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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 echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'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%)
lvl-2 : 62 ( 1.24%)
lvl-3 : 108 ( 2.16%)
lvl-4 : 191 ( 3.82%)
lvl-5 : 1 ( 0.02%)
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 : 0 ( 0.00%)
deltas against p1 : 649 (14.05%)
deltas against p2 : 63 ( 1.36%)
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 - 2 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: CANDIDATE: rev=4971
DBG-DELTAS-SEARCH: type=snapshot-4
DBG-DELTAS-SEARCH: size=19179
DBG-DELTAS-SEARCH: base=4930
DBG-DELTAS-SEARCH: TOO-HIGH
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: search-rounds=3 try-count=3 - delta-type=snapshot snap-depth=4 - p1-chain-length=15 p2-chain-length=-1 - duration=* (glob)
$ cd ..
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