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Subject: bug#69314: [PATCH] Speed up stage0 bootstrap build using prebuilts
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Dear Guile maintainers,

please consider below patch to speed up the build from release tarballs
that include prebuilt bytecode.

Jonas

On Thu, 2024-01-04 at 11:57 +0100, Jonas Hahnfeld wrote:
> From 95f15821c535537c7ad4fdae1988855314d56ece Mon Sep 17 00:00:00 2001
> From: Jonas Hahnfeld <hahnjo@HIDDEN>
> Date: Thu, 4 Jan 2024 11:44:55 +0100
> Subject: [PATCH] Speed up stage0 bootstrap build using prebuilts
>=20
> Use prebuilt bytecode of ice-9/eval.go and others for all of stage0,
> it is optimized and evaluation is much faster. In my environment,
> this speeds up the build of guile-3.0.9 from around 29 minutes to
> only 19 minutes.
>=20
> * meta/build-env.in: In stage0, prefer prebuilt bytecode over just
> compiled stage0 files.
> ---
>  meta/build-env.in | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>=20
> diff --git a/meta/build-env.in b/meta/build-env.in
> index bdc88ded4..446a536af 100644
> --- a/meta/build-env.in
> +++ b/meta/build-env.in
> @@ -58,7 +58,7 @@ then
>      fi
>      export GUILE_LOAD_PATH
>      case "$GUILE_BOOTSTRAP_STAGE" in
> -        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage0:${top=
_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@" ;;
> +        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_srcdir}/prebuilt/@SCM_=
PREBUILT_BINARIES@:${top_builddir}/stage0" ;;
>          stage1) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage1:${top=
_builddir}/stage0" ;;
>          stage2) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage1" ;;
>          *) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage2:${top_buil=
ddir}/guile-readline" ;;


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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Jonas Hahnfeld <hahnjo@HIDDEN>
Subject: bug#69314: Acknowledgement ([PATCH] Speed up stage0 bootstrap
 build using prebuilts)
Message-ID: <handler.69314.B.170863531625052.ack <at> debbugs.gnu.org>
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Message sent to bug-guile@HIDDEN:

Subject: bug#69314: [PATCH] Speed up stage0 bootstrap build using prebuilts
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
In-Reply-To: <41b70293a61ce187c698097462c16cac5d2ac40f.camel@HIDDEN> (Jonas
 Hahnfeld's message of "Thu, 22 Feb 2024 21:09:00 +0100")
References: <3d661a13764a90cfadc6772271da87d02e1cd833.camel@HIDDEN>
 <41b70293a61ce187c698097462c16cac5d2ac40f.camel@HIDDEN>
Date: Mon, 06 May 2024 11:34:33 +0200
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Hi Jonas,

Jonas Hahnfeld <hahnjo@HIDDEN> skribis:

> On Thu, 2024-01-04 at 11:57 +0100, Jonas Hahnfeld wrote:
>> From 95f15821c535537c7ad4fdae1988855314d56ece Mon Sep 17 00:00:00 2001
>> From: Jonas Hahnfeld <hahnjo@HIDDEN>
>> Date: Thu, 4 Jan 2024 11:44:55 +0100
>> Subject: [PATCH] Speed up stage0 bootstrap build using prebuilts
>>=20
>> Use prebuilt bytecode of ice-9/eval.go and others for all of stage0,
>> it is optimized and evaluation is much faster. In my environment,
>> this speeds up the build of guile-3.0.9 from around 29 minutes to
>> only 19 minutes.
>>=20
>> * meta/build-env.in: In stage0, prefer prebuilt bytecode over just
>> compiled stage0 files.
>> ---
>>  meta/build-env.in | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>=20
>> diff --git a/meta/build-env.in b/meta/build-env.in
>> index bdc88ded4..446a536af 100644
>> --- a/meta/build-env.in
>> +++ b/meta/build-env.in
>> @@ -58,7 +58,7 @@ then
>>      fi
>>      export GUILE_LOAD_PATH
>>      case "$GUILE_BOOTSTRAP_STAGE" in
>> -        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage0:${to=
p_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@" ;;
>> +        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_srcdir}/prebuilt/@SCM=
_PREBUILT_BINARIES@:${top_builddir}/stage0" ;;

I don=E2=80=99t understand why changing the order would make a difference.
Surely if .go files are available under prebuilt/, they=E2=80=99ll be found,
even if that directory comes second?  Or am I missing something?

Thanks for the patch!

Ludo=E2=80=99.

Message sent to bug-guile@HIDDEN:

Subject: bug#69314: [PATCH] Speed up stage0 bootstrap build using prebuilts
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From: Jonas Hahnfeld <hahnjo@HIDDEN>
Date: Mon, 06 May 2024 21:12:44 +0200
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On Mon, 2024-05-06 at 11:34 +0200, Ludovic Court=C3=A8s wrote:
> Hi Jonas,
>=20
> Jonas Hahnfeld <hahnjo@HIDDEN> skribis:
>=20
> > On Thu, 2024-01-04 at 11:57 +0100, Jonas Hahnfeld wrote:
> > > From 95f15821c535537c7ad4fdae1988855314d56ece Mon Sep 17 00:00:00 200=
1
> > > From: Jonas Hahnfeld <hahnjo@HIDDEN>
> > > Date: Thu, 4 Jan 2024 11:44:55 +0100
> > > Subject: [PATCH] Speed up stage0 bootstrap build using prebuilts
> > >=20
> > > Use prebuilt bytecode of ice-9/eval.go and others for all of stage0,
> > > it is optimized and evaluation is much faster. In my environment,
> > > this speeds up the build of guile-3.0.9 from around 29 minutes to
> > > only 19 minutes.
> > >=20
> > > * meta/build-env.in: In stage0, prefer prebuilt bytecode over just
> > > compiled stage0 files.
> > > ---
> > >  meta/build-env.in | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >=20
> > > diff --git a/meta/build-env.in b/meta/build-env.in
> > > index bdc88ded4..446a536af 100644
> > > --- a/meta/build-env.in
> > > +++ b/meta/build-env.in
> > > @@ -58,7 +58,7 @@ then
> > >      fi
> > >      export GUILE_LOAD_PATH
> > >      case "$GUILE_BOOTSTRAP_STAGE" in
> > > -        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage0:$=
{top_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@" ;;
> > > +        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_srcdir}/prebuilt/@=
SCM_PREBUILT_BINARIES@:${top_builddir}/stage0" ;;
>=20
> I don=E2=80=99t understand why changing the order would make a difference=
.
> Surely if .go files are available under prebuilt/, they=E2=80=99ll be fou=
nd,
> even if that directory comes second?  Or am I missing something?

Yes, they are found but with lower priority. As I try to explain in the
commit message (could be improved though), the same bytecode is also
built during stage0, but without optimizations which makes the rest of
stage0 awfully slow.

Jonas

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From: Simon Tournier <zimon.toutoune@HIDDEN>
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Date: Tue, 07 May 2024 18:21:01 +0200
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Hi Ludo,

On lun., 06 mai 2024 at 11:34, Ludovic Court=C3=A8s <ludo@HIDDEN> wrote:

>>> -        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage0:${t=
op_srcdir}/prebuilt/@SCM_PREBUILT_BINARIES@" ;;
>>> +        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_srcdir}/prebuilt/@SC=
M_PREBUILT_BINARIES@:${top_builddir}/stage0" ;;
>
> I don=E2=80=99t understand why changing the order would make a difference.
> Surely if .go files are available under prebuilt/, they=E2=80=99ll be fou=
nd,
> even if that directory comes second?  Or am I missing something?

Well, depending on what had been built before, it might read:

--8<---------------cut here---------------start------------->8---
$ ls -1 {stage0,prebuilt/x86_64-unknown-linux-gnu}/ice-9/{boot-9,eval,psynt=
ax-pp}.go
prebuilt/x86_64-unknown-linux-gnu/ice-9/boot-9.go
prebuilt/x86_64-unknown-linux-gnu/ice-9/eval.go
prebuilt/x86_64-unknown-linux-gnu/ice-9/psyntax-pp.go
stage0/ice-9/boot-9.go
stage0/ice-9/eval.go
stage0/ice-9/psyntax-pp.go
--8<---------------cut here---------------end--------------->8---

Therefore, the order in GUILE_LOAD_COMPILED_PATH matters, no?

Somehow, similarly as:

        stage1) GUILE_LOAD_COMPILED_PATH=3D"${top_builddir}/stage1:${top_bu=
ilddir}/stage0" ;;

I would set the expected most optimized first, such that:

        stage0) GUILE_LOAD_COMPILED_PATH=3D"${top_srcdir}/prebuilt/@SCM_PRE=
BUILT_BINARIES@:${top_builddir}/stage0" ;;

assuming =E2=80=99prebuilt=E2=80=99 provides something more optimized than =
=E2=80=99stage0=E2=80=99.


Cheers,
simon

Last modified: Tue, 7 May 2024 19:00:02 UTC

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