[Scons-users] SCons very slow on GitHub actions

[Bill Deegan]

Curious. Have you tried to compare the runtimes of each of the examples?
I wouldn't be surprised if one of the examples shows a much larger
difference in runtime than the others

Ok. I took a look.
Chances are the tests which are missing:

# Skip initializing any tools in the DefaultEnvironment
# as we're not using it.
DefaultEnvironment(tools=[])

Are the ones taking much longer on Windows.
This is because when SCons starts up it initializes the
DefaultEnvironment(), in particular MSVC initialization is low.
The above code tell's SCons basically we're not going to use it, so don't
initialize it.

There's also some logic to cache the MSVC initialization which could be
turned on.

Add this to your github actions .yml file:
env:
    SCONS_CACHE_MSVC_CONFIG: 1

In general the scons-examples are meant to be simple examples of different
SCons usage.
Not the most optimized for build time, as for some users this isn't an
issue for a simple build.
(especially if they're not on windows)

I just made a PR with these changes.
https://github.com/SCons/scons-examples/pull/8

I'll merge them, and then you can rebase/merge into your PR and let us know
if that improves things.


-Bill

On Mon, Apr 28, 2025 at 5:57 AM Mats Wichmann <mats at wichmann.us> wrote:

> On 4/28/25 07:42, Leonard de Ruijter wrote:
> > Dear Mats,
> >
> >
> > Thanks for your quick reply.
> >
> > You can find comparison times in https://github.com/LeonarddeR/scons-
> > examples/actions/runs/14706591575
> >
> > This uses the workflow file found in https://github.com/SCons/scons-
> > examples/pull/7
>
> as an aside, I see several of the packaging examples are broken. We
> moved most of these out of the manpage a while back to better align
> where things were done.  I've seen that tag attribute error before...
> suppose I should go poke at those again someday.
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