On Fri, Aug 31, 2018 at 10:27:39AM +0000, Marshall2, John (SSC/SPC) wrote: > Hi, > When gridengine calculates cpu usage (based on wallclock) it uses: > cpu usage = wallclock * nslots > This does not account for the number of cpus that may be used for > each slot, which is problematic. > I have written up an article at: > > https://expl.info/display/MISC/Slot+Multiplier+for+Calculating+CPU+Usage+in+Gridengine > which explains the issue and provides a patch (against sge-8.1.9) > so that: > cpu usage = wallclock * nslots * ncpus_per_slot > This makes the usage information much more useful/accurate > when using the fair share. > Have others encountered this issue? Feedback is welcome. > Thanks, > John
Used to do something similar (our magic variable was thr short for threads). The one thing that moved us away from that was in 8.x grid engine binds cores to slots via -binding. Rather than adding support for another mechanism to specify cores (slots, -binding) it might be a better idea to support calculating cores per slot based on -binding. That said I'm not a huge fan of -binding. If a job has exclusive access to a node then the job can handle its own core binding. If the job doesn't have exclusive access then binding strategies other than linear don't seem likely to be successful. William
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