Re: Parallel build when using python build actions

Ivan,

If I understand correctly you have some complicated logic implemented in
python and you want to embed that in SCons?
Generally a bad idea.

You would be better off to write builders which run those externally.
Python doesn't have true threading with python logic due to the GIL.

-Bill


On Tue, Mar 9, 2021 at 2:59 AM Ivan <[email protected]> wrote:

> Hi folks,
>
> I have my custom toolchain written in python. I want to import my
> compiler/linker/assembler modules from the SConstruct file and call them as
> Python functions instead of invoking them as scripts.
>
> I've managed to do that, but it seems that scons only executes one job at
> a time.  Here's my SConstruct:
> https://github.com/imihajlow/ccpu/blob/scons-optimize/app/SConstruct
> Here's what `time scons` outputs for python function actions:
>
> scons  8.80s user 0.77s system 108% cpu 8.807 total
>
> And here's with the normal string actions:
>
> scons  18.92s user 2.88s system 490% cpu 4.440 total
>
> You can see that the CPU time is much lower in the first case, but the
> real time is twice as high because only one core is used.
>
> Am I doing something wrong or is that a bug/feature of scons?
>
> Best regards,
> Ivan
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