t/perf: avoid testing bitmaps without lookup table
In a previous commit, the setting which controls whether or not the
pack- and MIDX-bitmap machinery writes a lookup table,
'pack.writeBitmapLookupTable' was enabled by default.
As a result, we can clean up many of our bitmap-related performance
tests. Many of the relevant performance tests look something like:
test_it () {
test_expect_success 'setup pack.writeBitmapLookupTable' '
git config pack.writeBitmapLookupTable '"$1"'
'
# ...
}
test_it true
test_it false
, where the two invocations of 'test_it' run the tests with and without
bitmap lookup tables enabled.
But now that lookup tables are enabled by default and have proven to be
a performance win, let's avoid benchmarking what is now an uncommon and
non-default scenario.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
seen
Taylor Blau
Junio C Hamano
parent
8b0b5c7046
commit
c9d41a415f
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@ -4,37 +4,28 @@ test_description='Tests pack performance using bitmaps'
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. ./perf-lib.sh
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. "${TEST_DIRECTORY}/perf/lib-bitmap.sh"
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test_lookup_pack_bitmap () {
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test_expect_success 'start the test from scratch' '
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rm -rf * .git
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'
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test_expect_success 'start the test from scratch' '
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rm -rf * .git
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'
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test_perf_large_repo
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test_perf_large_repo
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# note that we do everything through config,
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# since we want to be able to compare bitmap-aware
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# git versus non-bitmap git
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#
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# We intentionally use the deprecated pack.writebitmaps
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# config so that we can test against older versions of git.
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test_expect_success 'setup bitmap config' '
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git config pack.writebitmaps true
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'
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# note that we do everything through config,
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# since we want to be able to compare bitmap-aware
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# git versus non-bitmap git
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#
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# We intentionally use the deprecated pack.writebitmaps
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# config so that we can test against older versions of git.
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test_expect_success 'setup bitmap config' '
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git config pack.writebitmaps true
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'
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# we need to create the tag up front such that it is covered by the repack and
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# thus by generated bitmaps.
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test_expect_success 'create tags' '
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git tag --message="tag pointing to HEAD" perf-tag HEAD
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'
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# we need to create the tag up front such that it is covered by the repack and
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# thus by generated bitmaps.
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test_expect_success 'create tags' '
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git tag --message="tag pointing to HEAD" perf-tag HEAD
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'
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test_perf "enable lookup table: $1" '
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git config pack.writeBitmapLookupTable '"$1"'
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'
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test_pack_bitmap
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}
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test_lookup_pack_bitmap false
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test_lookup_pack_bitmap true
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test_pack_bitmap
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test_done
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@ -3,52 +3,46 @@
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test_description='performance of fetches from bitmapped packs'
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. ./perf-lib.sh
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test_fetch_bitmaps () {
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test_expect_success 'setup test directory' '
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rm -fr * .git
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test_expect_success 'setup test directory' '
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rm -fr * .git
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'
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test_perf_default_repo
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test_expect_success 'create bitmapped server repo' '
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git config pack.writebitmaps true &&
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git repack -ad
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'
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# simulate a fetch from a repository that last fetched N days ago, for
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# various values of N. We do so by following the first-parent chain,
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# and assume the first entry in the chain that is N days older than the current
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# HEAD is where the HEAD would have been then.
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for days in 1 2 4 8 16 32 64 128; do
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title=$(printf '%10s' "($days days)")
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test_expect_success "setup revs from $days days ago" '
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now=$(git log -1 --format=%ct HEAD) &&
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then=$(($now - ($days * 86400))) &&
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tip=$(git rev-list -1 --first-parent --until=$then HEAD) &&
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{
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echo HEAD &&
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echo ^$tip
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} >revs
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'
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test_perf_default_repo
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test_expect_success 'create bitmapped server repo' '
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git config pack.writebitmaps true &&
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git config pack.writeBitmapLookupTable '"$1"' &&
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git repack -ad
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test_perf "server $title" '
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git pack-objects --stdout --revs \
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--thin --delta-base-offset \
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<revs >tmp.pack
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'
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# simulate a fetch from a repository that last fetched N days ago, for
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# various values of N. We do so by following the first-parent chain,
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# and assume the first entry in the chain that is N days older than the current
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# HEAD is where the HEAD would have been then.
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for days in 1 2 4 8 16 32 64 128; do
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title=$(printf '%10s' "($days days)")
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test_expect_success "setup revs from $days days ago" '
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now=$(git log -1 --format=%ct HEAD) &&
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then=$(($now - ($days * 86400))) &&
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tip=$(git rev-list -1 --first-parent --until=$then HEAD) &&
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{
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echo HEAD &&
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echo ^$tip
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} >revs
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'
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test_size "size $title" '
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test_file_size tmp.pack
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'
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test_perf "server $title (lookup=$1)" '
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git pack-objects --stdout --revs \
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--thin --delta-base-offset \
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<revs >tmp.pack
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'
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test_size "size $title" '
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test_file_size tmp.pack
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'
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test_perf "client $title (lookup=$1)" '
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git index-pack --stdin --fix-thin <tmp.pack
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'
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done
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}
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test_fetch_bitmaps true
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test_fetch_bitmaps false
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test_perf "client $title" '
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git index-pack --stdin --fix-thin <tmp.pack
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'
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done
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test_done
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@ -4,64 +4,53 @@ test_description='Tests performance using midx bitmaps'
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. ./perf-lib.sh
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. "${TEST_DIRECTORY}/perf/lib-bitmap.sh"
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test_bitmap () {
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local enabled="$1"
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test_expect_success "remove existing repo" '
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rm -fr * .git
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'
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test_expect_success "remove existing repo (lookup=$enabled)" '
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rm -fr * .git
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'
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test_perf_large_repo
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test_perf_large_repo
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# we need to create the tag up front such that it is covered by the repack and
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# thus by generated bitmaps.
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test_expect_success 'create tags' '
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git tag --message="tag pointing to HEAD" perf-tag HEAD
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'
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# we need to create the tag up front such that it is covered by the repack and
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# thus by generated bitmaps.
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test_expect_success 'create tags' '
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git tag --message="tag pointing to HEAD" perf-tag HEAD
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'
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test_expect_success "start with bitmapped pack" '
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git repack -adb
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'
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test_expect_success "use lookup table: $enabled" '
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git config pack.writeBitmapLookupTable '"$enabled"'
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'
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test_perf "setup multi-pack index" '
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git multi-pack-index write --bitmap
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'
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test_expect_success "start with bitmapped pack (lookup=$enabled)" '
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git repack -adb
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'
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test_expect_success "drop pack bitmap" '
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rm -f .git/objects/pack/pack-*.bitmap
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'
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test_perf "setup multi-pack index (lookup=$enabled)" '
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git multi-pack-index write --bitmap
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'
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test_full_bitmap
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test_expect_success "drop pack bitmap (lookup=$enabled)" '
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rm -f .git/objects/pack/pack-*.bitmap
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'
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test_expect_success "create partial bitmap state" '
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# pick a commit to represent the repo tip in the past
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cutoff=$(git rev-list HEAD~100 -1) &&
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orig_tip=$(git rev-parse HEAD) &&
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test_full_bitmap
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# now pretend we have just one tip
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rm -rf .git/logs .git/refs/* .git/packed-refs &&
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git update-ref HEAD $cutoff &&
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test_expect_success "create partial bitmap state (lookup=$enabled)" '
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# pick a commit to represent the repo tip in the past
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cutoff=$(git rev-list HEAD~100 -1) &&
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orig_tip=$(git rev-parse HEAD) &&
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# and then repack, which will leave us with a nice
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# big bitmap pack of the "old" history, and all of
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# the new history will be loose, as if it had been pushed
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# up incrementally and exploded via unpack-objects
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git repack -Ad &&
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git multi-pack-index write --bitmap &&
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# now pretend we have just one tip
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rm -rf .git/logs .git/refs/* .git/packed-refs &&
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git update-ref HEAD $cutoff &&
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# and now restore our original tip, as if the pushes
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# had happened
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git update-ref HEAD $orig_tip
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'
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# and then repack, which will leave us with a nice
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# big bitmap pack of the "old" history, and all of
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# the new history will be loose, as if it had been pushed
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# up incrementally and exploded via unpack-objects
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git repack -Ad &&
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git multi-pack-index write --bitmap &&
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# and now restore our original tip, as if the pushes
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# had happened
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git update-ref HEAD $orig_tip
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'
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test_partial_bitmap
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}
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test_bitmap false
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test_bitmap true
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test_partial_bitmap
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test_done
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@ -11,7 +11,6 @@ test_expect_success 'setup' '
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-c bitmapPseudoMerge.all.threshold=now \
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-c bitmapPseudoMerge.all.stableThreshold=never \
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-c bitmapPseudoMerge.all.maxMerges=64 \
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-c pack.writeBitmapLookupTable=true \
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repack -adb
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'
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