[Scons-dev] Optimizing SCons...

[Mark A. Flacy]

On Sunday, December 02, 2012 06:56:02 PM Dirk Bächle wrote:

> Hi Gary,

> 

> On 02.12.2012 17:58, Gary Oberbrunner wrote:

> > This looks very interesting.  Speed and memory use are two "hot

> > button" issues for many SCons users.

> > 

> > What does it do that would break existing projects?  Is it the not

> > storing of full paths?  (When were slots introduced?  2.2?  In that

> > case we're fine on that front.)

> 

> all the path attributes for File nodes ("abspath", "labspath" ...) have

> now to be retrieved via functions like "get_abspath()", because they

> might get computed on the fly.

> They usually get accessed directly in old code...and this is also the

> recommended method in all the documents.


Why can't we just turn those path attributes in the File nodes to be 
properties?  http://docs.python.org/2/library/functions.html#property



> 

> This change is the last in line, so it can be easily omitted for a

> start...it brings just a few percent anyway.

> 

> Regarding the usage of slots we have to keep the following in mind: it

> makes extending SCons a little bit more difficult. You can't simply slap

> new attributes and functions on a class like SCons.Node anymore, but

> have to subclass it instead.

> Multiple inheritance is not possible anymore for the "slotted"

> classes...so we'd lose some flexibility for SCons as a build system

> framework.

> 

> Regards,

> 

> Dirk

> 

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