[mpich-discuss] Can't receive messages

[Pavan Balaji]

Are matze-debian and notebook of the same architecture (x86_64 and running the same OS/configuration)?

  — Pavan

On Dec 31, 2013, at 9:26 AM, Matthias Neuer <mneuer at web.de> wrote:

> On 12/30/2013 03:23 PM, Rajeev Thakur wrote:
>> There must be a firewall issue. A process on one machine cannot open a TCP connection on the other machine. Only known services like ssh are working.
> 
> I don't think I have any firewall filter rule in my configuration.
> "iptables --list" shows on both machines
> 
> Chain INPUT (policy ACCEPT)
> target     prot opt source               destination
> 
> Chain FORWARD (policy ACCEPT)
> target     prot opt source               destination
> 
> Chain OUTPUT (policy ACCEPT)
> target     prot opt source               destination
> 
> Do you know a log file I can check to find out if the package was refused?
> 
> Thanks for your help
> 
>> 
>> On Dec 30, 2013, at 6:43 AM, Matthias Neuer <mneuer at web.de> wrote:
>> 
>>> On 12/30/2013 12:12 PM, Rajeev Thakur wrote:
>>>> There may be some other connectivity issue between the machines. Does the cpi example from the MPICH examples directory run across the two machines?
>>> 
>>> The cpi-example hangs too. Output:
>>> 
>>> Process 1 of 4 is on matze-debian
>>> Process 3 of 4 is on matze-debian
>>> Process 2 of 4 is on notebook
>>> Process 0 of 4 is on notebook
>>> 
>>> Then it hangs.
>>> Seems like a configuration issue but why are the printf messages transfered correctly?
>>> 
>>> Matthias
>>> 
>>>> On Dec 30, 2013, at 3:58 AM, Matthias Neuer <mneuer at web.de> wrote:
>>>> 
>>>>> Hi.
>>>>> 
>>>>> Unfortunately, this does not solve the problem.
>>>>> 
>>>>> Maybe I should have written that the program hangs after the output in my last post. It waits until MPI_Recv returns which does not happen.
>>>>> 
>>>>> By the way I can login from one machine to the other using ssh, no problem.
>>>>> 
>>>>> Thanks
>>>>> 
>>>>> On 12/30/2013 06:39 AM, Rajeev Thakur wrote:
>>>>>> Try adding an fflush(stdout) after the printf after the recv.
>>>>>> 
>>>>>> On Dec 29, 2013, at 12:50 PM, Matthias Neuer <mneuer at web.de> wrote:
>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> -------- Original Message --------
>>>>>>> Subject: Can't receive messages
>>>>>>> Date: Sun, 29 Dec 2013 19:00:05 +0100
>>>>>>> From: Matthias Neuer <mneuer at web.de>
>>>>>>> To: discuss at mpich.org
>>>>>>> 
>>>>>>> Hi.
>>>>>>> 
>>>>>>> I installed MPICH on 2 machines (called notebook and matze-debian) using
>>>>>>> the same sourcecode. The output of mpichversion is both times:
>>>>>>> 
>>>>>>> MPICH Version:          3.0.4
>>>>>>> MPICH Release date:     Wed Apr 24 10:08:10 CDT 2013
>>>>>>> MPICH Device:           ch3:nemesis
>>>>>>> MPICH configure:        --disable-f77 --disable-fc
>>>>>>> --prefix=/home/matze/mpich-install
>>>>>>> MPICH CC:       cc    -O2
>>>>>>> MPICH CXX:      c++   -O2
>>>>>>> MPICH F77:      no
>>>>>>> MPICH FC:       no
>>>>>>> 
>>>>>>> I wrote a small test program which I send as an attachment.
>>>>>>> On execution on the machine matze-debian I get the following:
>>>>>>> 
>>>>>>> Process 0 is on matze-debian
>>>>>>> Process 2 is on matze-debian
>>>>>>> Process 1 is on notebook
>>>>>>> received: Hello, from number 2 on matze-debian
>>>>>>> Process 2 has sent the message
>>>>>>> Process 1 has sent the message
>>>>>>> 
>>>>>>> I don't receive the message from process number 1, but the output
>>>>>>> suggests that the message was succesfully sent. Actually I checked the
>>>>>>> network traffic using wireshark and matze-debian received a package in
>>>>>>> which I found the sent message. So somehow the program does not
>>>>>>> recognize the arrival of the message.
>>>>>>> 
>>>>>>> When I run the program on a single machine it works.
>>>>>>> 
>>>>>>> I don't know if this is a programming error or a configuration error.
>>>>>>> 
>>>>>>> Thanks for your help
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> <ex1.c>_______________________________________________
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>>>>> 
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--
Pavan Balaji
http://www.mcs.anl.gov/~balaji