IBM Mainframe Forum

[gokulNmf]

Hi,

When i give the command TSO TIME in my ispf screen, the command executes and prompts

IKJ56650I TIME-02:28:29 AM. CPU-00:00:01 SERVICE-65819 SESSION-00:37:31 DECEMBE
R 16,2010

In this
Time - is current time
Session- is the total time since the session is started
& day

What is CPU here, it is always 00:00:01 what is its significance?
what is Service, each time i execute its value changes?

Thanks in Advance

[Robert Sample]

CPU is the actual CPU time used, as opposed to the elapsed (wall clock) time. Service units is an IBM measurement of system usage:

One “service unit” originally related to an actual hardware performance measurement (a specific model’s instruction performance). However, that relationship disappeared many years ago as hardware and software evolved. MSUs (million service units) are now like other common (but physically imprecise) measurements, such as “cans of coffee” or “tubes of toothpaste.” (Cans and tubes can vary in physical size depending on brand, market, and other factors. Some coffee cans contain 13 ounces and others 500 grams, for example.)

[Bill Dennis]

Each processor/speed combination has a different SU coefficient. Your RMF CPU reports will display your value. This is the number that is multiplied with CPU seconds to get Service Units used. This allows for a common measurement of a unit of work on machines of varying speeds.

If you issue the TSO TIME command after doing other work in your session, you should see CPU time consumed has increased along with the Service Units.

[gokulNmf]

Hi,

Thank you Robert and Bill.