Check to see if the lamd's are still running on all nodes when this
problem occurs. If they are dying for some reason (or being killed),
that could explain this behavior.
On May 24, 2007, at 3:47 PM, K. Charoenpornwattana Ter wrote:
> On 5/24/07, Jeff Squyres <jsquyres_at_[hidden]> wrote:
> That is just weird -- I don't think I've seen a case where tping
> worked (implying that inter-lamd communication is working), but
> running applications did not.
>
> Yes, it's kinda weird. I just noticed something, After running
> mpirun, tping doesn't work anymore, See below.
>
> [ter_at_uftoscar test]$ lamboot -v host
> LAM 7.1.3/MPI 2 C++/ROMIO - Indiana University
>
> n-1<12514> ssi:boot:base:linear: booting n0 (uftoscar)
> ...
> n-1<12514> ssi:boot:base:linear: finished
> [ter_at_uftoscar test]$ tping -c 3 n0-13
> 1 byte from 13 remote nodes and 1 local node: 0.007 secs
> 1 byte from 13 remote nodes and 1 local node: 0.005 secs
> 1 byte from 13 remote nodes and 1 local node: 0.006 secs
>
> 3 messages, 3 bytes (0.003K), 0.017 secs (0.340K/sec)
> roundtrip min/avg/max: 0.005/0.006/0.007
> [ter_at_uftoscar test]$ mpicc ring.c -o ring.out <---
> LAM's mpicc
> [ter_at_uftoscar test]$ mpirun -np 13 ring.out
> <freeze> (so I pressed Ctrl-C to cancel)
>
> ********************* WARNING ***********************
> This is a vulnerable region. Exiting the application
> now may lead to improper cleanup of temporary objects
> To exit the application, press Ctrl-C again
> ********************* WARNING ************************
> [ter_at_uftoscar test]$ tping -c 3 n0-13
> <freeze> :-(
>
> The only thing that I can think of is that there is some firewalling
> in place that only allows arbitrary UDP traffic through...? (inter-
> lamd traffic is UDP, not TCP) That doesn't seem to make sense,
> though, if MPICH works (cexec uses ssh, which is most certainly
> allowed). But can you triple check that there are no firewalls tcp
> rules in place that restrict UDP/TCP traffic? (e.g., iptables)
>
> I did. no firewall is running on any nodes.
>
> [root_at_uftoscar ~]# service iptables status
> Firewall is stopped.
> [root_at_uftoscar ~]# service pfilter status
> pfilter is stopped
> [root_at_uftoscar ~]# cexec service iptables status
> ************************* oscar_cluster *************************
> --------- oscarnode1---------
> Firewall is stopped.
> .....
> --------- oscarnode13---------
> Firewall is stopped.
>
> [root_at_uftoscar ~]# cexec service pfilter status <-- I already
> removed pfilter.
> ************************* oscar_cluster *************************
> --------- oscarnode1---------
> pfilter: unrecognized service
> ....
> --------- oscarnode13---------
> pfilter: unrecognized service
>
> Also try running tping / mpirun / lamexec from a node other than the
> origin (i.e., the node you lambooted from).
>
> I did. same problem.
>
> On May 23, 2007, at 11:32 PM, K. Charoenpornwattana Ter wrote:
>
> > Try some simple tests:
> >
> > - Does "tping -c 3" run successfully? (It should ping all the
> lamd's)
> >
> > [ter_at_uftoscar test]$ tping -c 3 n0-13
> > 1 byte from 13 remote nodes and 1 local node: 0.006 secs
> > 1 byte from 13 remote nodes and 1 local node: 0.005 secs
> > 1 byte from 13 remote nodes and 1 local node: 0.005 secs
> >
> > 3 messages, 3 bytes (0.003K), 0.016 secs (0.368K/sec)
> > roundtrip min/avg/max: 0.005/0.005/0.006
> >
> >
> > - Does "lamexec N hostname" run successfully? (It should run
> > "hostname" on all the booted nodes)
> >
> > No, it doesn't work. It only show headnode's hostname. See below:
> >
> > [ter_at_uftoscar ~]$ lamexec N hostname
> > uftoscar.latech
> > <freeze>
> >
> > I, however, can execute "cexec hostname" with no problem.
> >
> > - When you "mpirun -np 15 ring.out", do you see ring.out
> executing on
> > all the nodes? (i.e., if you ssh into each of the nodes and run ps,
> > do you see it running?
> >
> > I only see one ring.out run on headnode, no ring.out running on
> > other nodes.
> >
> >
> > Thanks
> > Kulathep
> > _______________________________________________
> > This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
>
> --
> Jeff Squyres
> Cisco Systems
>
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
--
Jeff Squyres
Cisco Systems
|
