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[bash] メモリクリアコマンド

1月 192012

Linuxのメモリのうちbuffersとcachedをクリアするコマンド。

for i in 3 2 1; do free -lk ; sync ; sync ; sync ; sudo /sbin/sysctl -w vm.drop_caches=$i ; done

結果はこんな感じ。

$ for i in 3 2 1; do free -lk ; sync ; sync ; sync ; sudo /sbin/sysctl -w vm.drop_caches=$i ; done                                                          total       used       free     shared    buffers     cached
Mem:       8168944    5032404    3136540          0     326288     466392
Low:       8168944    5032404    3136540
High:            0          0          0
-/+ buffers/cache:    4239724    3929220
Swap:      1048568          0    1048568
vm.drop_caches = 3
             total       used       free     shared    buffers     cached
Mem:       8168944    4027040    4141904          0       1040      14372
Low:       8168944    4027040    4141904
High:            0          0          0
-/+ buffers/cache:    4011628    4157316
Swap:      1048568          0    1048568
vm.drop_caches = 2
             total       used       free     shared    buffers     cached
Mem:       8168944    4026756    4142188          0       1228      15704
Low:       8168944    4026756    4142188
High:            0          0          0
-/+ buffers/cache:    4009824    4159120
Swap:      1048568          0    1048568