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comparison.txt
author Vadim Gelfer <vadim.gelfer@gmail.com>
Fri, 24 Mar 2006 09:08:12 -0800
changeset 1998 65cc17ae9649
parent 1308 2073e5a71008
permissions -rw-r--r--
fix race in localrepo.addchangegroup. localrepo.addchangegroup writes to changelog, then manifest, then normal files. this breaks access ordering. if reader reads changelog while manifest is being written, can find pointers into places in manifest that are not yet written. same can happen for manifest and normal files. fix is to make almost no change to localrepo.addchangegroup. it must to write changelog and manifest data early because it has to read them while writing other files. instead, write changelog and manifest data to temp file that reader cannot see, then append temp data to manifest after all normal files written, finally append temp data to changelog. temp file code is in new appendfile module. can be used in other places with small changes. much smaller race still left. we write all new data in one write call, but reader can maybe see partial update because python or os or filesystem cannot always make write really atomic. file locking no help: slow, not portable, not reliable over nfs. only real safe other plan is write to temp file every time and rename, but performance bad when manifest or changelog is big.
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2ab801e0ea9f A quick set of comparisons between hg, git, and bk
mpm@selenic.com
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                    Mercurial      git                     BK (*)
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storage             revlog delta   compressed revisions    SCCS weave
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storage naming      by filename    by revision hash        by filename
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merge               file DAGs      changeset DAG           file DAGs?
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consistency         SHA1           SHA1                    CRC
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2073e5a71008 Cleanup of tabs and trailing spaces.
Thomas Arendsen Hein <thomas@intevation.de>
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signable?           yes            yes                     no
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retrieve file tip   O(1)           O(1)                    O(revs)













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add rev             O(1)           O(1)                    O(revs)













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find prev file rev  O(1)           O(changesets)           O(revs)








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annotate file       O(revs)        O(changesets)           O(revs)








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find file changeset O(1)           O(changesets)           ?













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checkout            O(files)       O(files)                O(revs)?













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commit              O(changes)     O(changes)              ?













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                    6 patches/s    6 patches/s             slow













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diff working dir    O(changes)     O(changes)              ?













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                    < 1s           < 1s                    ?













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tree diff revs      O(changes)     O(changes)              ?













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                    < 1s           < 1s                    ?








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hardlink clone      O(files)       O(revisions)            O(files)













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find remote csets   O(log new)     rsync: O(revisions)     ?













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                                   git-http: O(changesets)








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pull remote csets   O(patch)       O(modified files)       O(patch)








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repo growth         O(patch)       O(revisions)            O(patch)








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 kernel history     300M           3.5G?                   250M?








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A quick set of comparisons between hg, git, and bk



mpm@selenic.com


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lines of code       2500           6500 (+ cogito)         ??













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A quick set of comparisons between hg, git, and bk



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A quick set of comparisons between hg, git, and bk



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* I've never used BK so this is just guesses















mercurial-crew-with-dirclash