[mpich-discuss] Fwd: Can't receive messages

[Matthias Neuer]

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
>>>>>>
>>>>>>
>>>>>>
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