[mpich-discuss] MPICH2 works if executed on single machine buthangs over network.

[Jayesh Krishna]

Hi,
 The problem seems to be with the network setup of the machines.
 Are there any firewalls running on the machines (The firewalls could be
rejecting the socket connections)? 
 Can you run non-MPI programs (mpiexec -n 2 -machinefile mf.txt hostname)
? Have you tried using different set of hosts (One host might be having a
problem but others might not - This could also help you in debugging any
pblms in the n/w)?

Regards,
Jayesh 

-----Original Message-----
From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Angus Grandison
Sent: Friday, August 21, 2009 11:34 AM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] MPICH2 works if executed on single machine
buthangs over network.

I have used MPICH2 on a number of windows "clusters" with no problem.

I have set up a new cluster and it seems to work if the program has 2
processes on a single computer but fails if I use 2 computers. I have
debugged my own code and found that it hangs on the first MPI_BCast it
encounters.  The cpi program appears to behave in a similar fashion e.g
After entering an interval the program hangs even if the interval is zero.

I am using MPICH2 (32bit) on a set Windows XP 64 machines. Just to note
that this setup works successfully on a different set of Windows XP 64
machines.

Are there any known problems with network cards and how they need to be
setup?  The cards in my problem machines are INTEL Pro/1000 EB with I/O
acceleration.

Can I use MPICH2 (64 bit) with 32bit executables?

TIA

Angus

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_______________________________________________________________________

Dr Angus Grandison
Fire Safety Engineering Group
School of Computing and Mathematical Sciences University of Greenwich Old
Royal Naval College 30 Park Row Greenwich SE10 9LS London UK

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mailto:A.J.Grandison at gre.ac.uk

Phone : +44 (0)20-8331-7912
Fax :   +44 (0)20-8331-8925
_______________________________________________________________________


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