如何禁止linux文件系统缓存
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http://www.linuxquestions.org/questions/linux-kernel-70/how-to-disable-filesystem-cache-627012/
Well, preventing read cache usage is pretty simple. You can do some raw-read tests with dd. You can also do some tests (one-time read only, unfortunately, using drop_caches):
Code:
drop_caches ----------- Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free. To free pagecache: echo 1 > /proc/sys/vm/drop_caches To free dentries and inodes: echo 2 > /proc/sys/vm/drop_caches To free pagecache, dentries and inodes: echo 3 > /proc/sys/vm/drop_caches As this is a non-destructive operation and dirty objects are not freeable, the user should run `sync' first.
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