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5.1 Virtual Threads vs OS Threads & Scalability
Topic Summary
Learn how Java 21 decouples threads from the operating system, allowing 1,000,000 concurrent tasks per JVM.
What You Will Learn
• Contrast platform OS threads (1MB stack) vs Virtual Threads (heap-allocated, ~few hundred bytes).
• Understand carrier threads and ForkJoinPool scheduler.
• Spawn virtual threads with `Executors.newVirtualThreadPerTaskExecutor()`.
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