> What hardware are you on? > > I ask because a z196 has some high CPU costs for certain PSW Key- > related instructions. > > For example, SPKA (Set PSW Key from Address) on a z196 shows up in > CICS CPU figures because it stalls the pipeline when changing PSW > keys between key 8 and key 9 -- or even when it doesn't change keys > e.g. it is just 'going' from key 8 to key 8! > > SPKA may be executed in CICS more than you think (consider User > Exits -- GLUEs and TRUEs -- some of which may have been inserted by > your monitoring software). > > Older (z10) and newer (zEC12) hardware does not have this SPKA problem.
https://listserv.ua.edu/cgi-bin/wa?A2=ind1211&L=IBM-MAIN&P=R24496&I=-3&X=-&Y=d10jhm1%40us.ibm.com&d=No+Match%3BMatch%3BMatches Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
