[Scons-dev] scons daemon

[William Blevins]

Can you give the time saving using --debug=time for -j1 and -j4?

On Mon, Dec 28, 2015 at 11:49 PM, Schleimer, Ben via Scons-dev <
scons-dev at scons.org> wrote:

> Hi Dirk,
>
> >for which targets exactly would you build the list of source files? All
> of them? Regard, that "." is not always the default
> >target...so you'd have to parse the SConstructs/SConscripts first anyway.
> >In it's current form, the Taskmaster never builds the full DAG beforehand
> (a common misconception among people that suggest a
> >seemingly simple performance "hack", like yours ;) ), but simply expands
> the list of given Targets until all build prerequisites are
> >met. This allows you to shorten compile/update times in large builds by
> specifying a single library/program on the command-line
>
> >only. How would your daemon handle this?
>
> I am taking Bill Deegan's advice and starting by modifying Iteractive.py.
> I think that the standard behavior is great, I just want to tweak it a bit
> to avoid the heaviest scons-induced overhead of the code-run-debug cycle,
> the building of the DAG.
>
>
> My project has 5 SConscript files and 2 SConstruct files and just by using:
> $ scons.py -j4 --interactive
> scons: Reading SConscript files ...
> Building Debug-x86-none/libholo.so in Debug configuration
> Building Debug-x86-none/HoloProcess in Debug configuration
> scons: done reading SConscript files.
> scons>>> build
>
>
> it drops the incremental build time by 0.2 secs.
>
> I'm very curious about what kind of time savings occur on much larger
> projects. I submitted a pull request on bitbucket to automate the build
> inside interactive mode:
>
> https://bitbucket.org/scons/scons/pull-requests/287/added-usr1-signal-handling-to-interactive/diff
>
> Next, inside interactive mode, I'm planning on pulling all of the Nodes
> and watching them and then trying to do background compiles whenever a file
> is changed.
>
> Sincerely
> Ben
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