upstream/mercurial-mirror Files · tests/test-excessive-merge.t

perf: add command for measuring revlog chunk operations...

perf: add command for measuring revlog chunk operations Upcoming commits will teach revlogs to leverage the new compression engine API so that new compression formats can more easily be leveraged in revlogs. We want to be sure this refactoring doesn't regress performance. So this commit introduces "perfrevchunks" to explicitly test performance of reading, decompressing, and recompressing revlog chunks. Here is output when run on the mozilla-unified repo: $ hg perfrevlogchunks -c ! read ! wall 0.346603 comb 0.350000 user 0.340000 sys 0.010000 (best of 28) ! read w/ reused fd ! wall 0.337707 comb 0.340000 user 0.320000 sys 0.020000 (best of 30) ! read batch ! wall 0.013206 comb 0.020000 user 0.000000 sys 0.020000 (best of 221) ! read batch w/ reused fd ! wall 0.013259 comb 0.030000 user 0.010000 sys 0.020000 (best of 222) ! chunk ! wall 1.909939 comb 1.910000 user 1.900000 sys 0.010000 (best of 6) ! chunk batch ! wall 1.750677 comb 1.760000 user 1.740000 sys 0.020000 (best of 6) ! compress ! wall 5.668004 comb 5.670000 user 5.670000 sys 0.000000 (best of 3) $ hg perfrevlogchunks -m ! read ! wall 0.365834 comb 0.370000 user 0.350000 sys 0.020000 (best of 26) ! read w/ reused fd ! wall 0.350160 comb 0.350000 user 0.320000 sys 0.030000 (best of 28) ! read batch ! wall 0.024777 comb 0.020000 user 0.000000 sys 0.020000 (best of 119) ! read batch w/ reused fd ! wall 0.024895 comb 0.030000 user 0.000000 sys 0.030000 (best of 118) ! chunk ! wall 2.514061 comb 2.520000 user 2.480000 sys 0.040000 (best of 4) ! chunk batch ! wall 2.380788 comb 2.380000 user 2.360000 sys 0.020000 (best of 5) ! compress ! wall 9.815297 comb 9.820000 user 9.820000 sys 0.000000 (best of 3) We already see some interesting data, such as how much slower non-batched chunk reading is and that zlib compression appears to be >2x slower than decompression. I didn't have the data when I wrote this commit message, but I ran this on Mozilla's NFS-based Mercurial server and the time for reading with a reused file descriptor was faster. So I think it is worth testing both with and without file descriptor reuse so we can make informed decisions about recycling file descriptors.

Gregory Szorc - - Load All Authors

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        $ hg init

        $ echo foo > a

        $ echo foo > b

        $ hg add a b

        $ hg ci -m "test"

        $ echo blah > a

        $ hg ci -m "branch a"

        $ hg co 0

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ echo blah > b

        $ hg ci -m "branch b"

        created new head

        $ HGMERGE=true hg merge 1

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg ci -m "merge b/a -> blah"

        $ hg co 1

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ HGMERGE=true hg merge 2

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg ci -m "merge a/b -> blah"

        created new head

        $ hg log

        changeset:   4:2ee31f665a86

        tag:         tip

        parent:      1:96155394af80

        parent:      2:92cc4c306b19

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     merge a/b -> blah

        changeset:   3:e16a66a37edd

        parent:      2:92cc4c306b19

        parent:      1:96155394af80

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     merge b/a -> blah

        changeset:   2:92cc4c306b19

        parent:      0:5e0375449e74

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     branch b

        changeset:   1:96155394af80

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     branch a

        changeset:   0:5e0375449e74

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     test

        $ hg debugindex --changelog

           rev    offset  length  ..... linkrev nodeid       p1           p2 (re)

             0         0      60  .....       0 5e0375449e74 000000000000 000000000000 (re)

             1        60      62  .....       1 96155394af80 5e0375449e74 000000000000 (re)

             2       122      62  .....       2 92cc4c306b19 5e0375449e74 000000000000 (re)

             3       184      69  .....       3 e16a66a37edd 92cc4c306b19 96155394af80 (re)

             4       253      69  .....       4 2ee31f665a86 96155394af80 92cc4c306b19 (re)

      revision 1

        $ hg manifest --debug 1

        79d7492df40aa0fa093ec4209be78043c181f094 644   a

        2ed2a3912a0b24502043eae84ee4b279c18b90dd 644   b

      revision 2

        $ hg manifest --debug 2

        2ed2a3912a0b24502043eae84ee4b279c18b90dd 644   a

        79d7492df40aa0fa093ec4209be78043c181f094 644   b

      revision 3

        $ hg manifest --debug 3

        79d7492df40aa0fa093ec4209be78043c181f094 644   a

        79d7492df40aa0fa093ec4209be78043c181f094 644   b

      revision 4

        $ hg manifest --debug 4

        79d7492df40aa0fa093ec4209be78043c181f094 644   a

        79d7492df40aa0fa093ec4209be78043c181f094 644   b

        $ hg debugindex a

           rev    offset  length  ..... linkrev nodeid       p1           p2 (re)

             0         0       5  .....       0 2ed2a3912a0b 000000000000 000000000000 (re)

             1         5       6  .....       1 79d7492df40a 2ed2a3912a0b 000000000000 (re)

        $ hg verify

        checking changesets

        checking manifests

        crosschecking files in changesets and manifests

        checking files

        2 files, 5 changesets, 4 total revisions

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				$ hg init

				$ echo foo > a
				$ echo foo > b
				$ hg add a b

				$ hg ci -m "test"

				$ echo blah > a

				$ hg ci -m "branch a"

				$ hg co 0
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved

				$ echo blah > b

				$ hg ci -m "branch b"
				created new head
				$ HGMERGE=true hg merge 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg ci -m "merge b/a -> blah"

				$ hg co 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				$ HGMERGE=true hg merge 2
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)
				$ hg ci -m "merge a/b -> blah"
				created new head

				$ hg log
				changeset: 4:2ee31f665a86
				tag: tip
				parent: 1:96155394af80
				parent: 2:92cc4c306b19
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: merge a/b -> blah

				changeset: 3:e16a66a37edd
				parent: 2:92cc4c306b19
				parent: 1:96155394af80
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: merge b/a -> blah

				changeset: 2:92cc4c306b19
				parent: 0:5e0375449e74
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: branch b

				changeset: 1:96155394af80
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: branch a

				changeset: 0:5e0375449e74
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: test

				$ hg debugindex --changelog
				rev offset length ..... linkrev nodeid p1 p2 (re)
				0 0 60 ..... 0 5e0375449e74 000000000000 000000000000 (re)
				1 60 62 ..... 1 96155394af80 5e0375449e74 000000000000 (re)
				2 122 62 ..... 2 92cc4c306b19 5e0375449e74 000000000000 (re)
				3 184 69 ..... 3 e16a66a37edd 92cc4c306b19 96155394af80 (re)
				4 253 69 ..... 4 2ee31f665a86 96155394af80 92cc4c306b19 (re)

				revision 1
				$ hg manifest --debug 1
				79d7492df40aa0fa093ec4209be78043c181f094 644 a
				2ed2a3912a0b24502043eae84ee4b279c18b90dd 644 b
				revision 2
				$ hg manifest --debug 2
				2ed2a3912a0b24502043eae84ee4b279c18b90dd 644 a
				79d7492df40aa0fa093ec4209be78043c181f094 644 b
				revision 3
				$ hg manifest --debug 3
				79d7492df40aa0fa093ec4209be78043c181f094 644 a
				79d7492df40aa0fa093ec4209be78043c181f094 644 b
				revision 4
				$ hg manifest --debug 4
				79d7492df40aa0fa093ec4209be78043c181f094 644 a
				79d7492df40aa0fa093ec4209be78043c181f094 644 b

				$ hg debugindex a
				rev offset length ..... linkrev nodeid p1 p2 (re)
				0 0 5 ..... 0 2ed2a3912a0b 000000000000 000000000000 (re)
				1 5 6 ..... 1 79d7492df40a 2ed2a3912a0b 000000000000 (re)

				$ hg verify
				checking changesets
				checking manifests
				crosschecking files in changesets and manifests
				checking files
				2 files, 5 changesets, 4 total revisions