Java堆内存
http://www.importnew.com/19593.html
https://www.ibm.com/developerworks/cn/java/j-lo-JVMGarbageCollection/
https://www.ibm.com/developerworks/cn/java/j-jtp10283/index.html
JVM 堆内存，参数优化
原文：http://www.cnblogs.com/fupeng/p/6727953.html
