RFC: startup time - again

[John Arbash Meinel]

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David Cournapeau wrote:
> John Arbash Meinel wrote:
>>
>> Fixing import times tends to be Whack-a-mole because making one module
>> lazily import things it doesn't need, just shows another one in the
>> chain that *does the same thing*.
> 
> Yes, I know it is quite frustrating, and not so easy  to fix in python.
> It takes quite some time to get to a certain stage, and it takes one
> line to get back to square one.
> 
> Going back to hg vs bzr, are the mechanisms for lazy import in hg and
> bzr vastly different ? Or the difference mostly lies in some modules
> that bzr depends on and hg does not ?
> 
> cheers,
> 
> David
> 

hg doesn't have the level of abstraction that bzr does. They pretty much
only support 1 repository layout (2 if you count the old 'revlog' versus
'revlog-ng' stuff.)

The basic lazy import mechanism is similar, though the syntax is
different. (I wrote lazy_import to allow you to use standard python
syntax, they use a custom syntax.)

There are some other, mostly minor, things.

Oh, and by default they don't load plugins unless users explicitly
update their 'hgrc' files. So installing a plugin doesn't make it
available until a user does something manually.

John
=:->

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