禁用特定程序的RAM内存缓存

Question

禁用特定程序的RAM内存缓存

ramcache

3

我正在运行一些基于C语言编译的二进制文件进行基准测试。有没有办法让内核不缓存这些二进制程序的任何部分？

- Alex Jones

1个回答

- popey · Accepted Answer

请查看有关"drop_caches"的内核文档。

https://www.kernel.org/doc/Documentation/sysctl/vm.txt

这是一个小节：

Writing to this will cause the kernel to drop clean caches, as well as
reclaimable slab objects like dentries and inodes.  Once dropped, their
memory becomes free.

To free pagecache:
    echo 1 > /proc/sys/vm/drop_caches
To free reclaimable slab objects (includes dentries and inodes):
    echo 2 > /proc/sys/vm/drop_caches
To free slab objects and pagecache:
    echo 3 > /proc/sys/vm/drop_caches

This is a non-destructive operation and will not free any dirty objects.
To increase the number of objects freed by this operation, the user may run
`sync' prior to writing to /proc/sys/vm/drop_caches.  This will minimize the
number of dirty objects on the system and create more candidates to be
dropped.