EG: -Xms1500m -Xmx1500m [-server] # fix the heap size at 1.5GB Advantages are: (a) Dynamic heap resizing is avoided thereby avoiding issues to do with object copies, heap fragmentation, generational gc etc (b) Garbage collection is avoided as long as possible. I like to run my VM heap fixed at about 75-85% of primary memory. I would have thought the IO costs to do with logging, perhaps check-pointing, etc would have been significant, perhaps even dominant. Discounting, of course fitness evaluation for "non-trivial" problems.
-- Shane Magrath Doctoral Researcher University of Technology Sydney PH: 61 2 9514 2527
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