Hello David, An important aspect of this is whether you are running SMT-2 or not. If you are, then I recommend you read https://www.vm.ibm.com/perf/tips/smtutil.html for some background as when SMT-2 is on we have to take extra care because in that scenario the word "IFL" is ambiguous between whether we're referencing the Core or the two threads in aggregate, as with SMT-2 many of the measures, but not all, are of a logical processor (aka thread) perspective. If you share whether you're SMT-2 or SMIT-1 or SMT-0 (SMT disabled). I can give you some additional information on interpreting the data.
Regards, Bill ___________________________________________________________________________________________ Bill Bitner - z/VM Client Focus and Care - 607-429-3286 [email protected] "Making systems practical and profitable for customers through virtualization and its exploitation." - z/VM From: "Mittelstädt, David" <[email protected]> To: [email protected] Date: 10/28/2020 01:30 PM Subject: [EXTERNAL] IFL usage of Linux servers Sent by: Linux on 390 Port <[email protected]> Hi everyone, I need a little help understanding the values from the z/VM Performance Toolkit and command line tool hyptop. I want to measure the IFL utilization of a z/VM guest running linux from a z/VM or hardware perspective, e.g. linux server A consumes 2 IFL or linux server B consumes 0.5 IFL. We need this information for accounting and forecast purposes. So I used the tool hyptop to get the information of the used cpu, but I'm not sure how to interpret these values correctly. What means the column cpu(%)? Is this the usage of 1 IFL in percent? And is this same value like the one in the z/VM Performance Toolkit %CPU under 21. User resource usage? Is it possible to measure the IFL usage with these values? Or do I need other values? Thanks in advance. Best regards, David Mittelstädt ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
