-------- 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