下面是linux上的解释,不知道aix是否可以用类似方法,手工释放disk cache(echo 3 > /proc/sys/vm/drop_caches)
Clearing the disk cache
For experimentation, it's very convenient to be able to drop the disk cache. For this, we can use the special file /proc/sys/vm/drop_caches. By writing 3 to it, we can clear most of the disk cache:
$ free -m total used free shared buffers cachedMem: 1504 1471 33 0 36 801-/+ buffers/cache: 633 871Swap: 2047 6 2041$ echo 3 | sudo tee /proc/sys/vm/drop_caches 3$ free -m total used free shared buffers cachedMem: 1504 763 741 0 0 134-/+ buffers/cache: 629 875Swap: 2047 6 2041
Notice how "buffers" and "cached" went down, free mem went up, and free+buffers/cache stayed the same.