centos6.2清除系统缓存的步骤
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>1、使用free – m命令查看内存使用情况<br>
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<span><u>复制代码</u></span>
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代码如下:</p>
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total used free shared buffers cached<br>
Mem: 3832 2716 1115 0 95 1483<br>
-/+ buffers/cache: 1137 2695<br>
Swap: 6015 0 6015</div>
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从上面可以看到内存中的缓存又1483M之多，幸亏我的内存是4G的，如果是2G就吃不消了</p>
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2、使用sync命令将存于 buffer 中的资料强制写入硬盘中</p>
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3、使用以下命令清除缓存，释放空间<br>
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<span><u>复制代码</u></span>
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代码如下:</p>
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echo 3 > /proc/sys/vm/drop_caches</div>
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4、再使用 free -m 命令查看内存使用情况<br>
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<span><u>复制代码</u></span>
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代码如下:</p>
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total used free shared buffers cached<br>
Mem: 3832 1176 2655 0 0 169<br>
-/+ buffers/cache: 1006 2825<br>
Swap: 6015 0 6015</div>
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好了，就上面的步骤就可以了，其实最终要的还是第三步，有时候在linux下看了电影或者下载了文件后缓存奇高，现在又办法解决了</p>
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