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JVM?? ArrayList? ??? ??? ??? ????

BigObject? ????? ?????, ?? ??? ??? ????

???? ygc? ???? ???? arrayList ??? ?? ??? ???? ??? ?? ? ??? ???? ????? ???? ygc ??? obj = new BigObject()? ??? ??? ???? list.add(obj)? ???? old->young ??? ?? ??? ?? ????? ?? ???

??? ??

?? ??? ?????:
????: /jdk1.7.0_79.jdk/bin/java -Xmx500M -Xms500M -Xmn200M -XX:+UseConcMarkSweepGC -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=90 -XX:+PrintGCApplicationConcurrentTime -XX: +PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -XX:+PrintGCDateStamps -XX:+PrintHeapAtGC -XX:+PrintGCDateStamps -verbose:gc -XX:+PrintGCDetails -Xloggc:/Users/*/temp/test.gc.log

gc.log? ?? ??() ???? ??? ??? ?? ??? ??? 90% ?? ???? CMS GC? ?? ????? ???? ? ?? ??? ?????.