On 18/05/2021 1:52 am, Kirk Wolf wrote:
- good low-overhead (sampling) profiling tools for the z/OS JVM don't exist (maybe this has changed?). IMO this was a huge barrier for Java on z/OS.
Unfortunately, othing has changed :( z/OS only partially supports the JVMTI implementation. Hopefully, now IBM/OpenJ9 is open source the Java tooling landscape will improve. RedHat supports Flight Record in their OpenJDK distros and IMO z/OS should at the very least have the same. I say again, Java on z/OS needs a lot more love then it's currently getting. z/OS is supposed to be the flagship IBM OS. We've started to introduce Kotlin to modernize our tooling as IBM are too slow updating Java versions on z/OS. So far it's been a success. Kotlin adds some runtime overhead due to additional boilerplate code but it's well worth it. Null safety, no checked exceptions and type safe builders alone are a good enough reason to start transitioning, albeit slowly.
- Sometimes CPU costs don't matter where time to market or functionality are more important or where the application doesn't run that much.
Agreed. And I suppose that was Andrew's point. If his Java product can run quick enough as a batch utility then happy days. If it runs like a stallion on a zIIP :two-thumbs-up:
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