The STCKE result, like the STCK result, is architecturally guaranteed to be unique across all the CPUs used by an operating system image (i.e., within an LPAR). This is not a sysplex statement; sysplex is not an architectural construct. The STCKF result, on the other hand, is not guaranteed unique; using STCKF is better for cases where you do not need that uniqueness. The STCK instruction might have to spin in some cases where the same CPU issues consecutive STCK's very close together. STCKE theoretically might have to do so too but in practice I think does not, due to the significantly greater granularity.
Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
