It seems as if some of the basic questions have not been answered, perhaps no one knows.
1. Can the JVM get its source bytes, i.e. the class files from 64 bit storage? Do the java class loaders, place the byte codes into 64 bit storage? 2. Does the JIT produce its output into 64 bit storage? I have briefly scanned the manual IBM 64-bit SDK for z/OS, Java 2 Technology Edition, Version 1.4SDK and Runtime Environment User Guide Also a quick scan of the TOC of the java diagnosis guide and did not see any explicit statements as to what aspect of the 64 bit JVM for z/os exploited 64 bit storage. Are there other documents that could be checked? Perhaps someone as attended a presentation where this type of information was given out. Brad Taylor -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Kirk Wolf Sent: Wednesday, January 02, 2008 12:12 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: The Line, the Bar, Java, LPA, etc. Jikes is a Java compiler that outputs byte-codes. It doesn't change the JVM, and doesn't have anything to do with whether the JVM could use LPA. On Jan 2, 2008 11:55 AM, McKown, John <[EMAIL PROTECTED]> wrote: > > -----Original Message----- > > From: IBM Mainframe Discussion List > > [mailto:[EMAIL PROTECTED] On Behalf Of Kirk Wolf > > Sent: Wednesday, January 02, 2008 11:48 AM > > To: IBM-MAIN@BAMA.UA.EDU > > Subject: Re: The Line, the Bar, Java, LPA, etc. > > > > > > True: A "compiled Java application" consists of .class files or .jar > > files (zip files) containing > > .class files. The .class files contain byte codes which can > > be interpreted > > by the Java virtual machine (JVM). > > > > But: all modern Java virtual machines includes a just-in-time (JIT) > > compiler, which dynamically translates byte codes for frequently > > used methods into native machine instructions. > > So, everyone who insists that "Java is slow" because it is > > interpreted.... > > look for other reasons :-) > > > > So, it is interesting to ask whether the machine-code created by JIT > > could be in LPA. > > The current JVM does not support this, since this machine code is > > dynamically created and not really shareable. > > > > Kirk Wolf > > Dovetailed Technologies > > Do you know if IBM has ported their "jikes" Java compiler to z? If so, > I wonder if the output from that could be LPA resident. > > -- > John McKown > Senior Systems Programmer > HealthMarkets > Keeping the Promise of Affordable Coverage Administrative Services > Group Information Technology > 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
