On 07/29/2010 08:04 AM, Shmuel Metz (Seymour J.) wrote: > In <[email protected]>, on 07/24/2010 > at 02:38 PM, Frank Swarbrick <[email protected]> said: > >> I've been told that CICS on z/OS (we just migrated from VSE) >> inherantly utilizes multiple CPs > > That is correct; CICS has multiple tasks performing various overhead > functions. If a shop spends a lot of CPU time in those tasks, then > additional CPU's will speed up CICS. However, if as appears to be the > case at your shop, most of the CPU time is spent executing transaction > code, then additional CPU's won't help without multiple AOR's or > threadsafe applications. > And in our experience, prior to use of DB2 by CICS transactions (threadsafe wasn't an option then), we NEVER saw a single CICS region exceed 100% of one CPU on MVS. But that may be because in that environment by the time you got one region running near the high 90% CPU range, response went to heck and splitting the load into multiple regions became mandatory. With DB2 in the picture, it was possible to see a hot region run 120% to 140% of one CPU and still get decent transaction response.
-- Joel C. Ewing, Fort Smith, AR [email protected] ---------------------------------------------------------------------- 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
