[Monotone-devel] mtn size (of revision)

[Lapo Luchini]

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I'm probably one of the few interested, but I *like* to know how much a
new revision "costs" to me, in terms of space, partly because I'm a
statistics freak, part because the less it occupies the "better mtn is"
and mostly because, well, disk space may well be cheap nowadays, but
wasting is not good anyway 0=)

One (personal) application of mtn is, example given, the versioning of
my Palm databases backup files (.pdb and .prc obtained thru
pilot-link.org): the whole database is around 9MB, and a good 20% of the
files is "touched" by each sync, but by the very record-based nature of
Palm databases, xdelta works like magic.
Of course I can know this for sure sync'ing that branch to a single
database and then:

% LANG=C mtn -d palm.mtn db info
creator code      : _MTN (0x5f4d544e)
schema version    : 7ca81b45279403419581d7fde31ed888a80bd34e (usable)
counts:
  full rosters    :   1
  roster deltas   :   5
  full files      : 165
  file deltas     : 190
  revisions       :   6
  ancestry edges  :   6
  certs           :  24
  logical files   : 165
bytes:
  full rosters    :    8092
  roster deltas   :    8259
  full files      : 4957002
  file deltas     :   63716
  revisions       :   19952
  cached ancestry :     440
  certs           :    5871
  heights         :     264
  total           : 5063596
database:
  page size       : 8192
  cache size      : 2000

...which is quite impressive (98% of size in revision 1 out of 5).

But in the future a mini-project of mine could be to have this kind of
info about a specific revision, or a specific branch, or a generic
selector maybe (listing each revision or the total).

Useful? Probably next to nothing.
Nice? Yes.
Urgent? Not at all. I'd rather use my time helping cvsimport/cvsync
stuff I care much more about.
OTOH it probably is a bite-sized mini-project...

Well. I wrote it mainly to remember to myself to do it someday.
And it probably is easy too... (probably need to do a few queries and
that's it, just like I guess it is for "db info")
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