On Aug 4, 2008, at 13:37 , Ronny T. Lampert wrote:
a) prefer smaller networks to larger ones (i.e. use a 2-node "net"
for a 2-node job rather than allocating two nodes out of a 24-node
net);
b) when starting two 1-node jobs, pack them into the same 2-node
net rather than occupy one node each out of two different node sets.
For both a) and b) you want to read here (I cannot tell you the
exact solution for your problem):
http://www.clusterresources.com/products/maui/docs/5.2nodeallocation.shtml#node
Thank you for the pointer! After reading that chapter, I am pretty
convinced that I can achieve what I want by setting
NODESETPRIORITYTYPE BESTFIT
(although I did not have the opportunity to test).
You can write your own priority function for node allocations. For
you also section "5.2.2.9 LOCAL" might be very interesting.
For example, I have the following
NODEALLOCATIONPOLICY PRIORITY
NODECFG[DEFAULT] PRIORITYF='-JOBCOUNT'
which does the exact reverse of what you want (spread the jobs as
evenly as possible).
As far as I can see, one could use a similar configuration to make
sure jobs are packed within one node; but this does not say anything
about how nodes are allocated with respect to node sets.
A.
--
Ansgar Esztermann
DV-Systemadministration
Max-Planck-Institut für biophysikalische Chemie, Abteilung 105
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