[mpich-discuss] mpdboot handshake problem

[Qi Ying]

I did follow the guide and everything works as it should.
What confuses me is I can manually start the mpd manually without
problem, for example:

[qying at n002 ~]$ mpd &
[qying at n002 ~]$ mpdtrace -l
n002.newwolf.edu_39682 (192.168.0.2)

[qying at n001 ~]$ mpd -h n002 -p 39682 &
[qying at n001 ~]$ mpdtrace
n001
n002

[qying at n001 ~]$ mpdringtest
time for 1 loops = 0.000439882278442 seconds

Seems everything is working fine. It is just that n002 does not work.
I have 19 additional nodes running on the system and they are all
working fine.

Qi

On Tue, May 6, 2008 at 12:21 PM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:
> It could be something with the networking configuration on the machines. You
> can debug the problem by using the mpdcheck utility and following all the
> steps described in the installation guide.
>
> Rajeev
>
>
>
> > -----Original Message-----
> > From: owner-mpich-discuss at mcs.anl.gov
> > [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Qi Ying
> > Sent: Tuesday, May 06, 2008 12:04 PM
> > To: mpich-discuss at mcs.anl.gov
> > Subject: [mpich-discuss] mpdboot handshake problem
> >
> > Hi All,
> >
> > Recently I had trouble starting mpd using mpdboot on my cluster. This
> > seems caused by a single node in the system (n002). The following is
> > the debugging output. However, I can manually start mpd on n001 and
> > n002 (and have them join the ring), and there is no problem. Any
> > insights or suggestions?
> >
> > Thanks,
> >
> > Qi Ying
> >
> > [qying at n001~] $ mpdboot -n 2 -f ~/mpd.hosts --rsh=/usr/bin/rsh -v -d
> >
> > running mpdallexit on n001.newwolf.edu
> > LAUNCHED mpd on n001.newwolf.edu  via
> > debug: launch cmd= /opt/mpich2/bin/mpd.py   --ncpus=1 -e -d
> > debug: mpd on n001.newwolf.edu  on port 55059
> > RUNNING: mpd on n001.newwolf.edu
> > debug: info for running mpd: {'ncpus': 1, 'list_port': 55059,
> > 'entry_port': '', 'host': 'n001.newwolf.edu', 'entry_host': '',
> > 'ifhn': ''}
> > LAUNCHED mpd on n002  via  n001.newwolf.edu
> > debug: launch cmd= /usr/bin/rsh -n n002 '/opt/mpich2/bin/mpd.py  -h
> > n001.newwolf.edu -p 55059  --ncpus=1 -e -d'
> > debug: mpd on n002  on port 54319
> > mpdboot_n001.newwolf.edu (handle_mpd_output 385): failed to handshake
> > with mpd on n002; recvd output={}
> >
> >
> >
>
>