On 2/20/09 10:22 AM, "Reuti" <re...@staff.uni-marburg.de> wrote: Am 20.02.2009 um 14:36 schrieb Prentice Bisbal: > Bill Broadley wrote: >> SGE does seem the default for >> many small/medium clusters these days (and is the Rocks default) >> but does make >> some things strangely hard, usually with a work around though. In >> particular >> I find the lack of a straight forward way to handle requesting >> nodes and >> processors per node strange. > > Me, too. Users are asking me for ppn=x functionality like Torque/PBS > has, and I'm finding pretty complicated to implement on SGE. Well, you have to setup nearly identical PEs like openmpi2, openmpi4 with a fixed allocation rule of 2 or 4 respectively. OTOH: Once I looked into Torque and found, that with "nodes=2:ppn=2" I got just one node with 4 slots in total of course. I don't know, whether it can still happen to get such a distribution. yes, you certainly can get such a distribution with torque. Moab and Maui can be configured to remap a nodes=X:ppn=Y to some other configuration to improve utilization, but you can turn that feature off and then the user gets precisely the distribution that they request. As far as I know work is being done to allow the behavior to be chosen at submit time. -- Glen L. Beane Software Engineer The Jackson Laboratory Phone (207) 288-6153
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