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  1. JDK
  2. JDK-8198510 Enable UseDynamicNumberOfGCThreads by default
  3. JDK-8199513

Release Note: Garbage Collectors Adaptively Scale the Number of Threads by Default

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      The number of threads garbage collectors use in the garbage collection stop-the-world pauses determine the number of threads to use based on the maximum size of the Java heap. The flag -XX:UseDynamicNumberOfGCThreads is now true (enabled) by default.

      This improves startup time and reduces resource usage particularly for Java applications run with a small Java heap.

      If you experience performance reductions particularly on applications that use a small amount of Java heap, you can disable this new behavior by specifying -XX:- UseDynamicNumberOfGCThreads on the command line.

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              mdoerr Martin Doerr
              tschatzl Thomas Schatzl
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