> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Phil Smith III > Sent: Wednesday, February 06, 2008 4:45 AM > To: [email protected] > Subject: Re: CPU time differences for the same job > >
[snip] > > No, you aren't. HPO 3.4 added "Active Wait", which was > interesting enough that it was granted a patent (cf. > http://www.freepatentsonline.com/4631674.html). Modern VMs > use the TPZI instruction (Test Pending Zone Interrupts), > which basically says "Mr. PR/SM, please wake me up when I > have something to do". Without it, PR/SM wouldn't work real > well. (ObAnecdote: there were plenty of DOS-based PC > programs that polled -- typically for keyboard interrupts -- > in a fashion conceptually similar to Active Wait, and were > really poor citizens under Windows until cured.) > [snip] > ...phsiii TPZI??? Yet another undocumented System z instruction? -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- 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
