Hello there,
as has been pre-announced at
https://pairlist4.pair.net/pipermail/scons-users/2014-July/002734.html
and
https://pairlist2.pair.net/pipermail/scons-dev/2014-December/002107.html
we're still planning to switch the Node class to using slots in the core sources, mainly for reducing the overall memory
consumption by up to 35% in large build projects.
We have now pushed a new branch named switch_to_slots to the main SCons repo, and ran it against our test suite in Buildbot (
http://buildbot.scons.org/waterfall ). So far, the implementation looks stable and for the normal user there shouldn't be any danger
of scripts/builds breaking after an update to the new release 2.4 (coming probably in a month or so).
However, if you write and maintain your own extensions, where you regularly reach into the bowels of SCons to extract internal data
or to override methods (monkey-patching), there is a chance that you'll get bitten by the changes as described in the appendix below.
We invite any interested user/developer to try out the current slots branch,
by cloning
hg clone http://bitbucket.org/scons/scons -r switch_to_slots
to a local folder (not your standard SCons repo!), and starting it via the
bootstrap.py script:
python ~/try_out_folder/scons/bootstrap.py
Please report back any errors or inconveniences that you find, such that we can
work on a solution together.
If you have further questions, better ask them now. We won't look back after
merging this. ;)
Best regards,
Dirk
Appendix: Short list of changes to the Node* classes
- Introduction of decorators for memoizer debugging/counting (we can't
use metaclasses anymore).
- Adding interface for accessing node attributes that may get
initialized lazily:
t.abspath - t.get_abspath()
t.labspath - t.get_labspath()
t.tpath - t.get_tpath()
t.path_elements - t.get_path_elements()
t.path - t.get_internal_path()
- Methods like t.exists(), t.rexists() and t.get_contents() can't be
re-assigned directly anymore. They'll be realized via function maps
internally ( {int : func} ).
- NodeInfo and BuildInfo will also get switched to __slots__, and get a
new internal version number (1.0 - 2.0). This means that after the
switch *all* targets are regarded to be out-of-date on the first build.
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