David, you might want to look at "http://velocitysoftware.com/smt.html";
at what are the available metrics and how to use them for chargeback.
Many of our Linux on z installations have a chargeback model, and SMT-2
required some updates to both the model and how to understand the metrics.
On 10/28/2020 11:29 AM, Mittelstädt, David wrote:
Hi Bill,
Thanks for the fast replay. I will read the infos in the given URL tomorrow. We
are using SMT-2. I ran a q multithreading in z/VM and get back Activated
Threads 2 for IFL Core. I'm really interested in the additional information.
Thanks.
Regards,
David
-----Ursprüngliche Nachricht-----
Von: Linux on 390 Port [mailto:[email protected]] Im Auftrag von Bill
Bitner
Gesendet: Mittwoch, 28. Oktober 2020 19:05
An: [email protected]
Betreff: [EXTERN]-Re: IFL usage of Linux servers
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
----------------------------------------------------------------------
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
