A timer unit (or a CPU second) measures the length of time that the CPU(s) was/were being used. How much work can be accomplished in that length of time depends on how powerful the processor is. The so-called "processor constant" is used to try to take that into account. Hence the use of MSUs to measure processor power and the use of service units to measure workload, since not all CPUs are created equal,
Bill On Mon, 18 Aug 2008 20:10:01 +0000, Jan Vanbrabant <[EMAIL PROTECTED]> wrote: >*** Cross-posted in the IBM-MAIN & IMS-L listservers) *** > >Hi, > >Either Iâm getting old (or at least too old to understand), or Iâm stupid, or Iâm too tired to understand (after a long day gazing at my laptop screen) ⦠> >One way of doing accounting for billing purposes in IMS is based on the DLRTIME field in the Application termination accounting log record (xâ07â). >(Thereâs also DLREXTIM field, which is new in IMS V10, while we are V9. Anyway this is not important in this discussion.) >IMS TYPE07 log record CPU timer-unit field, DLRTIME, indeed allows to capture the CPU time used by a running transaction. This execution time is expressed in so-called âTimer Units (TU)â. >TU is a z/OS notion (STIMER-, STIMERM-, TIME-, TTIMER-macros), not an IMS concept. > >ASKQQA item RTA000060992 (19920318) about âTIMER UNITS (TU) conversion to CPU timeâ says: <One timer unit (TU) is approximately 26.04166 microseconds. You can multiply that value with the number of TUs reported in the type x'07' log record.> > >Looking into the latest SA22-7607-13 zOS V1R9.0 MVS Programming Assembler Services Reference Vol 2 (IARR2V-XCTLX) (iea2a981) (April 2008) timer units still are âapproximately 26.04166 microseconds per unitâ ⦠>After more than 16 years ago with a couple of technology changes & much faster processor cycles, a TU still equals 26.04166 microseconds??? >There is something I donât understand â¦. > >The real question is: how can I take into account the technology evolution from a pre-z to a z machine (for example) in the accounting/billing scheme? >Pls shed some light in the darkness of my mind. > >Jan > > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
