[Scons-users] SCons very slow on GitHub actions

[Bill Deegan]

Is the scons-examples repo your actual issue?
Or are you just using this as an example of your real issue?
If so, please explain.

On Mon, Apr 28, 2025 at 8:30 AM Bill Deegan <bill at baddogconsulting.com>
wrote:

> 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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>>
>
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