bisect: avoid copying ancestor list for non-merge commits
During a bisection, hg needs to compute a list of all ancestors for every
candidate commit. This is accomplished via a bottom-up traversal of the set of
candidates, during which each revision's ancestor list is populated using the
ancestor list of its parent(s). Previously, this involved copying the entire
list, which could be very long in if the bisection range was large.
To help improve this, we can observe that each candidate commit is visited
exactly once, at which point its ancestor list is copied into its children's
lists and then dropped. In the case of non-merge commits, a commit's ancestor
list consists exactly of its parent's list plus itself. This means that we can
trivially reuse the parent's existing list for one of its non-merge children,
which avoids copying entirely if that commit is the parent's only child. This
makes bisections over linear ranges of commits much faster.
During some informal testing in the large publicly-available `mozilla-central`
repository, this noticeably sped up bisections over large ranges of history:
Setup:
$ cd mozilla-central
$ hg bisect --reset
$ hg bisect --good 0
$ hg log -r tip -T '{rev}\n'
628417
Test:
$ time hg bisect --bad tip --noupdate
Before:
real 3m35.927s
user 3m35.553s
sys 0m0.319s
After:
real 1m41.142s
user 1m40.810s
sys 0m0.285s
#
# This file is autogenerated by pip-compile
# To update, run:
#
# pip-compile --generate-hashes --output-file=contrib/automation/linux-requirements-py3.5.txt contrib/automation/linux-requirements.txt.in
#
astroid==2.4.2 \
--hash=sha256:2f4078c2a41bf377eea06d71c9d2ba4eb8f6b1af2135bec27bbbb7d8f12bb703 \
--hash=sha256:bc58d83eb610252fd8de6363e39d4f1d0619c894b0ed24603b881c02e64c7386
# via pylint
docutils==0.17.1 \
--hash=sha256:686577d2e4c32380bb50cbb22f575ed742d58168cee37e99117a854bcd88f125 \
--hash=sha256:cf316c8370a737a022b72b56874f6602acf974a37a9fba42ec2876387549fc61
# via -r contrib/automation/linux-requirements.txt.in
fuzzywuzzy==0.18.0 \
--hash=sha256:45016e92264780e58972dca1b3d939ac864b78437422beecebb3095f8efd00e8 \
--hash=sha256:928244b28db720d1e0ee7587acf660ea49d7e4c632569cad4f1cd7e68a5f0993
# via -r contrib/automation/linux-requirements.txt.in
idna==3.1 \
--hash=sha256:5205d03e7bcbb919cc9c19885f9920d622ca52448306f2377daede5cf3faac16 \
--hash=sha256:c5b02147e01ea9920e6b0a3f1f7bb833612d507592c837a6c49552768f4054e1
# via yarl
isort==4.3.21 \
--hash=sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1 \
--hash=sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd
# via
# -r contrib/automation/linux-requirements.txt.in
# pylint
lazy-object-proxy==1.4.3 \
--hash=sha256:0c4b206227a8097f05c4dbdd323c50edf81f15db3b8dc064d08c62d37e1a504d \
--hash=sha256:194d092e6f246b906e8f70884e620e459fc54db3259e60cf69a4d66c3fda3449 \
--hash=sha256:1be7e4c9f96948003609aa6c974ae59830a6baecc5376c25c92d7d697e684c08 \
--hash=sha256:4677f594e474c91da97f489fea5b7daa17b5517190899cf213697e48d3902f5a \
--hash=sha256:48dab84ebd4831077b150572aec802f303117c8cc5c871e182447281ebf3ac50 \
--hash=sha256:5541cada25cd173702dbd99f8e22434105456314462326f06dba3e180f203dfd \
--hash=sha256:59f79fef100b09564bc2df42ea2d8d21a64fdcda64979c0fa3db7bdaabaf6239 \
--hash=sha256:8d859b89baf8ef7f8bc6b00aa20316483d67f0b1cbf422f5b4dc56701c8f2ffb \
--hash=sha256:9254f4358b9b541e3441b007a0ea0764b9d056afdeafc1a5569eee1cc6c1b9ea \
--hash=sha256:9651375199045a358eb6741df3e02a651e0330be090b3bc79f6d0de31a80ec3e \
--hash=sha256:97bb5884f6f1cdce0099f86b907aa41c970c3c672ac8b9c8352789e103cf3156 \
--hash=sha256:9b15f3f4c0f35727d3a0fba4b770b3c4ebbb1fa907dbcc046a1d2799f3edd142 \
--hash=sha256:a2238e9d1bb71a56cd710611a1614d1194dc10a175c1e08d75e1a7bcc250d442 \
--hash=sha256:a6ae12d08c0bf9909ce12385803a543bfe99b95fe01e752536a60af2b7797c62 \
--hash=sha256:ca0a928a3ddbc5725be2dd1cf895ec0a254798915fb3a36af0964a0a4149e3db \
--hash=sha256:cb2c7c57005a6804ab66f106ceb8482da55f5314b7fcb06551db1edae4ad1531 \
--hash=sha256:d74bb8693bf9cf75ac3b47a54d716bbb1a92648d5f781fc799347cfc95952383 \
--hash=sha256:d945239a5639b3ff35b70a88c5f2f491913eb94871780ebfabb2568bd58afc5a \
--hash=sha256:eba7011090323c1dadf18b3b689845fd96a61ba0a1dfbd7f24b921398affc357 \
--hash=sha256:efa1909120ce98bbb3777e8b6f92237f5d5c8ea6758efea36a473e1d38f7d3e4 \
--hash=sha256:f3900e8a5de27447acbf900b4750b0ddfd7ec1ea7fbaf11dfa911141bc522af0
# via astroid
mccabe==0.6.1 \
--hash=sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42 \
--hash=sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f
# via pylint
multidict==5.0.2 \
--hash=sha256:060d68ae3e674c913ec41a464916f12c4d7ff17a3a9ebbf37ba7f2c681c2b33e \
--hash=sha256:06f39f0ddc308dab4e5fa282d145f90cd38d7ed75390fc83335636909a9ec191 \
--hash=sha256:17847fede1aafdb7e74e01bb34ab47a1a1ea726e8184c623c45d7e428d2d5d34 \
--hash=sha256:1cd102057b09223b919f9447c669cf2efabeefb42a42ae6233f25ffd7ee31a79 \
--hash=sha256:20cc9b2dd31761990abff7d0e63cd14dbfca4ebb52a77afc917b603473951a38 \
--hash=sha256:2576e30bbec004e863d87216bc34abe24962cc2e964613241a1c01c7681092ab \
--hash=sha256:2ab9cad4c5ef5c41e1123ed1f89f555aabefb9391d4e01fd6182de970b7267ed \
--hash=sha256:359ea00e1b53ceef282232308da9d9a3f60d645868a97f64df19485c7f9ef628 \
--hash=sha256:3e61cc244fd30bd9fdfae13bdd0c5ec65da51a86575ff1191255cae677045ffe \
--hash=sha256:43c7a87d8c31913311a1ab24b138254a0ee89142983b327a2c2eab7a7d10fea9 \
--hash=sha256:4a3f19da871befa53b48dd81ee48542f519beffa13090dc135fffc18d8fe36db \
--hash=sha256:4df708ef412fd9b59b7e6c77857e64c1f6b4c0116b751cb399384ec9a28baa66 \
--hash=sha256:59182e975b8c197d0146a003d0f0d5dc5487ce4899502061d8df585b0f51fba2 \
--hash=sha256:6128d2c0956fd60e39ec7d1c8f79426f0c915d36458df59ddd1f0cff0340305f \
--hash=sha256:6168839491a533fa75f3f5d48acbb829475e6c7d9fa5c6e245153b5f79b986a3 \
--hash=sha256:62abab8088704121297d39c8f47156cb8fab1da731f513e59ba73946b22cf3d0 \
--hash=sha256:653b2bbb0bbf282c37279dd04f429947ac92713049e1efc615f68d4e64b1dbc2 \
--hash=sha256:6566749cd78cb37cbf8e8171b5cd2cbfc03c99f0891de12255cf17a11c07b1a3 \
--hash=sha256:76cbdb22f48de64811f9ce1dd4dee09665f84f32d6a26de249a50c1e90e244e0 \
--hash=sha256:8efcf070d60fd497db771429b1c769a3783e3a0dd96c78c027e676990176adc5 \
--hash=sha256:8fa4549f341a057feec4c3139056ba73e17ed03a506469f447797a51f85081b5 \
--hash=sha256:9380b3f2b00b23a4106ba9dd022df3e6e2e84e1788acdbdd27603b621b3288df \
--hash=sha256:9ed9b280f7778ad6f71826b38a73c2fdca4077817c64bc1102fdada58e75c03c \
--hash=sha256:a7b8b5bd16376c8ac2977748bd978a200326af5145d8d0e7f799e2b355d425b6 \
--hash=sha256:af271c2540d1cd2a137bef8d95a8052230aa1cda26dd3b2c73d858d89993d518 \
--hash=sha256:b561e76c9e21402d9a446cdae13398f9942388b9bff529f32dfa46220af54d00 \
--hash=sha256:b82400ef848bbac6b9035a105ac6acaa1fb3eea0d164e35bbb21619b88e49fed \
--hash=sha256:b98af08d7bb37d3456a22f689819ea793e8d6961b9629322d7728c4039071641 \
--hash=sha256:c58e53e1c73109fdf4b759db9f2939325f510a8a5215135330fe6755921e4886 \
--hash=sha256:cbabfc12b401d074298bfda099c58dfa5348415ae2e4ec841290627cb7cb6b2e \
--hash=sha256:d4a6fb98e9e9be3f7d70fd3e852369c00a027bd5ed0f3e8ade3821bcad257408 \
--hash=sha256:d99da85d6890267292065e654a329e1d2f483a5d2485e347383800e616a8c0b1 \
--hash=sha256:e58db0e0d60029915f7fc95a8683fa815e204f2e1990f1fb46a7778d57ca8c35 \
--hash=sha256:e5bf89fe57f702a046c7ec718fe330ed50efd4bcf74722940db2eb0919cddb1c \
--hash=sha256:f612e8ef8408391a4a3366e3508bab8ef97b063b4918a317cb6e6de4415f01af \
--hash=sha256:f65a2442c113afde52fb09f9a6276bbc31da71add99dc76c3adf6083234e07c6 \
--hash=sha256:fa0503947a99a1be94f799fac89d67a5e20c333e78ddae16e8534b151cdc588a
# via yarl
pyflakes==2.3.1 \
--hash=sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3 \
--hash=sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db
# via -r contrib/automation/linux-requirements.txt.in
pygments==2.9.0 \
--hash=sha256:a18f47b506a429f6f4b9df81bb02beab9ca21d0a5fee38ed15aef65f0545519f \
--hash=sha256:d66e804411278594d764fc69ec36ec13d9ae9147193a1740cd34d272ca383b8e
# via -r contrib/automation/linux-requirements.txt.in
pylint==2.6.2 \
--hash=sha256:718b74786ea7ed07aa0c58bf572154d4679f960d26e9641cc1de204a30b87fc9 \
--hash=sha256:e71c2e9614a4f06e36498f310027942b0f4f2fde20aebb01655b31edc63b9eaf
# via -r contrib/automation/linux-requirements.txt.in
python-levenshtein==0.12.2 \
--hash=sha256:dc2395fbd148a1ab31090dd113c366695934b9e85fe5a4b2a032745efd0346f6
# via -r contrib/automation/linux-requirements.txt.in
pyyaml==5.3.1 \
--hash=sha256:06a0d7ba600ce0b2d2fe2e78453a470b5a6e000a985dd4a4e54e436cc36b0e97 \
--hash=sha256:240097ff019d7c70a4922b6869d8a86407758333f02203e0fc6ff79c5dcede76 \
--hash=sha256:4f4b913ca1a7319b33cfb1369e91e50354d6f07a135f3b901aca02aa95940bd2 \
--hash=sha256:6034f55dab5fea9e53f436aa68fa3ace2634918e8b5994d82f3621c04ff5ed2e \
--hash=sha256:69f00dca373f240f842b2931fb2c7e14ddbacd1397d57157a9b005a6a9942648 \
--hash=sha256:73f099454b799e05e5ab51423c7bcf361c58d3206fa7b0d555426b1f4d9a3eaf \
--hash=sha256:74809a57b329d6cc0fdccee6318f44b9b8649961fa73144a98735b0aaf029f1f \
--hash=sha256:7739fc0fa8205b3ee8808aea45e968bc90082c10aef6ea95e855e10abf4a37b2 \
--hash=sha256:95f71d2af0ff4227885f7a6605c37fd53d3a106fcab511b8860ecca9fcf400ee \
--hash=sha256:ad9c67312c84def58f3c04504727ca879cb0013b2517c85a9a253f0cb6380c0a \
--hash=sha256:b8eac752c5e14d3eca0e6dd9199cd627518cb5ec06add0de9d32baeee6fe645d \
--hash=sha256:cc8955cfbfc7a115fa81d85284ee61147059a753344bc51098f3ccd69b0d7e0c \
--hash=sha256:d13155f591e6fcc1ec3b30685d50bf0711574e2c0dfffd7644babf8b5102ca1a
# via vcrpy
six==1.16.0 \
--hash=sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926 \
--hash=sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
# via
# astroid
# vcrpy
toml==0.10.2 \
--hash=sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b \
--hash=sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f
# via pylint
typed-ast==1.4.3 ; python_version >= "3.0" and platform_python_implementation != "PyPy" \
--hash=sha256:01ae5f73431d21eead5015997ab41afa53aa1fbe252f9da060be5dad2c730ace \
--hash=sha256:067a74454df670dcaa4e59349a2e5c81e567d8d65458d480a5b3dfecec08c5ff \
--hash=sha256:0fb71b8c643187d7492c1f8352f2c15b4c4af3f6338f21681d3681b3dc31a266 \
--hash=sha256:1b3ead4a96c9101bef08f9f7d1217c096f31667617b58de957f690c92378b528 \
--hash=sha256:2068531575a125b87a41802130fa7e29f26c09a2833fea68d9a40cf33902eba6 \
--hash=sha256:209596a4ec71d990d71d5e0d312ac935d86930e6eecff6ccc7007fe54d703808 \
--hash=sha256:2c726c276d09fc5c414693a2de063f521052d9ea7c240ce553316f70656c84d4 \
--hash=sha256:398e44cd480f4d2b7ee8d98385ca104e35c81525dd98c519acff1b79bdaac363 \
--hash=sha256:52b1eb8c83f178ab787f3a4283f68258525f8d70f778a2f6dd54d3b5e5fb4341 \
--hash=sha256:5feca99c17af94057417d744607b82dd0a664fd5e4ca98061480fd8b14b18d04 \
--hash=sha256:7538e495704e2ccda9b234b82423a4038f324f3a10c43bc088a1636180f11a41 \
--hash=sha256:760ad187b1041a154f0e4d0f6aae3e40fdb51d6de16e5c99aedadd9246450e9e \
--hash=sha256:777a26c84bea6cd934422ac2e3b78863a37017618b6e5c08f92ef69853e765d3 \
--hash=sha256:95431a26309a21874005845c21118c83991c63ea800dd44843e42a916aec5899 \
--hash=sha256:9ad2c92ec681e02baf81fdfa056fe0d818645efa9af1f1cd5fd6f1bd2bdfd805 \
--hash=sha256:9c6d1a54552b5330bc657b7ef0eae25d00ba7ffe85d9ea8ae6540d2197a3788c \
--hash=sha256:aee0c1256be6c07bd3e1263ff920c325b59849dc95392a05f258bb9b259cf39c \
--hash=sha256:af3d4a73793725138d6b334d9d247ce7e5f084d96284ed23f22ee626a7b88e39 \
--hash=sha256:b36b4f3920103a25e1d5d024d155c504080959582b928e91cb608a65c3a49e1a \
--hash=sha256:b9574c6f03f685070d859e75c7f9eeca02d6933273b5e69572e5ff9d5e3931c3 \
--hash=sha256:bff6ad71c81b3bba8fa35f0f1921fb24ff4476235a6e94a26ada2e54370e6da7 \
--hash=sha256:c190f0899e9f9f8b6b7863debfb739abcb21a5c054f911ca3596d12b8a4c4c7f \
--hash=sha256:c907f561b1e83e93fad565bac5ba9c22d96a54e7ea0267c708bffe863cbe4075 \
--hash=sha256:cae53c389825d3b46fb37538441f75d6aecc4174f615d048321b716df2757fb0 \
--hash=sha256:dd4a21253f42b8d2b48410cb31fe501d32f8b9fbeb1f55063ad102fe9c425e40 \
--hash=sha256:dde816ca9dac1d9c01dd504ea5967821606f02e510438120091b84e852367428 \
--hash=sha256:f2362f3cb0f3172c42938946dbc5b7843c2a28aec307c49100c8b38764eb6927 \
--hash=sha256:f328adcfebed9f11301eaedfa48e15bdece9b519fb27e6a8c01aa52a17ec31b3 \
--hash=sha256:f8afcf15cc511ada719a88e013cec87c11aff7b91f019295eb4530f96fe5ef2f \
--hash=sha256:fb1bbeac803adea29cedd70781399c99138358c26d05fcbd23c13016b7f5ec65
# via
# -r contrib/automation/linux-requirements.txt.in
# astroid
vcrpy==4.1.1 \
--hash=sha256:12c3fcdae7b88ecf11fc0d3e6d77586549d4575a2ceee18e82eee75c1f626162 \
--hash=sha256:57095bf22fc0a2d99ee9674cdafebed0f3ba763018582450706f7d3a74fff599
# via -r contrib/automation/linux-requirements.txt.in
wrapt==1.12.1 \
--hash=sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7
# via
# astroid
# vcrpy
yarl==1.3.0 \
--hash=sha256:024ecdc12bc02b321bc66b41327f930d1c2c543fa9a561b39861da9388ba7aa9 \
--hash=sha256:2f3010703295fbe1aec51023740871e64bb9664c789cba5a6bdf404e93f7568f \
--hash=sha256:3890ab952d508523ef4881457c4099056546593fa05e93da84c7250516e632eb \
--hash=sha256:3e2724eb9af5dc41648e5bb304fcf4891adc33258c6e14e2a7414ea32541e320 \
--hash=sha256:5badb97dd0abf26623a9982cd448ff12cb39b8e4c94032ccdedf22ce01a64842 \
--hash=sha256:73f447d11b530d860ca1e6b582f947688286ad16ca42256413083d13f260b7a0 \
--hash=sha256:7ab825726f2940c16d92aaec7d204cfc34ac26c0040da727cf8ba87255a33829 \
--hash=sha256:b25de84a8c20540531526dfbb0e2d2b648c13fd5dd126728c496d7c3fea33310 \
--hash=sha256:c6e341f5a6562af74ba55205dbd56d248daf1b5748ec48a0200ba227bb9e33f4 \
--hash=sha256:c9bb7c249c4432cd47e75af3864bc02d26c9594f49c82e2a28624417f0ae63b8 \
--hash=sha256:e060906c0c585565c718d1c3841747b61c5439af2211e185f6739a9412dfbde1
# via vcrpy
# WARNING: The following packages were not pinned, but pip requires them to be
# pinned when the requirements file includes hashes. Consider using the --allow-unsafe flag.
# setuptools