キャッシュ メモリー 解放

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



Before:
$ free -m
             total       used       free     shared    buffers     cached
Mem:          7973       7923         49          0       1091       5144
-/+ buffers/cache:       1686       6286
Swap:         2047         46       2001



$ sync; echo 1 > /proc/sys/vm/drop_caches



After:
$ free -m
             total       used       free     shared    buffers     cached
Mem:          7973       3663       4309          0         25        312
-/+ buffers/cache:       3325       4647
Swap:         2047         46       2001