Loom Virtual Threads in the JDK 20
summary
Loom brings cheap, JVM-level threads that detach tasks from platform threads by suspending stacks to the heap via continuations, enabling nonblocking IO at scale; demos show 1 million virtual threads in <6s, start times in microseconds and per-thread memory ~100KB now (goal ~10KB), and a Spring Boot demo using newVirtualThreadPerTaskExecutor with stack traces showing continuation yield/run suspension. Virtual threads migrate across platform workers, pin when synchronized or calling native code, and target IO-heavy workloads (not CPU-bound parallelism); structured concurrency and scope values are incubating.
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chapters (4)
- 0:00Start
- 9:532004: Java Util Concurrent
- 55:44The Travel Agency Example
- 56:43Stuctured Concurrency Based Travel Agency
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