Hi,
Thanks for your hints Jeff.
I've just tried without any firewalls on involved machines, but the issue
remains.
# /etc/init.d/ip6tables status
ip6tables: Firewall is not running.
# /etc/init.d/iptables status
iptables: Firewall is not running.
The machines have the host names "node1", "node2" and "node3".
I launch the basic program on one machine, asking node1 and node2 to be hosts.
Typing `netstat -a | grep node1` from node2 shows me that node1 and node2 are
connected by tcp, as the connection is marked as ESTABLISHED. I have the same
thing when I do `netstat -a | grep node2` from node1. However, the program
keeps blocking.
What else could provoke that failure ?
--
Benjamin BOUVIER
________________________________________
To start, I would ensure that all firewalling (e.g., iptables) is disabled on
all machines involved.
On Jun 11, 2012, at 10:16 AM, BOUVIER Benjamin wrote:
> Hi,
>
>> I'd guess that running net pipe with 3 procs may be undefined.
>
> It is indeed undefined. Running the net pipe program locally with 3
> processors blocks, on my computer.
>
> This issue is especially weird as there is no problem for running the example
> program on network with MPICH2 implementation, for 2 processes.
>
> However, with MPICH2, it fails with 3 processes and blocks also on connect
> ("Connection refused"), which could indicate that it's actually a network
> issue, with both MPICH2 and OMPI. I don't know how many connections OMPI use
> to send the data in the example program, but with the assumption that it
> tries to open 2 connections (while for the same program, MPICH2 only uses one
> connection, which is another hypothesis), maybe the number of connections is
> the right way to look for. I'll ask MPICH2 users on their mailing list, so as
> to get their opinion about it.
>
> Now that I know the program doesn't work both with OMPI and MPICH2
> implementations, I guess it's not dependant of MPI implementation.
>
> If you have any ideas or comments, I would be pleased to hear them.
>
> --
> Benjamin Bouvier
>
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--
Jeff Squyres
[email protected]
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