Large source tree performance

[John Arbash Meinel]

Andrew Nguyen wrote:
> I had found a page detailing some benchmarks with the linux kernel tree
> but can't seem to find it again - does anyone have a link handy?  What I
> really wanted to do was compare the numbers against what I observed to
> see if there is anything wrong with my system setup.  I ran the
> following commands and have annotated them with respective times:
> 
> cd linux-2.6.18.1
> bzr init
> bzr add
> bzr ci  (unk time taken)
> bzr add (unk time taken)
> bzr push /bzr/testpush  (local filesystem, 33min)
> cd ..
> bzr branch /bzr/testpush testbranch (18min)
> 
> Is this typical?  I am really excited about bazaar (currently using
> subversion) but would like to know if the performance hit lies in my
> system setup or with bazaar.  However, things are getting much better
> since the above operations failed to complete (after 4 hours) with the
> Ubuntu version of bazaar (0.8.?)
> 
> Thanks,
> Andrew
> 

What version of bzr are you running? We have pages like this:
http://bazaar-vcs.org/Performance/0.9
http://bazaar-vcs.org/Performance/0.10
http://bazaar-vcs.org/Performance/0.11
(the 0.12 one doesn't have any specific changes for add and commit
performance)

I also would guess that you didn't 'bzr add' after you 'bzr ci'...

Do you have the specs for your machine? A lot of it probably depends on
how much data it can cache, versus hitting swap or reading the hard-drive.

Those performance benchmarks were run on my machine, which does have a
lot of RAM.

However, on this machine 'bzr branch . ../other-branch' does take 15min
if they are not sharing a repository. Definitely something worth looking
into.

John
=:->

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