本文记录了一次在Linux环境下尝试清除系统缓存的过程。通过使用`/proc/sys/vm/drop_caches`命令来释放缓存，展示了普通用户与root权限下的不同结果，并对比了释放前后系统的内存使用情况。
dspeak@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar$ cat /proc/sys/vm/drop_caches
3
dspeak@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar$
dspeak@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar$ echo 3 > /proc/sys/vm/drop_caches
-bash: /proc/sys/vm/drop_caches: Permission denied
dspeak@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar$ free -m
total used free shared buffers cached
Mem: 1011 626 385 0 88 444
-/+ buffers/cache: 92 918
Swap: 1357 2 1354
dspeak@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar$ sudo -s
[sudo] password for dspeak:
Sorry, try again.
[sudo] password for dspeak:
root@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar# free -m
total used free shared buffers cached
Mem: 1011 627 383 0 88 444
-/+ buffers/cache: 94 916
Swap: 1357 2 1354
root@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar# echo 3 > /proc/sys/vm/drop_caches
root@lm-vm01:~/luowl/soft/lucene-3.0.1/demo-jar# free -m
total used free shared buffers cached
Mem: 1011 29 981 0 0 4
-/+ buffers/cache: 25 985
Swap: 1357 2 1354
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