Linux/ページキャッシュ

• Linux のページキャッシュ
• ページキャッシュをクリア
  • Linux Memory Cache クリア
  • man proc

ページキャッシュのクリア †

• Linuxのページキャッシュをきれいさっぱり消すには？
  • sync;sync;sync;
  • echo 1 > /proc/sys/vm/drop_caches

[root@svr01 work]# free -m
             total       used       free     shared    buffers     cached
Mem:         72432       3604      68828          0          1         65
-/+ buffers/cache:       3538      68894
Swap:        80003          0      80003
[root@svr01 work]# sync;sync;sync;
[root@svr01 work]# echo 1 > /proc/sys/vm/drop_caches
[root@svr01 work]# free -m
             total       used       free     shared    buffers     cached
Mem:         72432       3570      68861          0          0         31
-/+ buffers/cache:       3538      68894
Swap:        80003          0      80003

/proc/meminfo †

• proc/meminfo の差分

$ cat /proc/meminfo

MemTotal:      2074860 kB
MemFree:        620240 kB
Buffers:         55196 kB
Cached:        1261444 kB
SwapCached:          0 kB
Active:        1099992 kB
Inactive:       274356 kB
HighTotal:     1179520 kB
HighFree:       401280 kB
LowTotal:       895340 kB
LowFree:        218960 kB
SwapTotal:     2031608 kB
SwapFree:      2031476 kB
Dirty:               8 kB
Writeback:           0 kB
Mapped:          74072 kB
Slab:            62872 kB
CommitLimit:   3069036 kB
Committed_AS:   288472 kB
PageTables:       3448 kB
VmallocTotal:   106488 kB
VmallocUsed:      3024 kB
VmallocChunk:   103328 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB