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15.20.9723.000; Thu, 12 Mar 2026 13:11:26 +0000 Content-Type: multipart/alternative; boundary="------------tTjHmA0PlFY7YuDZF1pZJU6D" Message-ID: <8a0c93d3-d8ce-4ee0-bb08-fbda7e5f1883@windriver.com> Date: Thu, 12 Mar 2026 18:41:12 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [OE-core] [PATCH] rust: Enable parallel-frontend-threads To: Alexander Kanavin , Richard Purdie Cc: openembedded-core@lists.openembedded.org, randy.macleod@windriver.com References: <20260312040703.1487119-1-sundeep.kokkonda@windriver.com> Content-Language: en-US From: Sundeep KOKKONDA In-Reply-To: X-ClientProxiedBy: MA1P287CA0003.INDP287.PROD.OUTLOOK.COM (2603:1096:a00:35::16) To CH3PR11MB8443.namprd11.prod.outlook.com (2603:10b6:610:1bd::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR11MB8443:EE_|DS0PR11MB8761:EE_ X-MS-Office365-Filtering-Correlation-Id: d41318ff-53b7-4f62-f841-08de8038dd71 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 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adultscore=0 suspectscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603120105 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Thu, 12 Mar 2026 13:11:40 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/232950 --------------tTjHmA0PlFY7YuDZF1pZJU6D Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 62C6koPS1844649 On 12-Mar-26 14:32, Alexander Kanavin wrote: > 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 Thu, 12 Mar 2026 at 05:07, Sundeep KOKKONDA via > lists.openembedded.org > wrote: >> Test Results: >> A few tests ran by, with and without enabling this option. >> - 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%) >> >> Tests were performed by setting thread count as 8 & 16 but no much dif= ference is seen. >> So, the parallel-frontend-threads =3D 8 is set. > It would really help to provide specifics. What tests did you run, and > how were the numbers obtained? How can these tests be reproduced? What > CPU was used and how many cores it had? I tested the rust build time with `time bitbake rust` (I wonder how I=20 missed this to put is commit msg) Machine Info: Intel(R) Xeon(R) CPU E5-4669 v3 @ 2.10GHz with 144 CPUs. > >> + config.set("rust", "parallel-frontend-threads", "8") > I'd suggest we don't hardcode a number, but rather set to oe.utils.cpu_= count() > (grep oe-core for examples). I choose 8 here as there is no noticeable difference between 8/16. Also, = the rust blog says (https://blog.rust-lang.org/2023/11/09/parallel-rustc/= ) - /We recommend eight threads because this is the configuration we have=20 tested the most and it is known to give good results. Values lower than=20 eight will see smaller benefits, but are appropriate if your hardware=20 has fewer than eight cores. Values greater than eight will give=20 diminishing returns and may even give worse performance. / Thanks, Sundeep K > > Alex --------------tTjHmA0PlFY7YuDZF1pZJU6D 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 62C6koPS1844649


On 12-Mar-26 14:32, Alexander Kanavin 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 Thu, 12 Mar 2026 at 05:07, Sundeep KOKKONDA via
lists.openembedded.org
<sundeep.kokkonda=3Dwindriver.com@li=
sts.openembedded.org> wrote:

Test Results:
A few tests ran by, with and without enabling this option.
- 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%)

Tests were performed by setting thread count as 8 & 16 but no much di=
fference is seen.
So, the parallel-frontend-threads =3D 8 is set.

It would really help to provide specifics. What tests did you run, and
how were the numbers obtained? How can these tests be reproduced? What
CPU was used and how many cores it had?

I tested the rust build time with `time bitbake rust` (I wonder how I missed this to put is commit msg)

Machine Info: Intel(R) Xeon(R) CPU E5-4669 v3 @ 2.10GHz with 144 CPUs.



+    config.set("rust=
", "parallel-frontend-threads", "8")

I'd suggest we don't hardcode a number, but rather set to oe.utils.cpu_co=
unt()
(grep oe-core for examples).
I choose 8 here as there is no=
 noticeable difference between 8/16. Also, the rust blog says (https://blog.rust-lang.org/2023/11/09/parallel-rustc/) =
-=20

We recommend eight threads because this is the configuration we have t=
ested the most and it is known to give good results. Values lower than ei=
ght will see smaller benefits, but are appropriate if your hardware has f=
ewer than eight cores. Values greater than eight will give diminishing re=
turns and may even give worse performance.


Thanks,
Sundeep K

Alex
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