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<TITLE>RE: [mpich-discuss] MPICH2 works if executed on single machine buthangs over network.</TITLE>
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<P><FONT SIZE=2>Hi,<BR>
The problem seems to be with the network setup of the machines.<BR>
Are there any firewalls running on the machines (The firewalls could be rejecting the socket connections)?<BR>
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)?<BR>
<BR>
Regards,<BR>
Jayesh<BR>
<BR>
-----Original Message-----<BR>
From: mpich-discuss-bounces@mcs.anl.gov [<A HREF="mailto:mpich-discuss-bounces@mcs.anl.gov">mailto:mpich-discuss-bounces@mcs.anl.gov</A>] On Behalf Of Angus Grandison<BR>
Sent: Friday, August 21, 2009 11:34 AM<BR>
To: mpich-discuss@mcs.anl.gov<BR>
Subject: [mpich-discuss] MPICH2 works if executed on single machine buthangs over network.<BR>
<BR>
I have used MPICH2 on a number of windows "clusters" with no problem.<BR>
<BR>
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.<BR>
<BR>
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.<BR>
<BR>
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.<BR>
<BR>
Can I use MPICH2 (64 bit) with 32bit executables?<BR>
<BR>
TIA<BR>
<BR>
Angus<BR>
<BR>
--<BR>
_______________________________________________________________________<BR>
<BR>
Dr Angus Grandison<BR>
Fire Safety Engineering Group<BR>
School of Computing and Mathematical Sciences University of Greenwich Old Royal Naval College 30 Park Row Greenwich SE10 9LS London UK<BR>
<BR>
web (group) : <A HREF="http://fseg.gre.ac.uk">http://fseg.gre.ac.uk</A><BR>
web (personal) : <A HREF="http://staffweb.cms.gre.ac.uk/~a.j.grandison/">http://staffweb.cms.gre.ac.uk/~a.j.grandison/</A><BR>
<BR>
<A HREF="mailto:A.J.Grandison@gre.ac.uk">mailto:A.J.Grandison@gre.ac.uk</A><BR>
<BR>
Phone : +44 (0)20-8331-7912<BR>
Fax : +44 (0)20-8331-8925<BR>
_______________________________________________________________________<BR>
<BR>
<BR>
University of Greenwich, a charity and company limited by guarantee, registered in England (reg no. 986729). Registered Office: Old Royal Naval College, Park Row, Greenwich SE10 9LS.<BR>
<BR>
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