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====================================
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Test delta choice with sparse revlog
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====================================
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Sparse-revlog usually shows the most gain on Manifest. However, it is simpler
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to general an appropriate file, so we test with a single file instead. The
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goal is to observe intermediate snapshot being created.
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We need a large enough file. Part of the content needs to be replaced
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repeatedly while some of it changes rarely.
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$ bundlepath="$TESTDIR/artifacts/cache/big-file-churn.hg"
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$ expectedhash=`cat "$bundlepath".md5`
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$ if [ ! -f "$bundlepath" ]; then
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> echo 'skipped: missing artifact, run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
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> exit 80
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> fi
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$ currenthash=`f -M "$bundlepath" | cut -d = -f 2`
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$ if [ "$currenthash" != "$expectedhash" ]; then
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> echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'
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> exit 80
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> fi
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$ cat >> $HGRCPATH << EOF
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> [format]
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> sparse-revlog = yes
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> maxchainlen = 15
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> [storage]
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> revlog.optimize-delta-parent-choice = yes
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> EOF
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$ hg init sparse-repo
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$ cd sparse-repo
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$ hg unbundle $bundlepath
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adding changesets
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adding manifests
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adding file changes
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added 5001 changesets with 5001 changes to 1 files (+89 heads)
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new changesets 9706f5af64f4:d9032adc8114 (5001 drafts)
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(run 'hg heads' to see heads, 'hg merge' to merge)
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$ hg up
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1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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updated to "d9032adc8114: commit #5000"
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89 other heads for branch "default"
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$ hg log --stat -r 0:3
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changeset: 0:9706f5af64f4
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: initial commit
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SPARSE-REVLOG-TEST-FILE | 10500 ++++++++++++++++++++++++++++++++++++++++++++++
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1 files changed, 10500 insertions(+), 0 deletions(-)
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changeset: 1:724907deaa5e
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: commit #1
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SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
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1 files changed, 534 insertions(+), 534 deletions(-)
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changeset: 2:62c41bce3e5d
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: commit #2
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SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
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1 files changed, 534 insertions(+), 534 deletions(-)
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changeset: 3:348a9cbd6959
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: commit #3
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SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++-----------------------
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1 files changed, 534 insertions(+), 534 deletions(-)
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$ f -s .hg/store/data/*.d
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.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
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$ hg debugrevlog *
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format : 1
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flags : generaldelta
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revisions : 5001
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merges : 625 (12.50%)
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normal : 4376 (87.50%)
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revisions : 5001
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empty : 0 ( 0.00%)
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text : 0 (100.00%)
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delta : 0 (100.00%)
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snapshot : 374 ( 7.48%)
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lvl-0 : 4 ( 0.08%)
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lvl-1 : 23 ( 0.46%)
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lvl-2 : 63 ( 1.26%)
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lvl-3 : 118 ( 2.36%)
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lvl-4 : 166 ( 3.32%)
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deltas : 4627 (92.52%)
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revision size : 63002924
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snapshot : 9888099 (15.69%)
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lvl-0 : 804262 ( 1.28%)
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lvl-1 : 1561380 ( 2.48%)
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lvl-2 : 2096696 ( 3.33%)
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lvl-3 : 2749539 ( 4.36%)
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lvl-4 : 2676222 ( 4.25%)
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deltas : 53114825 (84.31%)
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chunks : 5001
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0x78 (x) : 5001 (100.00%)
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chunks size : 63002924
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0x78 (x) : 63002924 (100.00%)
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avg chain length : 9
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max chain length : 15
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max chain reach : 28907121
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compression ratio : 27
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uncompressed data size (min/max/avg) : 346468 / 346472 / 346471
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full revision size (min/max/avg) : 201008 / 201141 / 201065
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inter-snapshot size (min/max/avg) : 11601 / 157413 / 24550
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level-1 (min/max/avg) : 13061 / 157413 / 67886
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level-2 (min/max/avg) : 11674 / 85631 / 33280
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level-3 (min/max/avg) : 11602 / 42957 / 23301
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level-4 (min/max/avg) : 11601 / 21475 / 16121
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delta size (min/max/avg) : 10649 / 105465 / 11479
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deltas against prev : 3966 (85.71%)
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where prev = p1 : 3922 (98.89%)
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where prev = p2 : 0 ( 0.00%)
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other : 44 ( 1.11%)
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deltas against p1 : 611 (13.21%)
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deltas against p2 : 50 ( 1.08%)
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deltas against other : 0 ( 0.00%)
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