[MPICH] Machine with multiple IP addresses

[David Ashton]

Sophie Duchesne,

 

>From the limited information given, this appears to be an error on a Windows
machine using MPICH 1.2.5.  We recommend all users to use the current
project, MPICH2, instead of MPICH.  You can get it here:

http://www.mcs.anl.gov/mpi/mpich2

 

Try compiling with MPICH2 and see if this solves your problem.

 

If there still is an error there are several ways to select a specific
network interface.  You can use the MPICH_NETMASK environment variable to
mask off a range of IP addresses you want to use or you can use the
MPICH_INTERFACE_HOSTNAME environment variable to specify a specific IP
address.  You can also set the interface hostname through a machine file by
adding -ifhn x.x.x.x to each line after the host name.

 

Examples:

mpiexec -env MPICH_NETMASK 192.168.123.0/24 -n 3 myapp.exe

mpiexec -env MPICH_INTERFACE_HOSTNAME 192.168.123.101 -host foo -n 1 myapp :
-env MPICH_INTERFACE_HOSTNAME 192.168.123.102 -host bar -n 1 myapp : .

 

If you have to use MPICH 1.2.5, please read the manual that comes with it to
see how to select a specific IP address.

 

-David Ashton

 

  _____  

From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Sophie Duchesne
Sent: Wednesday, September 21, 2005 12:44 PM
To: mpich-discuss at mcs.anl.gov
Subject: [MPICH] Machine with multiple IP addresses

 

Hello all,

 

I am very new to MPICH and to parallel computing. One machine in our cluster
has 2 IP addresses. I am still trying to figure out how I can configure
MPICH in order for it to know which address to use. Currently, it does not
use the right address and I get this kind of messages:

 

            Error 10065, process 5, host <hostname> Unable to connect to <IP
address> on port <port number>

 

Thank you for your help!

 

Sophie Duchesne

 

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