리눅스 /proc/sys/vm/drop_caches 캐쉬정리

명령어

pagecache 해제
echo 1 > /proc/sys/vm/drop_caches

dentries, inodes 해제
echo 2 > /proc/sys/vm/drop_caches

pagecache, dentries, inodes 모두 해제
echo 3 > /proc/sys/vm/drop_caches

sync
free
echo 1 > /proc/sys/vm/drop_caches