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15.20.9723.018; Tue, 17 Mar 2026 10:59:17 +0000 Content-Type: multipart/alternative; boundary="------------cq9efhshDMFccnhAv0c48exj" Message-ID: <5864101b-3548-43dc-8b98-cc65f28e1a2e@windriver.com> Date: Tue, 17 Mar 2026 16:29:10 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [OE-core] [PATCH V2] rust: Enable parallel-frontend-threads To: openembedded-core@lists.openembedded.org, Mathieu Dubois-Briand References: <20260313060226.2354003-1-sundeep.kokkonda@windriver.com> Content-Language: en-US Cc: Randy MacLeod From: Sundeep KOKKONDA In-Reply-To: X-ClientProxiedBy: MN2PR01CA0046.prod.exchangelabs.com (2603:10b6:208:23f::15) To CH3PR11MB8443.namprd11.prod.outlook.com (2603:10b6:610:1bd::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR11MB8443:EE_|SA0PR11MB4766:EE_ X-MS-Office365-Filtering-Correlation-Id: 049c84a3-d036-455c-de24-08de84143ba9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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lists.openembedded.org wrot= e: > CAUTION: This email comes from a non Wind River email account! > Do not click links or open attachments unless you recognize the sender = and know the content is safe. > > On Fri Mar 13, 2026 at 7:02 AM CET, Sundeep KOKKONDA via lists.openembe= dded.org wrote: >> From: Sundeep KOKKONDA >> >> Enabled the parallel-frontend-threads for faster compilation of rust c= ode. >> >> Test Results: >> A few tests (bitbake rust) ran by with and without enabling this optio= n. >> - Machine config: Intel(R) Xeon(R) CPU E5-4669 v3 @ 2.10GHz with 144 C= PUs. >> - Avg. default build time (w/o this option) - 56m 50.104s >> - Avg. build time with this option - 49m 17.224s >> - Performance Difference - 7m 32.880s faster builds (=E2=89=88 13.3%) >> >> parallel-frontend-threads is limited to a max of 8 for best results. >> More info -https://blog.rust-lang.org/2023/11/09/parallel-rustc/ >> >> Signed-off-by: Sundeep KOKKONDA >> --- > Hi Sundeep, > > It looks like this is causing some reproducibility issues: > > AssertionError: The following deb packages are different and not in exc= lusion list: > /srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-e= xtended/tmp/deploy/deb/./x86-64-v3/rust-dbg_1.94.0-r0_amd64.deb > /srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-e= xtended/tmp/deploy/deb/./x86-64-v3/rust_1.94.0-r0_amd64.deb > The following ipk packages are different and not in exclusion list: > /srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-e= xtended/tmp/deploy/ipk/./x86-64-v3/rust-dbg_1.94.0-r0_x86-64-v3.ipk > /srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-e= xtended/tmp/deploy/ipk/./x86-64-v3/rust_1.94.0-r0_x86-64-v3.ipk > The following rpm packages are different and not in exclusion list: > /srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-e= xtended/tmp/deploy/rpm/./x86_64_v3/rust-1.94.0-r0.x86_64_v3.rpm > /srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-e= xtended/tmp/deploy/rpm/./x86_64_v3/rust-dbg-1.94.0-r0.x86_64_v3.rpm > > Diffoscope output is here: > https://valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260313-gl43m= wtc/packages/diff-html/ > > Can you have a look at it? Hello, I am able to reproduce the issue. I see the=20 /librustc_driver-3a7e57d3c38387b5.so/ has changed between the builds.=20 The 'BuildID' is different in both .so files which is happening due to a=20 difference in .gnu_debuglink section. I am further analyzing how this option is affecting this section. Thanks, Sundeep K. > Thanks, > Mathieu > > -- > Mathieu Dubois-Briand, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com > > > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > Links: You receive all messages sent to this group. > View/Reply Online (#233071):https://lists.openembedded.org/g/openembedd= ed-core/message/233071 > Mute This Topic:https://lists.openembedded.org/mt/118293063/7677583 > Group Owner:openembedded-core+owner@lists.openembedded.org > Unsubscribe:https://lists.openembedded.org/g/openembedded-core/unsub [s= undeep.kokkonda@eng.windriver.com] > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > --------------cq9efhshDMFccnhAv0c48exj Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 62H4fECI1352420


On 14-Mar-26 12:24, Mathieu Dubois-Briand via lists.openembedded.org wrote:
CAUTION: This email comes fr=
om a non Wind River email account!
Do not click links or open attachments unless you recognize the sender an=
d know the content is safe.

On Fri Mar 13, 2026 at 7:02 AM CET, Sundeep KOKKONDA via lists.openembedd=
ed.org wrote:

From: Sundeep KOKKONDA <sundeep.kokkonda@windriver.com>

Enabled the parallel-frontend-threads for faster compilation of rust code.

Test Results:
A few tests (bitbake rust) ran by with and without enabling this option.
- Machine config: Intel(R) Xeon(R) CPU E5-4669 v3 @ 2.10GHz with 144 CPUs.
- Avg. default build time (w/o this option) - 56m 50.104s
- Avg. build time with this option - 49m 17.224s
- Performance Difference - 7m 32.880s faster builds (=E2=89=88 13.3%)

parallel-frontend-threads is limited to a max of 8 for best results.
More info - https://blog.rust-lang.org/2023/11/0=
9/parallel-rustc/

Signed-off-by: Sundeep KOKKONDA <sundeep.kokkonda@windriver.co=
m>
---

Hi Sundeep,

It looks like this is causing some reproducibility issues:

AssertionError: The following deb packages are different and not in exclu=
sion list:
/srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-ext=
ended/tmp/deploy/deb/./x86-64-v3/rust-dbg_1.94.0-r0_amd64.deb
/srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-ext=
ended/tmp/deploy/deb/./x86-64-v3/rust_1.94.0-r0_amd64.deb
The following ipk packages are different and not in exclusion list:
/srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-ext=
ended/tmp/deploy/ipk/./x86-64-v3/rust-dbg_1.94.0-r0_x86-64-v3.ipk
/srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-ext=
ended/tmp/deploy/ipk/./x86-64-v3/rust_1.94.0-r0_x86-64-v3.ipk
The following rpm packages are different and not in exclusion list:
/srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-ext=
ended/tmp/deploy/rpm/./x86_64_v3/rust-1.94.0-r0.x86_64_v3.rpm
/srv/pokybuild/yocto-worker/reproducible/build/build-st/reproducibleB-ext=
ended/tmp/deploy/rpm/./x86_64_v3/rust-dbg-1.94.0-r0.x86_64_v3.rpm

Diffoscope output is here:
https:/=
/valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260313-gl43mwtc/packa=
ges/diff-html/

Can you have a look at it?

Hello,

I am able to reproduce the issue. I see the librustc_driver-3a7= e57d3c38387b5.so has changed between the builds. The 'BuildID' is different in both .so files which is happening due to a difference in .gnu_debuglink section.

I am further analyzing how this option is affecting this section.<= /p>


Thanks,

Sundeep K.

Thanks,
Mathieu

--
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://b=
ootlin.com



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