Hi Guido,
I've checked this one out. Seems to be a consequence of the hg
developers decision to only ever append to a "revlog" (hg's basic
storage unit) and some other design decisions, Makes the storage quite
stable I assume at the cost of space inefficiency. A pity I think.
Heiner
Guido Ostkamp wrote:
Hi Heiner,
Developers, please: if you make big changes like this, use "svn move"
or it's equivalent to move the files, regardless if it's in SVN or
later in a DSCM. We don't want to have hundred's of megabytes dead
weights in a repository which every one needs to copy/clone many times.A
I regret to say this, but even if you use 'move' Mercurial does handle
this rather inefficient as you still get an additional full copy of the
latest version.
E.g.
$ hg init
$ cp /boot/vmlinuz .
$ hg add vmlinuz
$ hg commit -m "checkin 1"
$ du -s .
3120 .
$ hg mv vmlinuz vmlinuz.new
$ hg commit -m "checkin 2"
$ du -s .
4644 .
$ hg mv vmlinuz.new vmlinuz.newer
$ hg commit -m "checkin 3"
$ du -s .
6168 .
Obviously a lot of space is wasted with each 'move' although in the end
you only have one file in your working tree. In theory only a few bytes
would be needed to store a hint where the file came from earlier and
then access that already existing store for further history.
Git handles this much more efficiently:
$ git init
$ cp /boot/vmlinuz .
$ git add vmlinuz
$ git commit -m "checkin 1"
$ du -s .
3172 .
$ git mv vmlinuz vmlinuz.new
$ git commit -m "checkin 2"
$ du -s .
3180 .
$ git mv vmlinuz.new vmlinuz.newer
$ git commit -m "checkin 3"
$ du -s .
3188 .
This is how it should work.
Maybe the OpenOffice.org project has enough influence to persuade the
Mercurial developers to implement an improvement?
Regards
Guido
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