CHAPLIN, JAMES (CTR) writes: > On the zLinux guest (ZP013), using sar I get a CPU usage of about 15%: [...] > But under Perfkit (zVM) we get the following exception message, 33.5% > CPU: > > 11:51:51 FCXUSL317A User ZP013 %CPU 33.5 exceeded threshold 30.0 for 5 > min. [...] > We have two > IFLs defined to the guest. [...] > Why are the numbers from PERFKIT different from the zLinux environment?
PerfKit percentages are calculated as "percentage of one engine". Linux percentages calculate "percentage of CPU resource available to the image". For your Linux guest with 2 engines, Linux tells you it's using ~15% of its 2-engines'-worth. PerfKit spells that as ~30% of a nominally-100%-utilised single engine. Same resource usage, different way of displaying the measurement. [For the purposes of this posting, I'm treating any remaining few percent difference as a second order effect or else we'd muddy the waters with discussing a bunch of more complex measurement issues.] --Malcolm -- Malcolm Beattie System z SWG/STG, Europe IBM UK ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
