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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 "$bundlepath".md5`
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#if slow
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$ if [ ! -f "$bundlepath" ]; then
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> "$TESTDIR"/artifacts/scripts/generate-churning-bundle.py > /dev/null
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> fi
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#else
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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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#endif
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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 echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'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 >> $HGRCPATH << EOF
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> [format]
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> sparse-revlog = yes
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> maxchainlen = 15
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> [storage]
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> revlog.optimize-delta-parent-choice = yes
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> revlog.reuse-external-delta = no
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> EOF
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$ 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=58616973
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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 : 383 ( 7.66%)
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lvl-0 : 3 ( 0.06%)
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lvl-1 : 18 ( 0.36%)
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lvl-2 : 62 ( 1.24%)
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lvl-3 : 108 ( 2.16%)
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lvl-4 : 191 ( 3.82%)
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lvl-5 : 1 ( 0.02%)
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deltas : 4618 (92.34%)
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revision size : 58616973
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snapshot : 9247844 (15.78%)
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lvl-0 : 539532 ( 0.92%)
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lvl-1 : 1467743 ( 2.50%)
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lvl-2 : 1873820 ( 3.20%)
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lvl-3 : 2326874 ( 3.97%)
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lvl-4 : 3029118 ( 5.17%)
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lvl-5 : 10757 ( 0.02%)
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deltas : 49369129 (84.22%)
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chunks : 5001
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0x28 : 5001 (100.00%)
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chunks size : 58616973
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0x28 : 58616973 (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 : 27366701
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compression ratio : 29
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uncompressed data size (min/max/avg) : 346468 / 346472 / 346471
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full revision size (min/max/avg) : 179288 / 180786 / 179844
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inter-snapshot size (min/max/avg) : 10757 / 169507 / 22916
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level-1 (min/max/avg) : 13905 / 169507 / 81541
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level-2 (min/max/avg) : 10887 / 83873 / 30222
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level-3 (min/max/avg) : 10911 / 43047 / 21545
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level-4 (min/max/avg) : 10838 / 21390 / 15859
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level-5 (min/max/avg) : 10757 / 10757 / 10757
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delta size (min/max/avg) : 9672 / 108072 / 10690
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deltas against prev : 3906 (84.58%)
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where prev = p1 : 3906 (100.00%)
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where prev = p2 : 0 ( 0.00%)
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other : 0 ( 0.00%)
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deltas against p1 : 649 (14.05%)
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deltas against p2 : 63 ( 1.36%)
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deltas against other : 0 ( 0.00%)
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Test `debug-delta-find`
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-----------------------
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$ ls -1
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SPARSE-REVLOG-TEST-FILE
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$ hg debugdeltachain SPARSE-REVLOG-TEST-FILE | grep snap | tail -1
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4971 4970 -1 3 5 4930 snap 19179 346472 427596 1.23414 15994877 15567281 36.40652 427596 179288 1.00000 5
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$ hg debug-delta-find SPARSE-REVLOG-TEST-FILE 4971
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DBG-DELTAS-SEARCH: SEARCH rev=4971
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DBG-DELTAS-SEARCH: ROUND #1 - 2 candidates - search-down
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DBG-DELTAS-SEARCH: CANDIDATE: rev=4962
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DBG-DELTAS-SEARCH: type=snapshot-4
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DBG-DELTAS-SEARCH: size=18296
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DBG-DELTAS-SEARCH: base=4930
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DBG-DELTAS-SEARCH: uncompressed-delta-size=30377
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DBG-DELTAS-SEARCH: delta-search-time=* (glob)
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DBG-DELTAS-SEARCH: DELTA: length=16872 (BAD)
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DBG-DELTAS-SEARCH: CANDIDATE: rev=4971
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DBG-DELTAS-SEARCH: type=snapshot-4
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DBG-DELTAS-SEARCH: size=19179
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DBG-DELTAS-SEARCH: base=4930
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DBG-DELTAS-SEARCH: TOO-HIGH
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DBG-DELTAS-SEARCH: ROUND #2 - 1 candidates - search-down
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DBG-DELTAS-SEARCH: CANDIDATE: rev=4930
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DBG-DELTAS-SEARCH: type=snapshot-3
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DBG-DELTAS-SEARCH: size=39228
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DBG-DELTAS-SEARCH: base=4799
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DBG-DELTAS-SEARCH: uncompressed-delta-size=33050
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DBG-DELTAS-SEARCH: delta-search-time=* (glob)
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DBG-DELTAS-SEARCH: DELTA: length=19179 (GOOD)
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DBG-DELTAS-SEARCH: ROUND #3 - 1 candidates - refine-down
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DBG-DELTAS-SEARCH: CONTENDER: rev=4930 - length=19179
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DBG-DELTAS-SEARCH: CANDIDATE: rev=4799
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DBG-DELTAS-SEARCH: type=snapshot-2
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DBG-DELTAS-SEARCH: size=50213
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DBG-DELTAS-SEARCH: base=4623
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DBG-DELTAS-SEARCH: uncompressed-delta-size=82661
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DBG-DELTAS-SEARCH: delta-search-time=* (glob)
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DBG-DELTAS-SEARCH: DELTA: length=49132 (BAD)
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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)
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$ cd ..
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