> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:ibm-m...@bama.ua.edu] On Behalf Of Paul Gilmartin > Sent: Friday, June 05, 2009 10:34 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: EXEC Above the Bar (Was Large Page Support) > > On Thu, 4 Jun 2009 18:33:35 -0500, Rick Fochtman wrote: > > >Jim, a completely different question: can you give us any > idea or hint > >when we can expect to use executable code above the bar? > > > Dream on. > > But it must happen, sooner or later. > > But IBM might not preannounce it. > > >In my shop, we have programs that are executed literally thousands of > >times per day and program fetch is a significant part of the time > >involved. Adding these programs to LPA/ELPA/MLPA/EMLPA isn't > practical > >because of private area impacts, especially with DB2 and IDMS. > > > A while back I asked on this list whether the below-the-bar > restriction > of LPA was being felt as constraining. Apparently, now, the answer > is "yes". > > Can Java byte code be kept in LPA?
Java byte code is not executable. I.e., not a LoadModule or a ProgramObject. From a z/OS viewpoint, it is data. So, I doubt that it could be loaded into LPA. Now, [E]CSA? probably. Maybe even HVCOMMON. > > Can Java byte code be loaded above the bar? Can't say for sure, but with the 64-bit JVM, why not? The JVM itself resides in 31-bit storage, as would any JIT compiled code, but the byte code is data in the z/OS sense, > > I could see a use for load modules marked RMODE(64),OL, and > even for an enhanced LPA to support sharing them, without > the requirement for TCB, RB, etc. support. That might be the "first" to be implemented. For large, shared, read-only data tables. > > -- gil -- 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 john.mck...@healthmarkets.com * 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
