Mat分析dump文件

先占个坑
mat内存分析方法：

SELECT * FROM INSTANCEOF java.lang.Object t WHERE (toHex(t.@objectAddress) >= "0x4e8000000" AND toHex(t.@objectAddress) <= "0x6a8000000")

wget命令

https://blogs.oracle.com/poonam/how-do-i-find-whats-getting-promoted-to-my-old-generation