Linux手动释放内存

手动释放内存

1.sync将内存中的缓存写入磁盘

2.  to free pagecache, use echo 1 > /proc/sys/vm/drop_caches; 

     to free dentries and inodes, use echo 2 > /proc/sys/vm/drop_caches;

　  to free pagecache, dentries and inodes, use echo 3 >/proc/sys/vm/drop_caches.