Processor Utilization Difference Between IBM AIX and Linux on Power

Re:Processor Utilization Difference Between IBM AIX and Linu... by mattzito on Monday October 19, 2015 @05:51PM (#10416051)

It's entirely possible back in those days that you had a tiny LPAR (VM) for your CVS data on a big pSeries box that was shared with a bunch of other resources.

On top of that, it wasn't uncommon to connect those tiny LPARs to shared storage RAID arrays with hundreds of machines on the same array, and allocate them a tiny chunk of two or three disks, and deal with all the contention there.

During that time period, I worked for a hot second at EMC, and was always fascinated to see these types of configurations - where it was very clear you could get MUCH better price/performance by buying Linux pizza boxes and connecting them to local storage - but back in those days it was not acceptable at big companies to do that.

On the flip side, those pSeries and high-end Sun boxes screamed when they were optimized for high I/O and high performance workloads. 15 years ago, and you'd see clusters of these pSeries boxes processing 400k-500k writes/second and up on Oracle and DB2. Truly impressive stuff for 2000 & 2001.

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Re:Processor Utilization Difference Between IBM AIX and Linu... by kpil on Tuesday October 20, 2015 @04:16PM (#10421533)

Hm, no not really. The cvs daemon had the whole machine for itself.

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Re:Processor Utilization Difference Between IBM AIX and Linu... by kjs3 on Tuesday October 20, 2015 @09:19PM (#10422981)

Hm, bullshit. Seriously.

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Re:Processor Utilization Difference Between IBM AIX and Linu... by kpil on Thursday October 22, 2015 @02:26AM (#10430692)

Seriously not bullshit.

To be fair it can be due to a crappy cvs port or related to something that cvs do that does not work well on the non-unixy memmory mapped io model on AIX.

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Re:Processor Utilization Difference Between IBM AIX and Linu... by kjs3 on Friday October 23, 2015 @10:45AM (#10438867)

I've used AIX since it ran on the RT. I've used CVS since a buddy said "hey...this guy has some shell scripts that work better than SCCS" (i.e. the late 80s). I've done OS performance analysis for decades. I'm quite clear on how those boxes perform. Quit doubling down on the bullshit that an unloaded 660 with server class I/O is outperformed by a mobile P3 cramming data down a laptop IDE bus. It never happened. What happened is something like what mattzito described and you just have no idea how real systems are deployed and managed.

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