upstream/mercurial-mirror Files · tests/test-sparse-revlog.t

sparse-revlog: add a test checking revlog deltas for a churning file...

sparse-revlog: add a test checking revlog deltas for a churning file The test repository contains 5000 revisions and is therefore slow to build: five minutes with CHG, over fifteen minutes without. It is too slow to build during the test. Bundling all content produce a sizeable result, 20BM, too large to be committed. Instead, we commit a script to build the expected bundle and the test checks if the bundle is available. Any run of the script will produce the same repository content, using resulting in the same hashes. Using smaller repositories was tried, however, it misses most of the cases we are planning to improve. Having them in a 5000 repository is already nice, we usually see these case in repositories in the order of magnitude of one million revisions. This test will be very useful to check various changes strategy for building delta to store in a sparse-revlog. In this series we will focus our attention on the following metrics: The ones that will impact the final storage performance (size, space): * size of the revlog data file (".hg/store/data/*.d") * chain length info The ones that describe the deltas patterns: * number of snapshot revision (and their level) * size taken by snapshot revision (and their level)

Boris Feld - - Load All Authors

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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 [ ! -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     echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"'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

        > [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=74365490

        $ 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  :      101 ( 2.02%)

              lvl-0   :            101 ( 2.02%)

            deltas    :     4900 (97.98%)

        revision size : 74365490

            snapshot  : 20307865 (27.31%)

              lvl-0   :       20307865 (27.31%)

            deltas    : 54057625 (72.69%)

        chunks        :     5001

            0x78 (x)  :     5001 (100.00%)

        chunks size   : 74365490

            0x78 (x)  : 74365490 (100.00%)

        avg chain length  :       23

        max chain length  :       45

        max chain reach   : 11039464

        compression ratio :       23

        uncompressed data size (min/max/avg) : 346468 / 346472 / 346471

        full revision size (min/max/avg)     : 200927 / 201202 / 201067

        inter-snapshot size (min/max/avg)    : 0 / 0 / 0

        delta size (min/max/avg)             : 10649 / 103898 / 11032

        deltas against prev  : 4231 (86.35%)

            where prev = p1  : 4172     (98.61%)

            where prev = p2  :    0     ( 0.00%)

            other            :   59     ( 1.39%)

        deltas against p1    :  651 (13.29%)

        deltas against p2    :   18 ( 0.37%)

        deltas against other :    0 ( 0.00%)

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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 [ ! -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
				> [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=74365490
				$ 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 : 101 ( 2.02%)
				lvl-0 : 101 ( 2.02%)
				deltas : 4900 (97.98%)
				revision size : 74365490
				snapshot : 20307865 (27.31%)
				lvl-0 : 20307865 (27.31%)
				deltas : 54057625 (72.69%)

				chunks : 5001
				0x78 (x) : 5001 (100.00%)
				chunks size : 74365490
				0x78 (x) : 74365490 (100.00%)

				avg chain length : 23
				max chain length : 45
				max chain reach : 11039464
				compression ratio : 23

				uncompressed data size (min/max/avg) : 346468 / 346472 / 346471
				full revision size (min/max/avg) : 200927 / 201202 / 201067
				inter-snapshot size (min/max/avg) : 0 / 0 / 0
				delta size (min/max/avg) : 10649 / 103898 / 11032

				deltas against prev : 4231 (86.35%)
				where prev = p1 : 4172 (98.61%)
				where prev = p2 : 0 ( 0.00%)
				other : 59 ( 1.39%)
				deltas against p1 : 651 (13.29%)
				deltas against p2 : 18 ( 0.37%)
				deltas against other : 0 ( 0.00%)