Previously, memory use looks good. And I use mysql> load data infile
'file' into table to import a very large mysql data file. So the
memory used became large quickly and soon exhaust all the memory to
use swap space. After that the system became slow for cpu fully
waiting IO status. (Why mysql or system do not automatic free some of
the loaded data from memory, Just use a little swap space to sawp out
a little memory). After a long time, the mysql load process complete
and I restart the mysqld daemon, but the memory does still hold large
memory.
Why linux does not release the memory again ? Is there any way that I
can free the memory without reboot machine?
Thanks....
shell# free
total used free shared buffers cached
Mem: 516488 459376 57112 0 8 420152
-/+ buffers/cache: 39216 477272
Swap: 1023992 80 1023912
top - 11:20:56 up 46 min, 1 user, load average: 0.00, 0.00, 0.11
Tasks: 50 total, 1 running, 49 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 516488k total, 459316k used, 57172k free, 8k buffers
Swap: 1023992k total, 80k used, 1023912k free, 420084k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4002 root 16 0 2228 1124 868 R 0.3 0.2 0:00.02 top
1 root 16 0 1940 660 564 S 0.0 0.1 0:01.28 init
2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
4 root 10 -5 0 0 0 S 0.0 0.0 0:00.02 events/0
5 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 khelper
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