| 1 |
On Fri, Oct 29, 2010 at 09:28:34PM -0500, Donnie Berkholz wrote: |
| 2 |
> With 4K blocks, that works out at roughly 500 MB (CVS) to 2 GB (SVN, |
| 3 |
> Git) of inode overhead. I have a hard time imagining people so hard up |
| 4 |
> for disk space that they can fit the whole git repo but can't find |
| 5 |
> another 1.5 GB. |
| 6 |
I'd like to ask the embedded arch folk how they feel about that size |
| 7 |
proposal. I know some of the MIPS team were running 2.1GB SCSI drives, |
| 8 |
and complaining already. |
| 9 |
|
| 10 |
> Based on my current git conversion with a pack size of 1.7 GB, I suppose |
| 11 |
> that means the total repo in a git world could vary from ~2 GB all the |
| 12 |
> way up to ~4 GB. |
| 13 |
There is one oversimplification here, that the pack will actually be |
| 14 |
that large... |
| 15 |
|
| 16 |
I'm playing with graft points, and the tree as it stands, with no |
| 17 |
history (single commit), is a single 66MiB pack. I've included some more |
| 18 |
numbers for going further back in history: |
| 19 |
|
| 20 |
Command I've used to generate the numbers below: |
| 21 |
|
| 22 |
# ( cd gentoo-x86-git-authors.git/ ; git fast-export ${START}..HEAD ) | \ |
| 23 |
( rm -rf trim ; mkdir trim ; cd trim ; git init ; \ |
| 24 |
time git fast-import --stats ; \ |
| 25 |
du .git ; \ |
| 26 |
time git gc --aggressive ; \ |
| 27 |
du .git ) |
| 28 |
|
| 29 |
End point: Tue Oct 26 15:43:01 2010 +0000 |
| 30 |
Pack sizes by starting point: |
| 31 |
Tue Oct 26 15:43:01 2010 +0000: 71016 KiB (single commit) |
| 32 |
Fri Oct 01 00:25:21 2010 +0000: 81760 KiB |
| 33 |
Wed Sep 01 02:20:31 2010 +0000: 92636 KiB |
| 34 |
Sun Aug 01 00:45:49 2010 +0000: 103248 KiB |
| 35 |
Fri Jan 01 00:00:39 2010 +0000: 182440 KiB |
| 36 |
... |
| 37 |
|
| 38 |
Approximately 11MiB/month of growth in the packfile. |
| 39 |
|
| 40 |
Is the packfile of the kernel sources an acceptable size? |
| 41 |
It's presently ~800MiB. If we start with zero or minimal history (6 |
| 42 |
months maybe). This gives us a fairly small tree... |
| 43 |
|
| 44 |
Still needed with the above: |
| 45 |
- Document _very_ well how to graft history back together if you want |
| 46 |
the full history. |
| 47 |
- Prevent full history from being pushed back. |
| 48 |
|
| 49 |
-- |
| 50 |
Robin Hugh Johnson |
| 51 |
Gentoo Linux: Developer, Trustee & Infrastructure Lead |
| 52 |
E-Mail : robbat2@g.o |
| 53 |
GnuPG FP : 11AC BA4F 4778 E3F6 E4ED F38E B27B 944E 3488 4E85 |
Archives