view comparison.txt @ 249:619e775aa7f9

import and startup cleanups

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import and startup cleanups

add commands:run()
add copyright notice to commands
eliminate/reorganize imports to speed up start time:

0.5b:
$ time bash -c 'for i in `seq 100`; do ~/bin/hg > /dev/null; done'

real    0m7.718s
user    0m6.719s
sys     0m0.794s

new:

$ time bash -c 'for i in `seq 100`; do hg > /dev/null; done' 
real    0m2.171s
user    0m1.684s
sys     0m0.444s

just python:

$ time bash -c 'for i in `seq 100`; do python -c pass; done' 
real    0m0.988s
user    0m0.771s
sys     0m0.207s

Ignoring the fixed cost of loading the Python interpreter, we're 5.6
times faster. With the Python load time, we're still 3.5 times faster.

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                    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