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authorLibravatar Jeff King <peff@peff.net>2013-10-30 02:50:16 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2013-10-30 10:33:46 -0700
commitb74cf648036af764a176898763a0ec066a77a92f (patch)
treea5106f3db9eb220d882365d46f504c85b5be861b /fetch-pack.c
parentGit 1.8.4 (diff)
downloadtgif-b74cf648036af764a176898763a0ec066a77a92f.tar.xz
for-each-ref: avoid loading objects to print %(objectname)
If you ask for-each-ref to print each ref and its object, like: git for-each-ref --format='%(objectname) %(refname)' this should involve little more work than looking at the ref files (and packed-refs) themselves. However, for-each-ref will actually load each object from disk just to print its sha1. For most repositories, this isn't a big deal, but it can be noticeable if you have a large number of refs to print. Here are best-of-five timings for the command above on a repo with ~10K refs: [before] real 0m0.112s user 0m0.092s sys 0m0.016s [after] real 0m0.014s user 0m0.012s sys 0m0.000s This patch checks for %(objectname) and %(objectname:short) before we actually parse the object (and the rest of the code is smart enough to avoid parsing if we have filled all of our placeholders). Note that we can't simply move the objectname parsing code into the early loop. If the "deref" form %(*objectname) is used, then we do need to parse the object in order to peel the tag. So instead of moving the code, we factor it out into a separate function that can be called for both cases. While we're at it, we add some basic tests for the dereferenced placeholders, which were not tested at all before. This helps ensure we didn't regress that case. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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