RFC: startup time - again

[Aaron Bentley]

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David Cournapeau wrote:
> Matthew D. Fuller wrote:
>> Now, when I wipe out bzrlib/plugins/launchpad, there's that ~100ms
>> back.  So a quarter of the time used by 'bzr rocks' is used in the
>> launchpad plugin.
>>   
> 
> This is not surprising: lp plugin import both xmlrpclib (which is really
> slow to import) and urlparse

xmlrpclib and urlparse are not loaded when commands such as "bzr rocks"
are run.

The lp plugin loads the following:
from bzrlib.branch import Branch
from bzrlib.commands import Command, Option, register_command
from bzrlib.directory_service import directories
from bzrlib.errors import BzrCommandError, NoPublicBranch, NotBranchError
from bzrlib.help_topics import topic_registry

The others are imported only when launchpad-specific functionality is
invoked, such as the lp directory service or the register-branch command.

In my tests, the best bzr rocks time I get is:

without launchpad plugin:
real	0m0.217s
user	0m0.156s
sys	0m0.032s

with launchpad plugin:
real	0m0.217s
user	0m0.180s
sys	0m0.024s

Aaron
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