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  1. JDK
  2. JDK-6512013

Tunable Heap settings (e.g. -Xmx) should be tunable after startup.

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      A DESCRIPTION OF THE REQUEST :
      Tuning memory for Java is a time consuming issue, and for some applications it's mostly trial-and-error guesswork. You should be able to change the -Xmx, the garbage collection algorithm, the generation sizes, etc after the program is already running.

      JUSTIFICATION :
      Not all applications can be re-run any time you want to tweak memory settings. Sometimes you predict poorly, and see an OOM errory coming, but can do nothing about it because you can bump the -Xmx up 64M to get the machine out of load balancing.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      I'd expect to be able to use something on the command line to update an existing JVM, e.g.

      java -Xmx512m -p 545

      Would reset the JVM running at pid '545' to have the maximum heap size of 512m.


      ACTUAL -
      You watch JVMs die, you waste time trying bad settings.

            phh Paul Hohensee
            ndcosta Nelson Dcosta (Inactive)
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