comparison.txt
author Raphael Marmier <raphael@marmier.net>
Mon, 03 Jul 2006 10:18:46 -0700
changeset 2550 45235e492cc6
parent 1308 2073e5a71008
permissions -rw-r--r--
Disable automatic line endings conversion on windows The rationale behind this is that such conversion implies a particular situation in which all files in the repo are terminated by only LF. This is documented nowhere and it bit me sharply when I upgraded. Furthermore, it works on the assumption that a file containing no NULL characters are actually a text file. Therefore it cannot guarantee that no binary file will be harmed in the process. Currently, if a file already contains CRLF line endings when it is copied to the working dir from the repo, then the version in the working dir will be corrupted by an extra CR. I'm working on a patch that will turn this into a warning. But as a side effect, committing such a file back will strip it from its CR. In all case, unrequested data modification can occur under the feet of the user, which is bad(tm), ihmo.

                    Mercurial      git                     BK (*)
storage             revlog delta   compressed revisions    SCCS weave
storage naming      by filename    by revision hash        by filename
merge               file DAGs      changeset DAG           file DAGs?
consistency         SHA1           SHA1                    CRC
signable?           yes            yes                     no

retrieve file tip   O(1)           O(1)                    O(revs)
add rev             O(1)           O(1)                    O(revs)
find prev file rev  O(1)           O(changesets)           O(revs)
annotate file       O(revs)        O(changesets)           O(revs)
find file changeset O(1)           O(changesets)           ?

checkout            O(files)       O(files)                O(revs)?
commit              O(changes)     O(changes)              ?
                    6 patches/s    6 patches/s             slow
diff working dir    O(changes)     O(changes)              ?
                    < 1s           < 1s                    ?
tree diff revs      O(changes)     O(changes)              ?
                    < 1s           < 1s                    ?
hardlink clone      O(files)       O(revisions)            O(files)

find remote csets   O(log new)     rsync: O(revisions)     ?
                                   git-http: O(changesets)
pull remote csets   O(patch)       O(modified files)       O(patch)

repo growth         O(patch)       O(revisions)            O(patch)
 kernel history     300M           3.5G?                   250M?
lines of code       2500           6500 (+ cogito)         ??

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