May I surmise from the initials MCL that this is a micro- or milli-code fix for a z196 machine? Is it possible that such a fix has implications on lower architecture boxes like z10's? I have no access to IBMLINK or RETAIN or I would look these things up myself.
The reason I ask such a question is that in several application-oriented CPU reduction efforts in recent years involving COBOL code, I found that some quite large reductions in average CPU time were gained from the elimination or at least from the minimization of MVCL and CLCL instructions in the generated code. If the z196 has a "speedup" fix for these instructions and if that fix could be back-ported to z10's or even to lower-order boxes, a possibly large amount of COBOL application CPU time could be saved over the z universe... Peter > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On > Behalf Of Vernooij, CP - SPLXM > Sent: Friday, July 15, 2011 8:45 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: Z196 Cobol pgm with higher CPU > > I just had it checked and it is MCL 089, available in februari. > RETAIN info: MCL fix U799O089 EC N29799 B28B. > Desc: performance issue seen on customer applications which heavily use > the move char long, move char long extended and move char long Unicode > instructions. -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
