[mpich-discuss] MPID_nem_tcp_connpoll(1826): Communication error with rank 0: Connection refused
Miguel Angel Fernández
mafga74 at hotmail.com
Sat Oct 22 17:01:01 CDT 2011
I disabled the "ufw" and the error continue :-(
Miguel Angel
> Date: Sat, 22 Oct 2011 16:47:57 -0500
> From: balaji at mcs.anl.gov
> To: mafga74 at hotmail.com
> CC: mpich-discuss at mcs.anl.gov
> Subject: Re: [mpich-discuss] MPID_nem_tcp_connpoll(1826): Communication error with rank 0: Connection refused
>
>
> [Please keep mpich-discuss cc'ed. I tend to ignore MPI question emails
> sent directly to me.]
>
> Ubuntu does install a firewall automatically, AFAIK. You can check:
>
> % sudo ufw status
>
> -- Pavan
>
> On 10/22/2011 04:38 PM, Miguel Angel Fernández wrote:
> > Unles Ubuntu installs a firewall automaticly, I don't understand what
> > can be the problem.
> >
> > Anyway, I'm going to install the WireShark (Ethereal) on Ubuntu. Maybe
> > this clarify the problem.
> >
> > Thanks
> > Miguel Angel
> >
> > > Date: Sat, 22 Oct 2011 16:20:43 -0500
> > > From: balaji at mcs.anl.gov
> > > To: mpich-discuss at mcs.anl.gov
> > > CC: mafga74 at hotmail.com
> > > Subject: Re: [mpich-discuss] MPID_nem_tcp_connpoll(1826):
> > Communication error with rank 0: Connection refused
> > >
> > >
> > > It picks whichever port it can find. It's not fixed.
> > >
> > > This does look like a firewall problem. Most firewalls, keep the ssh
> > > port (22) open, so being able to do an ssh doesn't mean there's no
> > firewall.
> > >
> > > On 10/22/2011 03:46 PM, Miguel Angel Fernández wrote:
> > > > Hi Rajeev
> > > >
> > > > Thanks for your response but there is no any firewall among them.
> > > >
> > > > mpi0 is Ubuntu
> > > > mpi1 to mpi4 are Debian (minimun distribution without GUI)
> > > >
> > > > I am doing the conection among them with ssh and it is well configured
> > > > and properly working, I tested it.
> > > > I am thinking,...are you using a socket conettion to comunicate the
> > > > diferent processes? This could be the problem in the Ubuntu one (mpi0).
> > > > If this is the case, can you tell me the exactly socket you are using?
> > > >
> > > > Thanks
> > > > Miguel Angel
> > > >
> > > >
> > > > > From: thakur at mcs.anl.gov
> > > > > Date: Sat, 22 Oct 2011 15:30:26 -0500
> > > > > To: mpich-discuss at mcs.anl.gov
> > > > > Subject: Re: [mpich-discuss] MPID_nem_tcp_connpoll(1826):
> > > > Communication error with rank 0: Connection refused
> > > > >
> > > > > Make sure the 5 machines can communicate with each other, i.e., there
> > > > is no firewall preventing connections.
> > > > >
> > > > > Rajeev
> > > > >
> > > > > On Oct 22, 2011, at 12:36 PM, Miguel Angel Fernández wrote:
> > > > >
> > > > > > Hello everybody
> > > > > >
> > > > > > I'm trying to fix a problem that appear when I execute one of the
> > > > mpich2 program examples.
> > > > > > As you can see, if I execute a normal command there are no
> > > > problems. The cluster work properly.
> > > > > >
> > > > > > mpi at mpi0:~$ mpiexec -f ./mpich2-install/machinefile -n 5 hostname
> > > > > > mpi0
> > > > > > mpi2
> > > > > > mpi3
> > > > > > mpi1
> > > > > > mpi4
> > > > > > mpi at mpi0:~$
> > > > > >
> > > > > > but when I try to execute the program, the results are something
> > > > like this
> > > > > >
> > > > > > mpi at mpi0:~$ mpiexec -f ./mpich2-install/machinefile -n 5
> > > > /home/mpi/mpich2-install/workspace/Prueba/Debug/Prueba
> > > > > > Hello MPI World the original.
> > > > > > Hello MPI World the original.
> > > > > > Hello MPI World the original.
> > > > > > Hello MPI World the original.
> > > > > > Hello MPI World the original.
> > > > > > From process 0: Num processes: 5
> > > > > > Fatal error in MPI_Send: Other MPI error, error stack:
> > > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfcbe268, count=26,
> > > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
> > > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
> > > > Connection refused
> > > > > > Fatal error in MPI_Send: Other MPI error, error stack:
> > > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfb32ca8, count=26,
> > > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
> > > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
> > > > Connection refused
> > > > > > Fatal error in MPI_Send: Other MPI error, error stack:
> > > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfa49e98, count=26,
> > > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
> > > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
> > > > Connection refused
> > > > > > Fatal error in MPI_Send: Other MPI error, error stack:
> > > > > > MPI_Send(173)..............: MPI_Send(buf=0xbfa57538, count=26,
> > > > MPI_CHAR, dest=0, tag=0, MPI_COMM_WORLD) failed
> > > > > > MPID_nem_tcp_connpoll(1826): Communication error with rank 0:
> > > > Connection refused
> > > > > >
> > > > > > Do you have any idea what can be the problem?
> > > > > >
> > > > > > Thank you in advance
> > > > > > Miguel Angel
> > > > > >
> > > > > > _______________________________________________
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> > > > >
> > > > > _______________________________________________
> > > > > mpich-discuss mailing list mpich-discuss at mcs.anl.gov
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> > > >
> > > > _______________________________________________
> > > > mpich-discuss mailing list mpich-discuss at mcs.anl.gov
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> > >
> > > --
> > > Pavan Balaji
> > > http://www.mcs.anl.gov/~balaji
>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
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