On Thu, Nov 30, 2017 at 12:21 PM, Frank Swarbrick < frank.swarbr...@outlook.com> wrote:
> I have a heavy, perhaps unjustified prejudice, against Java and the JVM. > I like "native compiled" languages, and I am very happy that IBM is looking > to have Swift as another native compiled language on z/OS. The z/OS Java SDK has both JIT and AOT compilation from java byte codes to native machine instructions. Like it now? ;-) I think that the performance of z/OS Java is pretty good. My complaints: - on z/OS, the startup costs (class loading and JITing time) required to get a big application up and running efficiently. It has gotten better though. - the overhead and complexity of JNI To generalize, Java applications are big and slow because of how they are written - programmers glue together a bunch of very large frameworks without much concern for resource usage. In the past, there weren't decent profilers on z/OS, which makes this worse. I haven't tried the new sampling profiler support for z/OS Java yet ("Health Center") - has anyone? Kirk Wolf Dovetailed Technologies http://dovetail.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN