Linux 如何重置mongodb缓存
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how to reset mongodb cache
提问by Oleg
Could you please tell how to reset mongodb cache to make sure that results of query are not from cache? Now I try to do it rebooting server: sudo reboot. Is there any other way? Thank you.
你能告诉我如何重置mongodb缓存以确保查询结果不是来自缓存吗？现在我尝试重新启动服务器：sudo reboot。有没有其他办法？谢谢你。
回答by AdaTheDev
MongoDB itself doesn't handle the caching. Instead, it's taken care of by the OS's virtual memory manager, as MongoDB uses Memory Mapped files. See: Mongodb.org
MongoDB 本身不处理缓存。相反，它由操作系统的虚拟内存管理器负责，因为 MongoDB 使用内存映射文件。参见：Mongodb.org
I'm no Linux guru, but for dev purposes when I wanted to ensure a completely clean cache, I did a reboot as that seemed to be what made the difference.
我不是 Linux 专家，但出于开发目的，当我想确保完全干净的缓存时，我进行了重新启动，因为这似乎是造成差异的原因。
I'm assuming you want to do this for dev/performance testing reasons rather than for production purposes too...
我假设您出于开发/性能测试的原因而不是出于生产目的也想这样做......
Update:
Check out this link: http://www.linuxask.com/questions/how-to-clear-cache-from-memory-in-linux
更新：
查看此链接：http: //www.linuxask.com/questions/how-to-clear-cache-from-memory-in-linux
回答by Taha Jahangir
Following user366534's comment, do this:
按照 user366534 的评论，执行以下操作：
- stop mongod
- sh -c "sync; echo 3 > /proc/sys/vm/drop_caches"
- start mongod
- 停止 mongod
- sh -c "sync; echo 3 > /proc/sys/vm/drop_caches"
- 启动mongod
