LINUX

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1)查看
free -m

2)同步到硬盘
sync

3)释放页面
echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
echo 3 > /proc/sys/vm/drop_caches

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java垃圾回收：
?java -verbose:gc

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查看进程占用内存情况
ps/top 查到PID
cat /proc/PID/status