[mpich-discuss] Fwd: Can't receive messages
reuti at staff.uni-marburg.de
Mon Dec 30 04:58:09 CST 2013
Am 30.12.2013 um 10:58 schrieb Matthias Neuer:
> 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.
For me it's working even without `fflush`. Do you see anything in the "messages" file on the machine where rank 0 is running?
Just for curiosity: does adding an MPI_Barrier before the MPI_Finalize change anything for you?
> 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
>>> 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
>>> 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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