Project Leyden - Capturing Lightning in a Bottle
summary
Project Leyden aims to cut Java startup, warm‑up and memory by shifting work out of runtime: it introduces condensers that transform runtime images, a training run model that writes class metadata, persistent profiles and JIT code into CDS archives, and a pre-made phase that installs precompiled code at startup. Prototypes persist profiles and compiled code, load archived code up to ~500× faster, and visibly flatten warm‑up on javac, SPECjvm2008 and Spring Boot; work fields into the JVM with no new language constraints but needs more tooling and tuning.
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chapters (6)
- 0:00Start
- 2:14Shifting computation
- 5:08Constraining dynamism
- 6:36Condensers: Tools for shifting & constraining computation
- 20:44HotSpot Tiered Compilation: A primer
- 42:24Cage study: Spring Boot application framework startup
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