Optimizing Java Startup and Warmup: Exploring the Power of CRaC on Embedded
summary
CRaC (Coordinated Restore at Checkpoint) captures a fully warmed JVM snapshot and restarts JVMs from that image, cutting framework startup from seconds to milliseconds—examples show Spring Boot dropping from ~4 s to 38 ms and a Raspberry Pi demo going from a 5 s JAR cold start and 16 s to load 1M CSV rows down to ~6 ms per request after restore. It uses CRIU checkpoint/restore on Linux, requires kernel support now present in Raspberry Pi OS, and is available in Zulu with CRaC; checkpointing writes files, kills the process, and restores almost instantly.
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chapters (8)
- 0:00Introduction and speaker background
- 12:04Java versions and updates
- 22:02Java warmup and JIT compilation
- 28:53AOT vs JIT and CRaC solution
- 33:05Adding CRaC to existing projects
- 36:17CRaC demo on Raspberry Pi
- 42:28Current state and future of CRaC
- 44:55Q&A and closing remarks
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