> Per Ashok's request here is some data on offlining with > cpu_bulk_remove vs. sequentially with a shell script. > I had 64x system (physical CPU) and 128 (those 64 > hyperthreaded). The system was idle. > Elapsed times are not strikingly different but system/user times are: > > 64 CPU > 128 CPU > (64 physical hyperthreaded) > cpu_bulk_remove shell script > cpu_bulk_remove shell script > all offline real 0m11.231s real 0m10.775s real > 0m26.973s real 0m16.484s > user 0m0.000s user 0m0.056 user > 0m0.000s user 0m0.068s > sys 0m0.072s sys 0m0.448 sys > 0m0.132s sys 0m1.312s > > real 0m11.977s real 0m10.550s real > 0m28.978s real 0m14.259s > user 0m0.000s user 0m0.064s user > 0m0.000s user 0m0.060s > sys 0m0.032s sys 0m0.464s sys > 0m0.152s sys 0m1.432s > > 32 offline real 0m1.320s real 0m2.422s real > 0m1.647s real 0m1.896s > user 0m0.000s user 0m0.000s user > 0m0.000s user 0m0.020s > sys 0m0.076s sys 0m0.232s sys > 0m0.096s sys 0m0.456s > > real 0m1.407s real 0m3.348s real > 0m0.418s real 0m1.198s > user 0m0.000s user 0m0.012s user > 0m0.000s user 0m0.008s > sys 0m0.072s sys 0m0.276s sys > 0m0.044s sys 0m0.244s > > groups of 16 real 0m5.877s real 0m11.403s > user 0m0.000s user 0m0.024s > sys 0m0.140s sys 0m0.408s > > groups of 8 real 0m8.847s real 0m12.078s real > 0m12.311s real 0m12.736s > user 0m0.004s user 0m0.028s user > 0m0.004s user 0m0.076s > sys 0m0.232s sys 0m0.536s sys > 0m0.448s sys 0m1.448s > > real > 0m11.968s real 0m14.314s > user > 0m0.008s user 0m0.084s > sys > 0m0.400s sys 0m1.492s > > With smaller "bulks" cpu_bulk_remove is always better, but > with large ones shell script mostly wins, especially with > hyperthreading (despite of much better system and user times!) > Oops it all wrapped :O I'm attaching the data file instead, sorry about that. --Natalie >
Attachment:
cpu_data
Description: cpu_data
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