comparison.txt
author Vadim Gelfer <vadim.gelfer@gmail.com>
Fri, 07 Jul 2006 15:02:55 -0700
changeset 2577 fa76c5d609c9
parent 1308 2073e5a71008
permissions -rw-r--r--
bdiff: improve worst case behavior by 100x. on 5.8MB (244.000 lines) text file with similar lines, hash before this change made diff against empty file take 75 seconds. this change improves performance to 0.6 seconds. result is that clone of smallish repo (137MB) with some files like this takes 1 minute instead of 10 minutes. common case of diff is 10% slower now, probably because of worse cache locality. but diff does not affect overall performance in common case (less than 1% of runtime is in diff when it is working ok), so this tradeoff looks good.
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2ab801e0ea9f A quick set of comparisons between hg, git, and bk
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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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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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lines of code       2500           6500 (+ cogito)         ??
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* I've never used BK so this is just guesses