linux手动释放cache

author:skate
time:2014/07/1

 

linux手动释放cache

 

1. 确认当前的drop_caches时候为默认值“0”
# more /proc/sys/vm/drop_caches 
0

2.手动执行sync命令，确保系统的完整性，将全部未写的系统缓冲区写到磁盘中，包含已修改的i-node、已延迟的块I/O和读写映射文件
# sync

3.手动释放cache
# echo 3 > /proc/sys/vm/drop_caches

另：
release pagecache
#echo 1 > /proc/sys/vm/drop_caches;

release dentries and inodes
#echo 2 > /proc/sys/vm/drop_caches;

relase pagecache, dentries and inodes
#echo 3 >/proc/sys/vm/drop_caches.