computer for every 
>>> "./PruebaSumaParalela.out".
>>>
>>> Thank you very much.
>>>
>>> Sofia
>>>
      
>>
>>
    
>