> > My thought to use PLO is that it is direct hardware serialization. >
No IBM processors have implemented PLO directly in hardware. On current machines, it is implemented in millicode as a spin lock, I think with one lock per LPAR zone. So all PLO instructions in the same LPAR zone contend for the same lock. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- 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
