> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Peter Relson > Sent: Thursday, April 01, 2010 6:46 AM > To: [email protected] > Subject: Re: DATOFF Nucleus routines > > >how much overhead would be saved by doing this using real > addresses as > opposed to virtual, > none, even if you didn't have the extra overhead of setting > up to use, and > branching to, the DATOFF MVCL function in order to do a move > using real > addresses (and even if your virtual storage happened to be backed by > contiguous real). > > >and using one MVCL instruction > You could have done your AR-mode stuff with one MVCL > instruction too if > you wanted. If you're comparing MVCL to MVPG, the odds are > good that MVPG > wins. > If you're comparing a single long MVCL to multiple MVPG's, > I'd still guess > that MVPG wins, but I defer to the expertise of others on the > matter of > instruction performance. > > Peter Relson > z/OS Core Technology Design
I could well be mis-remembering, but I think somebody said that the MVCL millicode in the z series actually does use MVPG when things are aligned properly. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- 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
