Check free memory in Ubuntu 12.04 LTS and free memory caches

Check free memory

free

To free pagecache (remember to do a “sync” beforehand):

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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