On 05/25/2012 11:51 AM, William Hay wrote: >> We have a group of nodes with 12 slots. >> We submit there parallel jobs requesting 4 or 12 slots. >> We defined 2 PEs allocating 4 or 12 slots and associated to that group >> of nodes in one queue. > What do you mean be PE allocating 4 or 12 slots. You have 4 or 12 in > the allocation rule. Or the > slots field
I mean that "allocation_rule" is set to 4 or 12. >> Is this expected behavior or are we doing a configuration error? Or is >> it a bug? Or a feature? > It depends somewhat on what else is going on. If the 4 slot jobs are > shorter they might be getting > in via backfill. Alternatively there might be jobs of higher > priority than your 12 slot jobs eating all the reservations > for other purposes. Fourthly the reservation behavior can sometimes > be less than optimal when selecting where to run. All jobs are being started with the same s_rt, so no backfill should be happening, right? And no, there are no jobs with higher priority eating the reservations. > I'd recommend enabling the schedule log file and taking a look at what > is happening. I already enabled it. My first observations show me that the job asking for 12 slots gets a reservation on a node running also a 12 slot job. Later, when a 4 slot job finishes, a new 4 slot job starts on that 4 empty slots. I would have expected the node with that 4 empty slots to get reserved ... But thinking more on it ... perhaps because the 3 jobs J[123]_4 - started on a 12 slots node N1 - got started at different times, the last one started could have been started *after* another job J4_12 running on 12 slots on node N2. So job J3_4 will end *after* J4_12 - since both have equal default_duration - and therefore N2 gets reserved and N1 starts another Jn_4 4 slots job when one of J[12]_4 finishes ... Can anyone understand what I am trying to understand and explain in these two last sentences? 8) Many thanks again, Richard -- Richard Ems mail: [email protected] Cape Horn Engineering S.L. C/ Dr. J.J. Dómine 1, 5º piso 46011 Valencia Tel : +34 96 3242923 / Fax 924 http://www.cape-horn-eng.com _______________________________________________ users mailing list [email protected] https://gridengine.org/mailman/listinfo/users
