> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Kirk Wolf > Sent: Tuesday, August 04, 2009 10:07 AM > To: [email protected] > Subject: Re: Java question > > On Tue, Aug 4, 2009 at 7:49 AM, McKown, John > <[email protected]>wrote: > > > > > Java bytecode is not executable by the CPU. It is > intepreted by the JVM. > > There is no reason that I can think of, from a z/OS > standpoint, why the > > bytecode could not be loaded into above the bar storage. > > > > > The z/OS SDK may interpret, but frequently used bytecode is > dynamically > compiled into efficient machine instructions. Additionally, the "AOT" > support in SDK 6 allows you to use a system cache to reuse > compiled bytecode > between JVMs. > > Kirk Wolf > Dovetailed Technologies > http://dovetail.com
True. If the JVM does a JIT compile, then the resulting executable code must be below the bar. But the bytecode itself can still reside above the bar. I don't know how the JIT compiler works, but I can imagine it "tuning" itself so that it does not use an excessive amount of below the bar storage. We're not a Java shop. I'm likely the only person who around who has any interest. I wish that we were in a position (financially & managerally) to get a zAAP and train programmers to use Java, especially in CICS. -- 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
