Re: vc-print-log vs. bzr log

[Stephen Berman]

On Sat, 15 Sep 2012 19:28:53 +0300 Eli Zaretskii <address@hidden> wrote:

>> From: Stephen Berman <address@hidden>
>> Cc: address@hidden
>> Date: Sat, 15 Sep 2012 18:04:24 +0200
>> 
>> Here's a comparison between the shell command with M-!:
>> 
>> Sat 2012-09-15 16:46:33 +0200
>> 0.182  bazaar version: 2.5.1
>> 0.182 bzr arguments: [u'log', u'-r-1',
>> u'/data/steve/bzr/emacs/quickfixes/lisp/gnus/gnus-group.el']
>> 0.186  looking for plugins in /home/steve/.bazaar/plugins
>> 0.196  looking for plugins in 
>> /usr/lib64/python2.7/site-packages/bzrlib/plugins
>> 0.226  looking for plugins in /usr/lib/python2.7/site-packages/bzrlib/plugins
>> 0.240  encoding stdout as osutils.get_user_encoding() 'utf-8'
>> 0.309  opening working tree '/data/steve/bzr/emacs/quickfixes'
>> 0.417  encoding stdout as osutils.get_user_encoding() 'utf-8'
>> 0.480  return code 0
>> 
>> and `C-u C-x v l RET RET' on the same file:
>> 
>> Sat 2012-09-15 17:56:19 +0200
>> 0.167  bazaar version: 2.5.1
>> 0.167  bzr arguments: [u'log', u'-l', u'1', u'gnus-group.el']
>> 0.171  looking for plugins in /home/steve/.bazaar/plugins
>> 0.179  looking for plugins in 
>> /usr/lib64/python2.7/site-packages/bzrlib/plugins
>> 0.203  looking for plugins in /usr/lib/python2.7/site-packages/bzrlib/plugins
>> 0.211  encoding stdout as osutils.get_user_encoding() 'utf-8'
>> 0.277  opening working tree '/data/steve/bzr/emacs/quickfixes'
>> 0.359  encoding stdout as osutils.get_user_encoding() 'utf-8'
>> 18.561  return code 0
>> 
>> What is happening between the last two entries that takes 18 seconds?
>
> That's when bzr does the actual job of accessing the branch meta-data
> and getting the information you asked for.
>
> Do you see the above in "emacs -Q" as well?

Yes, and the difference is even a bit larger:

Sat 2012-09-15 19:21:08 +0200
0.170  bazaar version: 2.5.1
0.171  bzr arguments: [u'log', u'-r-1', 
u'/data/steve/bzr/emacs/quickfixes/lisp/gnus/gnus-group.el']
0.174  looking for plugins in /home/steve/.bazaar/plugins
0.182  looking for plugins in /usr/lib64/python2.7/site-packages/bzrlib/plugins
0.206  looking for plugins in /usr/lib/python2.7/site-packages/bzrlib/plugins
0.217  encoding stdout as osutils.get_user_encoding() 'utf-8'
0.278  opening working tree '/data/steve/bzr/emacs/quickfixes'
0.367  encoding stdout as osutils.get_user_encoding() 'utf-8'
0.419  return code 0

Sat 2012-09-15 19:21:50 +0200
0.203  bazaar version: 2.5.1
0.203  bzr arguments: [u'log', u'-l', u'1', u'gnus-group.el']
0.207  looking for plugins in /home/steve/.bazaar/plugins
0.215  looking for plugins in /usr/lib64/python2.7/site-packages/bzrlib/plugins
0.239  looking for plugins in /usr/lib/python2.7/site-packages/bzrlib/plugins
0.247  encoding stdout as osutils.get_user_encoding() 'utf-8'
0.309  opening working tree '/data/steve/bzr/emacs/quickfixes'
0.395  encoding stdout as osutils.get_user_encoding() 'utf-8'
19.272  return code 0


> What do you see in ~/.bzr.log if you invoke
>
>   bzr log -l1 gnus-group.el
>
> from the shell prompt?  

Sat 2012-09-15 19:26:14 +0200
0.127  bazaar version: 2.5.1
0.127  bzr arguments: [u'log', u'-l1', u'gnus-group.el']
0.131  looking for plugins in /home/steve/.bazaar/plugins
0.139  looking for plugins in /usr/lib64/python2.7/site-packages/bzrlib/plugins
0.163  looking for plugins in /usr/lib/python2.7/site-packages/bzrlib/plugins
0.171  encoding stdout as sys.stdout encoding 'UTF-8'
0.228  opening working tree '/data/steve/bzr/emacs/quickfixes'
0.312  encoding stdout as sys.stdout encoding 'UTF-8'
18.968  Transferred: 0kB (0.0kB/s r:0kB w:0kB)
18.968  return code 0

>                         If you see the same 18 sec, does it help to
> say
>
>   bzr --no-plugins log -l1 gnus-group.el
>
> instead?

No, it's even worse:

Sat 2012-09-15 19:26:56 +0200
0.155  bazaar version: 2.5.1
0.155  bzr arguments: [u'--no-plugins', u'log', u'-l1', u'gnus-group.el']
0.168  encoding stdout as sys.stdout encoding 'UTF-8'
0.243  opening working tree '/data/steve/bzr/emacs/quickfixes'
0.328  encoding stdout as sys.stdout encoding 'UTF-8'
19.122  Transferred: 0kB (0.0kB/s r:0kB w:0kB)
19.122  return code 0

In any case, obviously this is a bzr issue, not an Emacs one.  Or can we
make VC also get the quicker bzr -r-1 results?

Steve Berman