Concurrency
Virtual Threads and the Pinning Problem
Virtual threads scale until something nails one to its carrier. Here is what still pins on modern JDKs, and how to see it happen.
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Articles
Long-form writing on the JVM, its runtimes, and the frameworks built on them.
Runtime
What the JIT Actually Does to Your Hot Loop
Tiered compilation, on-stack replacement and inlining decide how your loop really runs. Here is how to read those decisions instead of guessing.