From: Jeff King <peff@peff.net>
To: Derrick Stolee <stolee@gmail.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 3/6] t/perf: add infrastructure for measuring sizes
Date: Wed, 22 Aug 2018 11:31:04 -0400 [thread overview]
Message-ID: <20180822153104.GE32630@sigill.intra.peff.net> (raw)
In-Reply-To: <b071f6a2-2403-0bbb-72a5-695f8c4e724d@gmail.com>
On Wed, Aug 22, 2018 at 09:40:55AM -0400, Derrick Stolee wrote:
> On 8/21/2018 3:06 PM, Jeff King wrote:
> > The main objective of scripts in the perf framework is to
> > run "test_perf", which measures the time it takes to run
> > some operation. However, it can also be interesting to see
> > the change in the output size of certain operations.
> >
> > This patch introduces test_size, which records a single
> > numeric output from the test and shows it in the aggregated
> > output (with pretty printing and relative size comparison).
>
> I'm interested in exploring this test_size mechanism. The other area that
> could benefit from size testing is 'git repack', but I don't have any plans
> to change our compression or delta strategies. If we _did_ look into that,
> then using test_size would be a natural fit.
Yeah, I agree it would be a good tool for showing off improvements
there.
It may also be useful for catching regressions in topics that are trying
to speed things up, but _don't_ intend to change the size. We could even
do that proactively now. I.e., something like:
test_perf 'repack' 'git repack -adf'
test_size 'pack size' 'wc -c <.git/objects/pack/*.pack'
just to see if it ever changes. But I suspect its usefulness may depend
on how you are packing (e.g., is "-f" more likely to catch issues than
without?).
The new tests I added in this series cover packs created for fetches.
There's no guarantee that will overlap with the behavior of an on-disk
repack, but at least we have some generic coverage of pack-objects
output sizes now. Absent any suspicion of a regression for a particular
case, that's probably an acceptable canary in the coal mine.
-Peff
next prev parent reply other threads:[~2018-08-22 15:31 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-21 18:41 [PATCH] test-tool.h: include git-compat-util.h Jeff King
2018-08-21 19:03 ` Junio C Hamano
2018-08-21 19:06 ` [PATCH 1/6] t/perf: factor boilerplate out of test_perf Jeff King
2018-08-21 19:06 ` [PATCH 2/6] t/perf: factor out percent calculations Jeff King
2018-08-21 19:06 ` [PATCH 3/6] t/perf: add infrastructure for measuring sizes Jeff King
2018-08-22 13:40 ` Derrick Stolee
2018-08-22 15:31 ` Jeff King [this message]
2018-08-21 19:06 ` [PATCH 4/6] t/perf: add perf tests for fetches from a bitmapped server Jeff King
2018-08-21 19:07 ` [PATCH 5/6] pack-bitmap: save "have" bitmap from walk Jeff King
2018-08-21 19:47 ` Derrick Stolee
2018-08-21 19:54 ` Jeff King
2018-08-31 15:23 ` Ævar Arnfjörð Bjarmason
2018-08-31 22:55 ` Jeff King
2018-09-01 7:41 ` [PATCH 0/4] un-breaking pack-objects with bitmaps Jeff King
2018-09-01 7:44 ` [PATCH 1/4] bitmap_has_sha1_in_uninteresting(): drop BUG check Jeff King
2018-09-01 7:48 ` [PATCH 2/4] t5310: test delta reuse with bitmaps Jeff King
2018-09-01 8:03 ` Jeff King
2018-09-01 20:29 ` Ævar Arnfjörð Bjarmason
2018-09-01 22:46 ` Ben Peart
2018-09-02 5:51 ` Jeff King
2018-09-04 19:05 ` Stefan Beller
2018-09-04 19:45 ` Junio C Hamano
2018-09-04 20:02 ` Jeff King
2018-09-01 7:49 ` [PATCH 3/4] traverse_bitmap_commit_list(): don't free result Jeff King
2018-09-01 7:50 ` [PATCH 4/4] pack-bitmap: drop "loaded" flag Jeff King
2018-09-04 19:30 ` [PATCH 0/4] un-breaking pack-objects with bitmaps Stefan Beller
2018-09-04 20:03 ` Jeff King
2018-09-08 6:43 ` Ævar Arnfjörð Bjarmason
2018-09-10 16:53 ` Junio C Hamano
2018-09-10 18:48 ` Jeff King
2018-09-10 19:23 ` Junio C Hamano
2018-08-21 19:07 ` [PATCH 6/6] pack-objects: reuse on-disk deltas for thin "have" objects Jeff King
2018-08-21 19:43 ` Junio C Hamano
2018-08-21 19:50 ` Junio C Hamano
2018-08-21 20:07 ` Jeff King
2018-08-21 20:14 ` Jeff King
2018-08-21 20:52 ` Junio C Hamano
2018-08-21 21:30 ` Jeff King
2018-08-21 20:57 ` Junio C Hamano
2018-08-21 21:32 ` Jeff King
2018-08-23 0:43 ` [PATCH 0/9] trailer-parsing false positives Jeff King
2018-08-23 0:44 ` [PATCH 1/9] trailer: use size_t for string offsets Jeff King
2018-08-23 0:45 ` [PATCH 2/9] trailer: use size_t for iterating trailer list Jeff King
2018-08-23 0:46 ` [PATCH 3/9] trailer: pass process_trailer_opts to trailer_info_get() Jeff King
2018-08-23 0:48 ` [PATCH 4/9] interpret-trailers: tighten check for "---" patch boundary Jeff King
2018-08-23 0:49 ` [PATCH 5/9] interpret-trailers: allow suppressing "---" divider Jeff King
2018-08-23 0:50 ` [PATCH 6/9] pretty, ref-filter: format %(trailers) with no_divider option Jeff King
2018-08-23 0:50 ` [PATCH 7/9] sequencer: ignore "---" divider when parsing trailers Jeff King
2018-08-23 0:50 ` [PATCH 8/9] append_signoff: use size_t for string offsets Jeff King
2018-08-23 0:51 ` [PATCH 9/9] sequencer: handle ignore_footer when parsing trailers Jeff King
2018-08-23 18:30 ` [PATCH 0/9] trailer-parsing false positives Junio C Hamano
2018-08-24 7:26 ` Jeff King
2018-08-21 20:00 ` [PATCH 6/6] pack-objects: reuse on-disk deltas for thin "have" objects Jeff King
-- strict thread matches above, loose matches on Subject: below --
2018-08-17 20:54 [PATCH 0/6] reuse on-disk deltas for fetches with bitmaps Jeff King
2018-08-17 20:56 ` [PATCH 3/6] t/perf: add infrastructure for measuring sizes Jeff King
2014-03-26 7:22 [PATCH/RFC 0/6] reuse deltas found by bitmaps Jeff King
2014-03-26 7:22 ` [PATCH 3/6] t/perf: add infrastructure for measuring sizes Jeff King
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