linux memory cache clear
# clear pagecache only.
sync; echo 1 > /proc/sys/vm/drop_caches
# clear dentries and inodes.
sync; echo 2 > /proc/sys/vm/drop_caches
# clear pagecache, dentries and inodes.
sync; echo 3 > /proc/sys/vm/drop_cacheslinux memory cache clear
# clear pagecache only.
sync; echo 1 > /proc/sys/vm/drop_caches
# clear dentries and inodes.
sync; echo 2 > /proc/sys/vm/drop_caches
# clear pagecache, dentries and inodes.
sync; echo 3 > /proc/sys/vm/drop_cacheslinux memory usage
// linux command for reporting used memory percentage
$ free | grep Mem | awk '{print $3/$2 * 100.0}'
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