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. On Dec 30, 2013, at 6:43 AM, Matthias Neuer <[email protected]> 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 <[email protected]> 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:

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Try adding an fflush(stdout) after the printf after the recv.

On Dec 29, 2013, at 12:50 PM, Matthias Neuer <[email protected]> wrote:

...

-------- Original Message -------- Subject: Can't receive messages Date: Sun, 29 Dec 2013 19:00:05 +0100 From: Matthias Neuer <[email protected]> To: [email protected]

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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