From: Thomas Rast <trast@inf.ethz.ch>
Date: Mon, 20 Feb 2012 14:09:57 GMT
Subject: Re: git status: small difference between stating whole repository and small subdirectory
Message-ID: <87ty2l38ay.fsf@thomas.inf.ethz.ch>
In-Reply-To: <20120220140653.GC5131@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

> 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.

test_expect_failure 'checkout gives cache-tree' '
	git checkout HEAD^ &&
	test_shallow_cache_tree
'

;-)

-- 
Thomas Rast
trast@{inf,student}.ethz.ch