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

[Matthias Neuer]

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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