On Fri, 4 Apr 2014, Cameron Brunner wrote:
Mark - I analyzed this issue on a UGE 8.1.4 cluster last fall and found that this process was the simplest way to get some overbooking reported. I think any version of SGE with original share tree code will show this issue. The following steps show how to get one of the share tree booking issues to manifest...this is due to the fact that only one task from a job array is used when calculating online usage and then a large 'adjustment' is added at the end when the final usage is delivered. The adjustment is delivered in one scheduler interval even though that usage was really accrued over the life of the job...this causes a large spike in share tree usage as the adjustment was never decayed.
...
Hi Cameron,Right:- I now see the various problems with task arrays and the share tree. Interesting!
I have started to fix them, but keep getting interrupted by the day job :( But I'll get there.
Thanks for the hints, Mark
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