====================================
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 [ ! -f "$bundlepath" ]; then
> echo 'skipped: missing artifact, run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
> exit 80
> fi
$ 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 echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'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
> 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=63002924
$ 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 : 374 ( 7.48%)
lvl-0 : 4 ( 0.08%)
lvl-1 : 23 ( 0.46%)
lvl-2 : 63 ( 1.26%)
lvl-3 : 118 ( 2.36%)
lvl-4 : 166 ( 3.32%)
deltas : 4627 (92.52%)
revision size : 63002924
snapshot : 9888099 (15.69%)
lvl-0 : 804262 ( 1.28%)
lvl-1 : 1561380 ( 2.48%)
lvl-2 : 2096696 ( 3.33%)
lvl-3 : 2749539 ( 4.36%)
lvl-4 : 2676222 ( 4.25%)
deltas : 53114825 (84.31%)
chunks : 5001
0x78 (x) : 5001 (100.00%)
chunks size : 63002924
0x78 (x) : 63002924 (100.00%)
avg chain length : 9
max chain length : 15
max chain reach : 28907121
compression ratio : 27
uncompressed data size (min/max/avg) : 346468 / 346472 / 346471
full revision size (min/max/avg) : 201008 / 201141 / 201065
inter-snapshot size (min/max/avg) : 11601 / 157413 / 24550
level-1 (min/max/avg) : 13061 / 157413 / 67886
level-2 (min/max/avg) : 11674 / 85631 / 33280
level-3 (min/max/avg) : 11602 / 42957 / 23301
level-4 (min/max/avg) : 11601 / 21475 / 16121
delta size (min/max/avg) : 10649 / 105465 / 11479
deltas against prev : 3966 (85.71%)
where prev = p1 : 3922 (98.89%)
where prev = p2 : 0 ( 0.00%)
other : 44 ( 1.11%)
deltas against p1 : 611 (13.21%)
deltas against p2 : 50 ( 1.08%)
deltas against other : 0 ( 0.00%)