Simple tweaks to get the most out of your JVM
summary
Claims concrete wins: OpenJ9 reports 51% faster startup vs HotSpot; enabling -Xshareclasses in a demo cuts Open Liberty startup from ~3s to ~2.3s (docker images show ~2s vs 6.5s without sharing). JIT server offloads compilation to keep throughput stable under tight memory, trading local CPU for sustained performance. CRIU checkpoint/restore shows cold starts dropping toward ~0.2s for some apps. Demo uses JVM options file and simple start/stop runs to prove effects.
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chapters (13)
- 0:00Intro
- 3:00Why JVM
- 6:50How JVM has changed
- 10:15Why should developers care
- 12:00Types of JVMs
- 12:55Hotspot JVM
- 17:10OpenLiberty
- 21:05Tuning the JVM
- 27:55OpenJ9 Class Data Sharing
- 30:36Demo
- 34:50Idle Tuning
- 37:13Future Tech
- 39:09Recap
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