Virtual Threads Arrive in JDK 21, Ushering a New Era of Concurrency

Re:Virtual Threads Arrive in JDK 21, Ushering a New Era of C... by nicktelford on Wednesday April 12, 2023 @08:44AM (#35538742)

Lock contention IIRC

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Re:Virtual Threads Arrive in JDK 21, Ushering a New Era of C... by the-alchemist on Wednesday April 12, 2023 @09:03AM (#35538980)

Yeah, poor performance and memory usage. In the Java world, thread locals are java.lang.ThreadLocal, basically a hashmap from thread to variable.

Using a ThreadLocal is (usually) a code smell. It's optimized / supposed to be used with just a few threads, not millions.

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Re:Virtual Threads Arrive in JDK 21, Ushering a New Era of C... by kaba0 on Wednesday April 12, 2023 @09:54AM (#35539692)

For what it worth, there actually is a separate JEP (I believe this: https://openjdk.org/jeps/429 ) for a new, scope-bases solution that promises much better performance.

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Re:Virtual Threads Arrive in JDK 21, Ushering a New Era of C... by layer8 on Wednesday April 12, 2023 @09:21AM (#35539200)

But the lock would only need to be per platform thread?

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