drop_caches doesn't drop all caches
I try this command:
$ sudo su -c 'sync && echo 3 > /proc/sys/vm/drop_caches; free'
And here's result:
As my understand, it is normal. I suggest you open up 2 Terminals, the first one run "watch -n 1 'free -m'" and the second run the "sync && echo 3 > /proc/sys/vm/drop_caches" to see the memory cache from the first down immediately.
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