Whygitisbetterthan.com, some advocacy from GitHub

[Scott Chacon]

Hey,

On Tue, Dec 2, 2008 at 1:04 AM, Martin Pool <mbp at canonical.com> wrote:
> On Tue, Dec 2, 2008 at 7:28 PM, Eugene Wee <crystalrecursion at gmail.com> wrote:
>> Hi,
>>
>> I think you missed out "Git is small" as the 4th area. I am not sure what to
>> make of it though. Another comparison made just over half a year ago had
>> Bazaar win in this department, so did Git make a huge improvement in this
>> area over the past half a year, or was the comparison (unintentionally)
>> rigged in Git's favour?
>
> In the respective current formats, git re-deltas files when repacking
> and we do not, we just reorganize and reindex the existing deltas
> (iiuc).  We're working on rediffing them in the brisbane-core project,
> and that might be where the numbers came from.
>
>> Also, did the author detect a bug? I note the comment that "the second Bzr
>> number is after I ran 'bzr pack', which I thought would make it smaller, but
>> ended up making it much, much larger for some reason."
>
> The pack command does not delete the just-obsoleted pack files, in
> case they're still in use by eg an http client.   In fact, I think
> they're never automatically deleted at present, and they should be
> <https://lists.ubuntu.com/archives/bazaar/2008q1/036740.html>
> <https://bugs.edge.launchpad.net/bzr/+bug/304320>
>
> The one I find most unlikely (and may be inadvertent measurement
> error) is actually the working tree operations like status and diff,
> where he claims over 14s and for me it's under 300ms.  That's in a new
> copy of that django branch, using bzr 1.10, with a small change to one
> file.  Tag is about 200ms.  I would guess maybe he's running from
> python source without the extensions built.

If it's helpful, I'm on a Mac and did this using whatever was
installed with the Mac installer.

$ bzr --version
Bazaar (bzr) 1.9

I didn't set out to make Git look better than it is - but I am not
great at bzr (a bit better at hg), so if you want to share some tips,
I'd be happy to change the benchmarks.  I even tried to 'pack',
thinking it would help the bzr numbers.  Let me know if there are some
tips and I'll update the numbers.

Thanks!

Scott

(btw, since these are all canonical emails - i just bought a dell mini
9 and love the ubuntu - good job all...)

> --
> Martin <http://launchpad.net/~mbp/>
>