We are trying to measure performance of Linux guests under zVM using the
tools available on Linux ( top vmstat sar ) along with monitor data from
CP. In an unconstrained VM system the cpu usage as measured by VM and
Linux is about the same . If we then start up a looping virtual machine to
act as a cpu soak these figures diverge quite a lot . Rob van der Heij
touched on this over two years ago in this forum " IMHO the BogoMips should
at least be corrected for what PR/SM or CP say your unvoluntary wait was. I
would not be surprised to find more areas in Linux where elapsed time is
assumed to be equal to CPU time. ".
Whilst accepting that this is probably a combination of the way the CP
scheduler is handling the users and also the Linux virtual machines method
of measuring time does anybody know of a Linux utility for performance
measurement that understands that it is working under VM.
thanks
Clive Jordan
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