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使用SunJVM比较好的内存分配的参数：
-Xms2048m -Xmx2048m -XX:PermSize=64M -XX:MaxPermSize=512m -XX:MaxNewSize=512m -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSFullGCsBeforeCompaction=2 -XX:+CMSParallelRemarkEnabled -XX:Sof ...