Virtual Threads: Taming the Wild Multithreading Beast
summary
Shows that Java 21 virtual threads let code create many cheap threads using startVirtualThread and newVirtualThreadPerTaskExecutor; a demo spawns 100,000 threads sleeping 1s to prove platform threads hit OOM while virtual threads survive. Benchmarks: virtual threads hit ~840 req/s on a no-delay endpoint vs ~38 for platform threads, but drop to ~547 vs 124 when each request forces unmounting, revealing mounting/unmounting overhead and pinning from synchronized or native calls. Structured concurrency scopes (shutdown-on-success/failure) simplify cancelling and joining child tasks.
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chapters (9)
- 0:00Introduction to virtual threads
- 5:14Virtual vs platform threads
- 7:27Creating virtual threads
- 11:30How virtual threads work
- 14:41When virtual threads fail
- 19:41Thread pinning issues
- 22:53Designing with virtual threads
- 26:26Structured concurrency
- 34:07Key takeaways and Q&A
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