>the detailed MVS capture ratio discussions imply that MVS isn't even bothering >to do the clock accounting for large parts of the kernel (and in some cases >has been as high as 60%).
A long time ago, in a lab far far away, IBM made a (possibly erroneous) decision when CPU was expensive to not measure everything. The rough guideline, so I was told was it took 4-8000 instructions to measure an event. So, anything under 20K was not worth it (again, I'm quoting what I was told from [old] memory). Also, at the time, no console activity measured (ie: operator commands). Some things changed when SMF Typ30-6 waw introduced (System Address Spaces). - -teD 300,000 Kilometres per Second Not only is it a good idea! It's the LAW!!! ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
