On Fri, 24 Oct 2008, Jeff King wrote:
quoted text
> 
> Side note: on Linux, it is much easier to clear the cache via
> 
>   echo 1 >/proc/sys/vm/drop_caches

Use "echo 3" instead of "1".

It's actually a bitmask, with bit 0 being "data" (pagecache) and bit 1 
being "metadata" (inodes and directory caches).

And since git (or any SCM) is very metadata-intensive, you really should 
make sure to drop metadata too, otherwise your caches won't be really very 
cold at all.

(But it obviously depends on the operation you're testing - some are more 
about the inodes and directories, others are about file data access).

			Linus
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