[MPICH] EOF from console

[Ralph M. Butler]

Hi Matthew:

mpdtrace is one of the mpd "console" programs.  It does not wait forever for an
mpdp to respond.  This error msg is telling us that there was no response from
the mpd.  mpdtrace does not know why of course.  So, we have to assume that the
mpd was (becaame) inaccessible for some reason.

It is not clear if the problem is adding a fifth or the particular fifth
being added.  I will assume that problem always arises adding in a host
named board05.  Can you reproduce the problem by starting an mpd on
board01 and then immediately adding in board05?  If this reproduces the
problem, it implies that there is some issue with board05 itself. In
that case, I would suggest using mpdcheck on board05 as discussed in the
Troubleshooting portion of the install manual.

--ralph

On Mon, 12 Jun 2006, tjue1 at sussex.ac.uk wrote:

> Date: Mon, 12 Jun 2006 16:49:08 +0100
> From: tjue1 at sussex.ac.uk
> To: beowulf at beowulf.org, mpich-discuss at mcs.anl.gov
> Subject: [MPICH] EOF from console
> 
> Hi list
>
> Im doing some experiments on an embedded platform and am building a
> Beowulf cluster from them. I have a unusual setup as the boards have
> limited memory and i am using MPICH 2 (latest). The setup is a bit
> strange as Python is accessable to the boards via an NFS mount.
>
> I can start an MPD daemon on a single board with no problems. I can
> also add a further three to the ring with no probs. Adding a fith
> causes an error. (see below)
>
> (im adding nodes manually rather than using mpdboot. When I get it
> working manually I will get mpdboot working.
>
> Heres the problem:
>
> (from first board)
>
> mpdtrace -l
> board01_2048 (10.9.10.1)
>
> I then add others into the ring as:
>
> mpd -h board01 -p 2048 &
>
> mpdtrace
> board02
> board01
>
> I can continue to add boards until I try and add a 5th. When adding a
> 5th using the above method I get:
>
> mpdtrace &
> mpdtrace (mpdtrace 57): got eof on console
> Jul 22 08:33:49 board05 python2.3: mpdtrace (mpdtrace 57): got eof on
> console
>
> I have to admit im baffled. Can anyone shed some light on this? If more
> specific information will help please tell me.
>
> Regards
>
> Matthew