Radoslaw Skorupka wrote: >Except ...it doesn't answer the question: HOW CPU RECOGNIZE ITS OWN FAILURE?
I don't have the original documents (Redbooks/Share presentations/KC/etc.) from IBM, but in short this is what happens (from my failing/decaying memory): Each CPU (on an IBM mainframe) consists of two halves. Both halves are executing an instruction and the results are compared. If there is a difference, then the instruction is retried. If still there is a difference, somehow the CPU is giving the instruction and the rest of the cache to another [unoccupied] CPU and then turns itself of and announce its own status to the hardware. Sorry for not having the full details, but this is what I remember ... Oh, of course, If I am wrong or the process described above changed, please correct me. Groete / Greetings Elardus Engelbrecht ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
