Re: SCons very slow on GitHub actions

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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=E2=80=AFAM Bill Deegan <bill@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=3D[])
>
> 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 differen=
t
> 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=E2=80=AFAM Mats Wichmann <[email protected]> =
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.
>> _______________________________________________
>> Scons-users mailing list
>> [email protected]
>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>
>

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<div dir=3D"ltr"><div>Is the scons-examples repo your actual issue?</div><d=
iv>Or are you just using this as an example of your real issue?</div><div>I=
f so, please explain.</div></div><br><div class=3D"gmail_quote gmail_quote_=
container"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Apr 28, 2025 at 8:=
30=E2=80=AFAM Bill Deegan &lt;<a href=3D"mailto:[email protected]">=
[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr"><div>Curious. Have you tried to c=
ompare the runtimes of each of the examples?</div><div>I wouldn&#39;t be su=
rprised if one of the examples shows a much larger difference in runtime th=
an the others</div><div><br></div><div>Ok. I took a look.</div><div>Chances=
 are the tests which are missing:</div><div><br></div><div># Skip initializ=
ing any tools in the DefaultEnvironment <br># as we&#39;re not using it.<br=
>DefaultEnvironment(tools=3D[])</div><div><br></div><div>Are the ones takin=
g much longer on Windows.</div><div>This is because when SCons starts up it=
 initializes the DefaultEnvironment(), in particular MSVC initialization is=
 low.</div><div>The above code tell&#39;s SCons basically we&#39;re not goi=
ng to use it, so don&#39;t initialize it.</div><div><br></div><div>There&#3=
9;s also some logic to cache the MSVC initialization which could be turned =
on.</div><div><br></div><div>Add this to your github actions .yml file:</di=
v><div>env:<br>=C2=A0 =C2=A0 SCONS_CACHE_MSVC_CONFIG: 1</div><div><br></div=
><div>In general the scons-examples are meant to be simple examples of diff=
erent SCons usage.</div><div>Not the most optimized for build time, as for =
some users this isn&#39;t an issue for a simple build.</div><div>(especiall=
y if they&#39;re not on windows)</div><div><br></div><div>I just made a PR =
with these changes.</div><div><a href=3D"https://github.com/SCons/scons-exa=
mples/pull/8" target=3D"_blank">https://github.com/SCons/scons-examples/pul=
l/8</a></div><div><br></div><div>I&#39;ll merge them, and then you can reba=
se/merge into your PR and let us know if that improves things.</div><div><b=
r></div><div><br></div><div>-Bill <br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Apr 28, 2025 at 5:57=E2=
=80=AFAM Mats Wichmann &lt;<a href=3D"mailto:[email protected]" target=3D"_b=
lank">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,2=
04);padding-left:1ex">On 4/28/25 07:42, Leonard de Ruijter wrote:<br>
&gt; Dear Mats,<br>
&gt; <br>
&gt; <br>
&gt; Thanks for your quick reply.<br>
&gt; <br>
&gt; You can find comparison times in <a href=3D"https://github.com/Leonard=
deR/scons-" rel=3D"noreferrer" target=3D"_blank">https://github.com/Leonard=
deR/scons-</a> <br>
&gt; examples/actions/runs/14706591575<br>
&gt; <br>
&gt; This uses the workflow file found in <a href=3D"https://github.com/SCo=
ns/scons-" rel=3D"noreferrer" target=3D"_blank">https://github.com/SCons/sc=
ons-</a> <br>
&gt; examples/pull/7<br>
<br>
as an aside, I see several of the packaging examples are broken. We <br>
moved most of these out of the manpage a while back to better align <br>
where things were done.=C2=A0 I&#39;ve seen that tag attribute error before=
... <br>
suppose I should go poke at those again someday.<br>
_______________________________________________<br>
Scons-users mailing list<br>
<a href=3D"mailto:[email protected]" target=3D"_blank">Scons-users@scon=
s.org</a><br>
<a href=3D"https://pairlist4.pair.net/mailman/listinfo/scons-users" rel=3D"=
noreferrer" target=3D"_blank">https://pairlist4.pair.net/mailman/listinfo/s=
cons-users</a><br>
</blockquote></div>
</blockquote></div>

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