Fruits of the Loom – Lightweight Concurrency For the Java Platform
summary
Project Loom prototypes add continuations and fibers plus a fiber scope for structured concurrency; continuations capture execution, fibers are many‑to‑many user threads with ~300‑byte metadata and pay‑as‑you‑go stacks. A custom fiber thread executor for Tomcat (built with Gradle, Spring services, OpenJDK Loom EA) runs load tests via an attack script: fibers handle 1,000 req/s on two kernel threads with 100% success, while plain java.lang.Threads hit only ~58% success at 10 req/s. Limitations: cannot yield when holding native monitors or native stacks.
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chapters (9)
- 0:00Introduction
- 1:35Project Loom overview
- 4:28Defining threads
- 7:20Thread implementation models
- 11:22Limitations of current Java
- 15:17Continuations
- 21:47Fibers
- 27:01Structured concurrency
- 30:20Demo and conclusion
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