Hi Guys!
First of all, I must admit that I got seriously hooked up on Git when
I started to
use it internally for FFmpeg development and my life as far as non
company
related projects are concerned hasn't been the same ever since. The way
Git addresses issues like branches (both local and remote), merges and
content tracking are, in my opinion, quite superior to the
alternative SCMs
such as Mercurial. In fact, that's why when I saw my coworkers
struggling
with exactly the same issues around NetBeans Mercurial repository my
natural instinct was to introduce them to Git and show them that life
doesn't
have to be that complicated or troublesome.
But before I can do that, there's a little issue that I either need
to address or
at least understand better. It seems that the storage requirements
for the
repository that a friend of mine and I created from: http://
hg.netbeans.org/main/
got doubled under Git:
$ du -sh Mercurial- nb-main
491M Mercurial- nb-main
$ du -sh Git-nb-main
1.1G Git-nb-main
The repository was created using hg2git (the one based on git-fast-
import)
and it was GC'ed and REPACK'ed just in case. I spent some time trying
to understand the issue and here's some statistics on the kind of
objects
that this repository consists of:
75053 commit
334572 blob
750003 tree
The last item (trees) also seem to take the most space and the most
reasonable
explanation that I can offer is that NetBeans repository has a really
weird
structure where they have approximately 700 (yes, seven hundred!) top-
level
subdirectories there. They are clearly Submodules-shy, but that's
another
issue that I will need to address with them.
So based on my preliminary analysis the biggest culprit seems to be
that for every commit at least one pretty hefty tree object needs to
be created
(remember 700 top level subdirectories). These objects are all in 18-20K
range but they are almost identical to each other except for one or two
trees that they refer to.
So here's my question: is there anything in Git that I can use to
accommodate
a repository like http://hg.netbeans.org/main in an efficient manner?
Any
kind of ideas (like particular command line options for repack, etc.)
would be
greatly appreciated!
Thanks,
Roman.
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