Butcher Virtual Threads like a pro!
summary
Demo shows creating 1 million virtual threads in ~8 seconds but only when threads just sleep; CPU-bound work on those threads still saturates cores and runs no faster than platform threads. Reproduces a real bug using Toxiproxy + Testcontainers and an Elasticsearch client, finds a synchronized call with the deprecated high‑level client pins virtual threads (detected via jdk.VirtualThreadPinned JFR event), fixes by switching to the modern client or removing synchronization. Warns against swarming tasks, ignoring interrupts, mutating scope values, and misusing virtual threads for CPU work.
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chapters (12)
- 0:00Introduction to virtual threads
- 3:42About the speaker
- 5:49Talk disclaimers and warnings
- 7:33Virtual threads limitations
- 10:24How virtual threads work
- 11:07What not to do with virtual threads
- 15:50Demo pinning virtual threads
- 27:59Quantum physics and virtual threads
- 33:24Parallel streams vs virtual threads
- 40:32Structured concurrency explained
- 45:33Scope values introduction
- 50:14How to misuse virtual threads
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