Kernels 2.6.16 and newer provide a mechanism to havethe kernel drop the page cache and/or inode and dentry caches oncommand, which can help free up a lot of memory. Now you can throw awaythat script that allocated a ton of memory just to get rid of thecache...
To use /proc/sys/vm/drop_caches, just echo a number to it.
To free pagecache:
# 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:
As this is a non-destructive operation and dirty objects are not freeable, the user should run "sync" first!echo 3 > /proc/sys/vm/drop_caches
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