From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff King <peff@peff.net>
Subject: Re: git status: small difference between stating whole repository
 and small subdirectory
Date: Mon, 20 Feb 2012 09:06:53 -0500
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Cc: Junio C Hamano <gitster@pobox.com>,
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To: Piotr Krukowiecki <piotr.krukowiecki@gmail.com>
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On Mon, Feb 20, 2012 at 09:25:00AM +0100, Piotr Krukowiecki wrote:

> Is the cache set? Not sure how to check it. t0090-cache-tree.sh uses
> test-dump-cache-tree and executes "read-tree HEAD" to establish the
> cache, but in my case read-tree does not make the cache dumpable (but
> it improves status performance).
> 
> $ test-dump-cache-tree  | wc -l
> 0
> $ git read-tree HEAD
> $ test-dump-cache-tree  | wc -l
> 0
> $ echo 3 | sudo tee /proc/sys/vm/drop_caches && time git status -- .
> [...]
> real	0m1.085s

Hmm. I would think test-dump-cache-tree would do it. I don't know why
read-tree wouldn't fill it in, though.

Interestingly, on my git.git repo, I had an empty cache. Running "git
read-tree HEAD" filled it (according to test-dump-cache-tree). It seems
that running "git checkout" empties the cache.  So perhaps git could do
better about keeping the cache valid over time.

-Peff