Re: [OMPI users] Xgrid and choosing agents...

[Luis Vitorio Cargnini]

Hi,


So you have capacity for 32 process in parallel.

# This is an example hostfile. Comments begin with
# #
# The following node is a single processor machine:
foo.example.com
 # The following node is a dual-processor machine:
bar.example.com slots=2
# The following node is a quad-processor machine, and we absolutely
# want to disallow over-subscribing it:
 yow.example.com slots=4 max-slots=4
so in your case like mine you should have something like:
your.hostname.domain slots=8 max-slots=8 # for each node

I hope this will help you.
Regards.
Vitorio.


Le 09-07-11 à 10:56, Klymak Jody a écrit :

So you have 4 nodes each one with 2 processors, each processor 4-core - quad-core. I think that only using the hostfile is enough is how I use. If you to specify a specific host or a different sequence, the mpirun will obey the host sequence in your hostfile to start the process, also can you put how you configured your host files ? I'm asking this because you should have something like:

Hi all,







I tried making a hostfile and then specifying the host, but I get:




application:
 ../build/mitgcmuv
The requested hosts were:
 xserve01.local

so I assume --host doesn't work with xgrid?

Is a reasonable alternative to simply not use xgrid and rely on ssh?

Thanks,  Jody

--
Jody Klymak
http://web.uvic.ca/~jklymak

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Sorry in advance if these are naive questions - I'm not experienced in running a grid... I'm using openMPI on 4 duo Quad-core Xeon xserves. The 8 cores mimic 16 cores and show up in xgrid as each agent having 16 processors. However, the processing speed goes down as the used processors exceeds 8, so if possible I'd prefer to not have more than 8 processors working on each machine at a time. Unfortunately, if I submit a 16-processor job to xgrid it all goes to "xserve03". Or even worse, it does so if I submit two separate 8- processor jobs. Is there anyway to steer jobs to less-busy agents? /usr/local/openmpi/bin/mpirun -n 8 --hostfile hostfile --host xserve01.local ../build/mitgcmuv Some of the requested hosts are not included in the current allocation for the

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