Could your Java workloads be missing out on something?
summary
Eclipse OpenJ9 in IBM Semeru Runtimes claims roughly half the startup time and half the memory versus typical HotSpot setups, ships six times a year, and powers ~900 IBM product releases. Features include Instant On snapshot start (demo ~200 ms), a shared class cache that halves warm startup, and a cloud compiler that offloads JIT to a separate process improving ramp-up even in tiny containers (225 MB). Most apps are drop‑in (90–95%), but gaps exist: JFR is missing and special flags like -XXcompatibility=elasticsearch are required for some ecosystems.
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chapters (10)
- 0:00Introduction to talk
- 2:09What are Sumer runtimes
- 7:45OpenJ9 for cloud workloads
- 13:42Instant On and Cloud Compiler
- 20:00Adoption challenges explained
- 29:51When OpenJ9 doesn't run apps
- 45:19Measuring performance benefits
- 52:44Common tuning mistakes
- 54:29What's coming in 2024
- 55:32Q&A
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