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debug-revlog: details about non-ancestors delta-bases...
debug-revlog: details about non-ancestors delta-bases Deltas against a base that is not an ancestor of the revision that owns this delta are notable. For example, they introduce complexity during the bundling process as the base might not exist on the unbundling side. We detect them in `hg debugrevlog` and print information about them.
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test-sparse-revlog.t
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/ tests / test-sparse-revlog.t
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====================================
Test delta choice with sparse revlog
====================================
Sparse-revlog usually shows the most gain on Manifest. However, it is simpler
to general an appropriate file, so we test with a single file instead. The
goal is to observe intermediate snapshot being created.
We need a large enough file. Part of the content needs to be replaced
repeatedly while some of it changes rarely.
$ bundlepath="$TESTDIR/artifacts/cache/big-file-churn.hg"
$ expectedhash=`cat "$bundlepath".md5`
#if slow
$ if [ ! -f "$bundlepath" ]; then
> "$TESTDIR"/artifacts/scripts/generate-churning-bundle.py > /dev/null
> fi
#else
$ if [ ! -f "$bundlepath" ]; then
> echo 'skipped: missing artifact, run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
> exit 80
> fi
#endif
$ currenthash=`f -M "$bundlepath" | cut -d = -f 2`
$ if [ "$currenthash" != "$expectedhash" ]; then
> echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
> exit 80
> fi
$ cat >> $HGRCPATH << EOF
> [format]
> sparse-revlog = yes
> maxchainlen = 15
> [storage]
> revlog.optimize-delta-parent-choice = yes
> revlog.reuse-external-delta = no
> EOF
$ hg init sparse-repo
$ cd sparse-repo
$ hg unbundle $bundlepath
adding changesets
adding manifests
adding file changes
added 5001 changesets with 5001 changes to 1 files (+89 heads)
new changesets 9706f5af64f4:d9032adc8114 (5001 drafts)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updated to "d9032adc8114: commit #5000"
89 other heads for branch "default"
$ hg log --stat -r 0:3
changeset: 0:9706f5af64f4
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: initial commit
SPARSE-REVLOG-TEST-FILE | 10500 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 10500 insertions(+), 0 deletions(-)
changeset: 1:724907deaa5e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #1
SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
1 files changed, 534 insertions(+), 534 deletions(-)
changeset: 2:62c41bce3e5d
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #2
SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
1 files changed, 534 insertions(+), 534 deletions(-)
changeset: 3:348a9cbd6959
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #3
SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
1 files changed, 534 insertions(+), 534 deletions(-)
$ f -s .hg/store/data/*.d
.hg/store/data/_s_p_a_r_s_e-_r_e_v_l_o_g-_t_e_s_t-_f_i_l_e.d: size=58616973
$ hg debugrevlog *
format : 1
flags : generaldelta
revisions : 5001
merges : 625 (12.50%)
normal : 4376 (87.50%)
revisions : 5001
empty : 0 ( 0.00%)
text : 0 (100.00%)
delta : 0 (100.00%)
snapshot : 383 ( 7.66%)
lvl-0 : 3 ( 0.06%)
lvl-1 : 18 ( 0.36%) non-ancestor-bases: 9 (50.00%)
lvl-2 : 62 ( 1.24%) non-ancestor-bases: 58 (93.55%)
lvl-3 : 108 ( 2.16%) non-ancestor-bases: 108 (100.00%)
lvl-4 : 191 ( 3.82%) non-ancestor-bases: 180 (94.24%)
lvl-5 : 1 ( 0.02%) non-ancestor-bases: 1 (100.00%)
deltas : 4618 (92.34%)
revision size : 58616973
snapshot : 9247844 (15.78%)
lvl-0 : 539532 ( 0.92%)
lvl-1 : 1467743 ( 2.50%)
lvl-2 : 1873820 ( 3.20%)
lvl-3 : 2326874 ( 3.97%)
lvl-4 : 3029118 ( 5.17%)
lvl-5 : 10757 ( 0.02%)
deltas : 49369129 (84.22%)
chunks : 5001
0x28 : 5001 (100.00%)
chunks size : 58616973
0x28 : 58616973 (100.00%)
avg chain length : 9
max chain length : 15
max chain reach : 27366701
compression ratio : 29
uncompressed data size (min/max/avg) : 346468 / 346472 / 346471
full revision size (min/max/avg) : 179288 / 180786 / 179844
inter-snapshot size (min/max/avg) : 10757 / 169507 / 22916
level-1 (min/max/avg) : 13905 / 169507 / 81541
level-2 (min/max/avg) : 10887 / 83873 / 30222
level-3 (min/max/avg) : 10911 / 43047 / 21545
level-4 (min/max/avg) : 10838 / 21390 / 15859
level-5 (min/max/avg) : 10757 / 10757 / 10757
delta size (min/max/avg) : 9672 / 108072 / 10690
deltas against prev : 3906 (84.58%)
where prev = p1 : 3906 (100.00%)
where prev = p2 : 0 ( 0.00%)
other-ancestor : 0 ( 0.00%)
unrelated : 0 ( 0.00%)
deltas against p1 : 649 (14.05%)
deltas against p2 : 63 ( 1.36%)
deltas against ancs : 0 ( 0.00%)
deltas against other : 0 ( 0.00%)
Test `debug-delta-find`
-----------------------
$ ls -1
SPARSE-REVLOG-TEST-FILE
$ hg debugdeltachain SPARSE-REVLOG-TEST-FILE | grep snap | tail -1
4971 4970 -1 3 5 4930 snap 19179 346472 427596 1.23414 15994877 15567281 36.40652 427596 179288 1.00000 5
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971
DBG-DELTAS-SEARCH: SEARCH rev=4971
DBG-DELTAS-SEARCH: ROUND #1 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4962
DBG-DELTAS-SEARCH: type=snapshot-4
DBG-DELTAS-SEARCH: size=18296
DBG-DELTAS-SEARCH: base=4930
DBG-DELTAS-SEARCH: uncompressed-delta-size=30377
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=16872 (BAD)
DBG-DELTAS-SEARCH: ROUND #2 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
DBG-DELTAS-SEARCH: type=snapshot-3
DBG-DELTAS-SEARCH: size=39228
DBG-DELTAS-SEARCH: base=4799
DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
DBG-DELTAS-SEARCH: ROUND #3 - 1 candidates - refine-down
DBG-DELTAS-SEARCH: CONTENDER: rev=4930 - length=19179
DBG-DELTAS-SEARCH: CANDIDATE: rev=4799
DBG-DELTAS-SEARCH: type=snapshot-2
DBG-DELTAS-SEARCH: size=50213
DBG-DELTAS-SEARCH: base=4623
DBG-DELTAS-SEARCH: uncompressed-delta-size=82661
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=49132 (BAD)
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=0 - search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ cat << EOF >>.hg/hgrc
> [storage]
> revlog.optimize-delta-parent-choice = no
> revlog.reuse-external-delta = yes
> EOF
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971 --quiet
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=0 - search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971 --source full
DBG-DELTAS-SEARCH: SEARCH rev=4971
DBG-DELTAS-SEARCH: ROUND #1 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4962
DBG-DELTAS-SEARCH: type=snapshot-4
DBG-DELTAS-SEARCH: size=18296
DBG-DELTAS-SEARCH: base=4930
DBG-DELTAS-SEARCH: uncompressed-delta-size=30377
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=16872 (BAD)
DBG-DELTAS-SEARCH: ROUND #2 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
DBG-DELTAS-SEARCH: type=snapshot-3
DBG-DELTAS-SEARCH: size=39228
DBG-DELTAS-SEARCH: base=4799
DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
DBG-DELTAS-SEARCH: ROUND #3 - 1 candidates - refine-down
DBG-DELTAS-SEARCH: CONTENDER: rev=4930 - length=19179
DBG-DELTAS-SEARCH: CANDIDATE: rev=4799
DBG-DELTAS-SEARCH: type=snapshot-2
DBG-DELTAS-SEARCH: size=50213
DBG-DELTAS-SEARCH: base=4623
DBG-DELTAS-SEARCH: uncompressed-delta-size=82661
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=49132 (BAD)
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=0 - search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971 --source storage
DBG-DELTAS-SEARCH: SEARCH rev=4971
DBG-DELTAS-SEARCH: ROUND #1 - 1 candidates - cached-delta
DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
DBG-DELTAS-SEARCH: type=snapshot-3
DBG-DELTAS-SEARCH: size=39228
DBG-DELTAS-SEARCH: base=4799
DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=1 - search-rounds=1 try-count=1 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971 --source p1
DBG-DELTAS-SEARCH: SEARCH rev=4971
DBG-DELTAS-SEARCH: ROUND #1 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4962
DBG-DELTAS-SEARCH: type=snapshot-4
DBG-DELTAS-SEARCH: size=18296
DBG-DELTAS-SEARCH: base=4930
DBG-DELTAS-SEARCH: uncompressed-delta-size=30377
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=16872 (BAD)
DBG-DELTAS-SEARCH: ROUND #2 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
DBG-DELTAS-SEARCH: type=snapshot-3
DBG-DELTAS-SEARCH: size=39228
DBG-DELTAS-SEARCH: base=4799
DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
DBG-DELTAS-SEARCH: ROUND #3 - 1 candidates - refine-down
DBG-DELTAS-SEARCH: CONTENDER: rev=4930 - length=19179
DBG-DELTAS-SEARCH: CANDIDATE: rev=4799
DBG-DELTAS-SEARCH: type=snapshot-2
DBG-DELTAS-SEARCH: size=50213
DBG-DELTAS-SEARCH: base=4623
DBG-DELTAS-SEARCH: uncompressed-delta-size=82661
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=49132 (BAD)
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=0 - search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971 --source p2
DBG-DELTAS-SEARCH: SEARCH rev=4971
DBG-DELTAS-SEARCH: ROUND #1 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4962
DBG-DELTAS-SEARCH: type=snapshot-4
DBG-DELTAS-SEARCH: size=18296
DBG-DELTAS-SEARCH: base=4930
DBG-DELTAS-SEARCH: uncompressed-delta-size=30377
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=16872 (BAD)
DBG-DELTAS-SEARCH: ROUND #2 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
DBG-DELTAS-SEARCH: type=snapshot-3
DBG-DELTAS-SEARCH: size=39228
DBG-DELTAS-SEARCH: base=4799
DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
DBG-DELTAS-SEARCH: ROUND #3 - 1 candidates - refine-down
DBG-DELTAS-SEARCH: CONTENDER: rev=4930 - length=19179
DBG-DELTAS-SEARCH: CANDIDATE: rev=4799
DBG-DELTAS-SEARCH: type=snapshot-2
DBG-DELTAS-SEARCH: size=50213
DBG-DELTAS-SEARCH: base=4623
DBG-DELTAS-SEARCH: uncompressed-delta-size=82661
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=49132 (BAD)
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=0 - search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971 --source prev
DBG-DELTAS-SEARCH: SEARCH rev=4971
DBG-DELTAS-SEARCH: ROUND #1 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4962
DBG-DELTAS-SEARCH: type=snapshot-4
DBG-DELTAS-SEARCH: size=18296
DBG-DELTAS-SEARCH: base=4930
DBG-DELTAS-SEARCH: uncompressed-delta-size=30377
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=16872 (BAD)
DBG-DELTAS-SEARCH: ROUND #2 - 1 candidates - search-down
DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
DBG-DELTAS-SEARCH: type=snapshot-3
DBG-DELTAS-SEARCH: size=39228
DBG-DELTAS-SEARCH: base=4799
DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
DBG-DELTAS-SEARCH: ROUND #3 - 1 candidates - refine-down
DBG-DELTAS-SEARCH: CONTENDER: rev=4930 - length=19179
DBG-DELTAS-SEARCH: CANDIDATE: rev=4799
DBG-DELTAS-SEARCH: type=snapshot-2
DBG-DELTAS-SEARCH: size=50213
DBG-DELTAS-SEARCH: base=4623
DBG-DELTAS-SEARCH: uncompressed-delta-size=82661
DBG-DELTAS-SEARCH: delta-search-time=* (glob)
DBG-DELTAS-SEARCH: DELTA: length=49132 (BAD)
DBG-DELTAS: FILELOG:SPARSE-REVLOG-TEST-FILE: rev=4971: delta-base=4930 is-cached=0 - search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ cd ..