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comparison.txt
author Bryan O'Sullivan <bos@serpentine.com>
Wed, 24 Aug 2005 12:39:10 -0700
changeset 1031 503aaf19a040
parent 139 17e66e1a0382
child 1308 2073e5a71008
permissions -rw-r--r--
Rewrite log command. New version is faster and more featureful. The original implementation of log walked backwards through history, which had terrible behaviour. It took several minutes to view complete kernel change history on a fast machine, for example. The rewrite uses a windowed approach to walk hunks of history forwards, while still giving results in reverse order. This reduces run time from five minutes to five seconds on my system. In addition, the rewrite uses our normal name handling mechanisms, so you can run a command like "hg log net/ipv4/**.c" and get a useful answer. It optimises for three different cases (no arguments, only files, and anything goes), so it performs well in all circumstances I've tested.
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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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17e66e1a0382 Minor updates to comparison
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storage naming      by filename    by revision hash        by filename
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2ab801e0ea9f A quick set of comparisons between hg, git, and bk
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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)













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


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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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2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

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













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

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













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

diff
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commit              O(changes)     O(changes)              ?













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

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                    6 patches/s    6 patches/s             slow













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

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













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


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                    < 1s           < 1s                    ?













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



mpm@selenic.com


parents: 

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



mpm@selenic.com


parents: 

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








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mpm@selenic.com


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



mpm@selenic.com


parents: 

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








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mpm@selenic.com


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 kernel history     300M           3.5G?                   250M?








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2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

diff
changeset




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lines of code       2500           6500 (+ cogito)         ??













2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

diff
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2ab801e0ea9f
A quick set of comparisons between hg, git, and bk



mpm@selenic.com


parents: 

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















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