Re: [Xen-users] Problems w/ Xen and MPICH2

[Brock Palen <brockp@xxxxxxxxx>]

We use OpenMPI and Lam MPI on some xen boxs, (RHEL4 images)  with no issues.  

I dont know why it would work on the one domU and not the others.

Brock Palen

Center for Advanced Computing

brockp@xxxxxxxxx

(734)936-1985

On Feb 22, 2007, at 9:05 PM, Bhatia, Nikhil wrote:

Hello Xen-o-Enthusiasts,

 

I am trying to use MPICH2-1.0.5 on Xen-3.0.3 dom-Us that have been fired using FC-5 images. Now, I will try to explain a bit about my setup. I have 3 domUs

 

192.168.37.50 :  vcl050

192.168.37.51 :  vcn051

192.168.37.52 :  vcn052

 

All domUs have exactly same images. I have built and installed mpich2-1.0.5 on FC-5 and installed it in a shared directory (accessible by all DOM-Us). I installed it by logging as bhatia@xxxxxxxxxxxxx  (and not root). Now, when I start mpd on 192.168.37.50 like this:

 

bhatia@xxxxxxxxxxxxx:> mpd –daemon

bhatia@xxxxxxxxxxxxx:> mpdtrace         

192

bhatia@xxxxxxxxxxxxx:> mpiexec -np 1 /bin/hostname

192.168.37.50

 

So, everything works fine up till now. Now the problem is that when I try to follow the same steps on a different DOM-U (i.e. vcn051), I get the following:

 

bhatia@xxxxxxxxxxxxx:> mpd --daemon

bhatia@xxxxxxxxxxxxx:> mpdtrace

mpdtrace (mpdtrace 57): got eof on console

bhatia@xxxxxxxxxxxxx:> mpdtrace

mpdtrace (mpdtrace 57): got eof on console

bhatia@xxxxxxxxxxxxx:> mpdtrace

bhatia@xxxxxxxxxxxxx:> mpdtrace

192                                                                              --------------------------à eventually mpd gets started successfully

bhatia@xxxxxxxxxxxxx:> mpiexec -np 1 /bin/hostname

mpiexec_192.168.37.51 (mpiexec 375): no msg recvd from mpd when expecting ack of request                 -------------------------------------à BREAKS here

 

 

Same is the story with another DOM-U (i.e. vcn052) where I try to start mpd as root:

 

[root@192 ~]# mpd --daemon

[root@192 ~]# mpdtrace

mpdtrace (mpdtrace 57): got eof on console

[root@192 ~]# mpdtrace

[root@192 ~]# mpdtrace

192

[root@192 ~]# mpiexec -np 1 /bin/hostname

mpiexec_192.168.37.52 (mpiexec 365): no msg recvd from mpd when expecting ack of request

 

Can you see the problem here? Did any of you also face similar problems?

 

Thanks,

Nikhil

 

 

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