On Nov 27, 2004, at 10:23 AM, Niyazi Elvan wrote:
> we are new-bees in lam-mpi.we have a problem with lamboot.may be its
> not a problem.we have 16 nodes in our cluster. for example user mpi1
> booted n0-n7 via command
>
> lamboot -v lamhosts
>
> lamhosts file is including n0-n7 hosts' names.there is no problem
> here.after that mpi2 user booted n0-n15 .its all right too.
>
> first question : is it possible to boot a node booted by another
> user as mentioned above.
>
> after booting hosts if one of the users halts the hosts via commad
> lamhalt -v lamhosts other user can not execute any program on its
> nodes.because its nodes are halted by other user.
>
> second question : if it is possible boot at same time, how can i solve
> tihs problem.
LAM tracks processes by LAM session. Normally, there is one session
per user (ie, one for brbarret, one for jsquyres, etc.). Are you using
the same username for different users on the system? If so, it would
be easiest to just have each user have its own username (and best from
a security standpoint as well).
There are situations where a single user needs to have multiple LAM
"universes" on the same machine (batch scheduled jobs is one example).
LAM has support built in for doing this with most batch schedulers
automatically. For other situations, there is an environment variable
that can be used to create a unique "session": LAM_MPI_SESSION_SUFFIX.
You probably want to see the lamboot(1) man page or the LAM/MPI User's
Guide for more information.
Hope this helps,
Brian
--
Brian Barrett
LAM/MPI developer and all around nice guy
Have an LAM/MPI day: http://www.lam-mpi.org/
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