Re: Moving to bzr?

[dhruva]

Hello,

On Mon, Jan 5, 2009 at 3:18 PM, Lennart Borgman
<address@hidden> wrote:
> On Mon, Jan 5, 2009 at 4:50 AM, Stephen J. Turnbull
> <address@hidden> wrote:
>> Eli Zaretskii writes:
>>
>>  > Is "bzr pull" the equivalent of "cvs up -d"?  That is, is that the
>>  > command to resync with the master repository?  Because if it is, it is
>>  > slower than CVS by a large margin (but so is git's 3 min, so I assume
>>  > "bzr pull" is not the equivalent of "cvs up -d").
>>
>> Are you testing on Windows?  git has historically had performance
>> problems on Windows because its Unix-oriented optimizations are often
>> pessimizations on Windows.
>
> Does this mean bzr is unusable for w32 users (for a large project like Emacs)?

I think Stephen was commenting on m$ port of git. I have been using
MSYS port of git for doing my official work and pull emacs. I have
never had any problems (and hence unsubscribed myself from their
mailing list). However, I remember one posting on #git about msys port
of git not able to support very large repositories (in gigabytes) and
emacs is far from that. The cygwin port does not have any such issues
I was told. So, between cygwin and msys port, you are all set to use a
working and usable git for serious work. One missing feature in msys
git is ability to run the git daemon server, cygwin supports that.

I am going to collect the output of 'timeit bzr.bat pull' which is
equivalent of 'time bzr pull' and post the results somewhere on the
web (need to figure out).

Also, I have a pretty high end laptop (IBM Thinkpad T61 with Intel Duo
(dual core) and 2GB RAM. It is not loaded as I do all my development
using a putty terminal connected to a GNU/Linux box. So, resource is
not an issue.

The sample output of 'timeit bzr.bat pull' looks like this:

Using saved parent location: http://bzr.notengoamigos.org/emacs/trunk/
Now on revision 95263.

Version Number:   Windows NT 5.1 (Build 2600)
Exit Time:        4:53 pm, Monday, January 5 2009
Elapsed Time:     0:04:59.984
Process Time:     0:00:00.046
System Calls:     6639636
Context Switches: 1925320
Page Faults:      299443
Bytes Read:       185970981
Bytes Written:    25746978
Bytes Other:      2649061

From:
95262 lektu     2009-01-05
      Fix typos.
Current:
95263 gm        2009-01-05
      Add 2009 to copyright years.

So, it was 1 change set! The memory usage was high too (I have not
logged it now). I can get perfmon logs for better analysis if
required.

Now, git (pulls and updates the local folder too) with all branches:

From:
commit 7b8942ecec62129282ab75ca8bc009618ec34124
Author: Glenn Morris <address@hidden>
Date:   Thu Dec 18 03:34:16 2008 +0000

    Fix reStructuredText funky capitalization.

To:
commit 5b9823795d0ec55a7a114f9fed93f773a8546908
Author: Martin Rudalics <address@hidden>
Date:   Mon Jan 5 10:29:41 2009 +0000

    (x_set_frame_parameters): Make sure height (width) get
    applied when fullwidth (fullheight) is set.  (Bug#1522)

Version Number:   Windows NT 5.1 (Build 2600)
Exit Time:        5:04 pm, Monday, January 5 2009
Elapsed Time:     0:03:11.531
Process Time:     0:00:00.031
System Calls:     4480504
Context Switches: 1324154
Page Faults:      508523
Bytes Read:       565680562
Bytes Written:    102819912
Bytes Other:      1241955

I will start posting the details and hope it helps in deciding using
more scientific approach.

-dhruva

-- 
Contents reflect my personal views only!