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                網站內存占用過多,手動釋放 1.輸入free -m查看內存使用情況 ``` total used free shared buffers cached Mem: 15944 772 15171 0 21 482 -/+ buffers/cache: 268 15675 Swap: 2015 0 2015 ``` 2.內容詳解 total 內存總數 used 已經使用的內存數 free 空閑的內存數 shared 多個進程共享的內存總額 buffers Buffer Cache和cached Page Cache 磁盤緩存的大小 \-buffers/cache (已用)的內存數:used - buffers - cached +buffers/cache(可用)的內存數:free + buffers + cached 可用的memory=free memory+buffers+cached 3.手動釋放 ``` # 先查看一下釋放cache信令值, 此時應該是0 $ cat /proc/sys/vm/drop_caches 0 # 將緩沖區寫入磁盤, 當需要停止系統的時候, 保證文件系統的完整性 $ sync # 釋放cache, 這個命令可能要花費一點時間, 請耐心等待 $ echo 3 > /proc/sys/vm/drop_caches # 再看一眼 $ cat /proc/sys/vm/drop_caches 3 #重新執行free -m,會發現已經釋放了 ```
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