Hi Ralph,
Thank you for you help. This is exactly what I wanted!
Regards,
Jason
Ralph Castain wrote:
Hmmm...well, here is one way to do it:
mpirun -n 1 -host n0 ./master_worker : -n N-1 -host +e ./master_worker
What this will do is put rank 0 on the first node in your allocation,
and then all the remaining ranks on the remaining nodes in the
allocation. All the ranks will be in the same comm_world.
Check out "man orte_hosts" for a detailed explanation (with examples)
of this "relative node indexing" syntax.
HTH
Ralph
On Sep 10, 2009, at 3:57 PM, jgans wrote:
A single app:
mpirun -N ./master_worker
Regards,
Jason
Ralph Castain wrote:
Is the master a different app, or is the same app used?
In other words, do you run this as:
mpirun -n 1 ./master: -n N worker
or
mpirun -N ./master_worker
Either way, I can advise you on a better way to accomplish your goal
On Sep 10, 2009, at 2:58 PM, Jason D. Gans wrote:
Hi,
I have a master/worker bioinformatics application where the master
has a
higher memory overhead than the workers. I want to restrict the master
node to a single slot (to prevent the master node from getting
oversubscribed and having workers compete for precious ram), while all
other non-master nodes can be oversubscribed (infinite max_slot).
Regards,
Jason
I guess I'm puzzled, then. First, hostfile and Torque work fine
together in the 1.3 series - it was the 1.2 series that had the
problem.
Second, the default max_slot setting is taken from the slots
allocated
to you by Torque. I don't see the purpose in changing them - you can
always oversubscribe the node anyway.
Perhaps you could explain more about what you are trying to do? You
may find that there is a much simpler solution already in place.
On Sep 10, 2009, at 2:07 PM, Jason D. Gans wrote:
What OMPI version are you talking about?
version 1.3.1
On Sep 10, 2009, at 1:40 PM, Jason D. Gans wrote:
Hello,
I would like to use a custom hostfile (that changes the default
max_slot
values for certain nodes). My understanding of the FAQ is that
this is
*not* possible with Torque. Therefore, is is possible to
disable use
of
Torque at runtime (via an argument to mpirun), or do I need to
recompile
to remove Torque support altogether.
Regards,
Jason Gans
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