Re: Surely 'bzr branch' shouldn't be this slow?

[Jason Earl <jearl@notengoamigos.org>]

Lennart Borgman <lennart.borgman@gmail.com> writes:

> On Thu, Jan 7, 2010 at 10:48 PM, Jason Earl <jearl@notengoamigos.org> wrote:
>> Lennart Borgman <lennart.borgman@gmail.com> writes:
>>
>>> On Thu, Jan 7, 2010 at 8:54 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>>>>> From: Lennart Borgman <lennart.borgman@gmail.com>
>>>>> Date: Thu, 7 Jan 2010 09:37:15 +0100
>>>>> Cc: emacs-devel@gnu.org
>>>>>
>>>>> Just a comment: I have not even tried yet to use bzr. According to
>>>>> what I am reading it looks impossible at the moment.
>>>>>
>>>>> Am I right or?
>>>>
>>>> It's both possible and practical.  I use it on 2 different Windows
>>>> machines and on 1 GNU/Linux one, and it works quite well.  The initial
>>>> "bzr branch" takes a long time, but that's all.
>>>
>>>
>>> And with a 2Mbit/s connection and an Alan style pc, 1GB RAM?
>>
>> I use it with a netbook with 1GB of Ram and no swap.  It works fine.  I
>> will admit that I have switched to pulling from launchpad, but I did my
>> initial pull from Savannah.
>
> How long did the initial pull take on this machine? (Sorry if you have
> told already. Are the figures perhaps on the wiki?) How fast is your
> internet?

Just for fun I did it again into a new repository.  While there were
times when my netbook struggled, for the most part it appeared that my
crappy wireless network connection was the bottleneck.

time bzr branch http://bzr.savannah.gnu.org/r/emacs/trunk/ trunk
Branched 99273 revision(s).                                                                

real    56m30.346s
user    34m10.160s
sys     0m32.638s

Then I tested to see how long it took to see if there were more
revisions.  There weren't any.

time bzr pull
Using saved parent location: http://bzr.savannah.gnu.org/r/emacs/trunk/
No revisions to pull.                                                                      

real    0m8.109s
user    0m1.672s
sys     0m0.272s

This is on a wireless network.

> And doing the initial pull from Launchpad instead how much faster is it?

Launchpad actually took at little longer:

time bzr pull --remember lp:emacs
No revisions to pull.                                                                      

real    0m10.246s
user    0m1.108s
sys     0m0.180s

The advantage of using launchpad is that you will never get the
pathologically bad updates where bzr pulls down 100M of data to make 2M
worth of changes.  The disadvantage is that it is a mirror that updates
only every 8 hours.

Jason