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15.21.0181.014; Tue, 14 Jul 2026 21:33:06 +0000 Content-Type: multipart/alternative; boundary="------------zXbtEdKpYmWZuypEyXgR6OnQ" Message-ID: <2be84a80-e227-40cd-b63d-781dab0d9fb1@windriver.com> Date: Tue, 14 Jul 2026 17:33:04 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [yocto] Limiting Yocto Memory Usage To: yocto@lists.yoctoproject.org, luis.merayo@ridgerun.com References: Content-Language: en-CA From: Randy MacLeod In-Reply-To: X-ClientProxiedBy: YT4P288CA0043.CANP288.PROD.OUTLOOK.COM (2603:10b6:b01:d3::29) To CH3PR11MB8496.namprd11.prod.outlook.com (2603:10b6:610:1ba::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR11MB8496:EE_|PH8PR11MB7094:EE_ X-MS-Office365-Filtering-Correlation-Id: 32c247a6-39be-4d9b-1934-08dee1ef7dfe X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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--------------zXbtEdKpYmWZuypEyXgR6OnQ 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 66EIxmLp2631659 Hi Luis, On 2026-07-10 17:26, Luis Merayo via lists.yoctoproject.org wrote: > Hi, > > I would like to know if there is a way to limit Bitbake's Memory usage=20 > to a specific percentage of the available RAM. For example, can the=20 > Yocto build be limited to use a maximum of 70% of RAM? Not without using a container to do the build. > > Could these three variables achieve this? > > BB_PRESSURE_MAX_CPU=20 > ,=20 > BB_PRESSURE_MAX_IO=20 > =C2=A0,=20 > BB_PRESSURE_MAX_MEMORY=20 > > > I see the range for these variables is from 1 to 1000000, so I would=20 > like to understand if there is a way to specify their values as a=20 > function of the available=C2=A0RAM. No, there is only pressure when resources are over-commited so if you=20 have free memory, there's no over-commit. https://docs.kernel.org/accounting/psi.html That's the design intent of the bitbake PRESSURE regulation system. There are plans to work on additional build system regulation. The first idea is to use the jobserver design: https://lore.kernel.org/openembedded-core/?q=3DGNU+AND+jobserver++AND+f%3= Amacleod and that would indirectly limit memory consumption since there would be=20 fewer instances of gcc / rustc / ... running at once. There's also an even less clear idea about being able to restrict the=20 build by specifying memory usage. That shouldn't be too hard to implement in bitbake in the same point=20 where the pressure checks happen. Are you interested in working on that ? There are of course other levers to pull to reduce CPU/memory consumption= : https://docs.yoctoproject.org/dev-manual/limiting-resources.html Have you tried them ? > > Regards, > > Luis > > > > File:RidgeRun.ai banner.png > This email and any attachments are intended for the sole use of the=20 > named recipient(s) and contain(s) confidential information that may be=20 > proprietary, privileged, or copyrighted under applicable law. If you=20 > are not the intended recipient, do not read, copy, or forward this=20 > email message or any attachments, delete this email message and any=20 > attachments immediately. > > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > Links: You receive all messages sent to this group. > View/Reply Online (#66637):https://lists.yoctoproject.org/g/yocto/messa= ge/66637 > Mute This Topic:https://lists.yoctoproject.org/mt/120213825/3616765 > Group Owner:yocto+owner@lists.yoctoproject.org > Unsubscribe:https://lists.yoctoproject.org/g/yocto/unsub [randy.macleod= @windriver.com] > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > --=20 # Randy MacLeod # Wind River Linux --------------zXbtEdKpYmWZuypEyXgR6OnQ Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
Hi Luis,

On 2026-07-10 17:26, Luis Merayo via lists.yoctoproject.org wrote:
Hi,

I would like to know if there is a way to limit Bitbake's Memory usage to a specific percentage of the available RAM. For example, can the Yocto build be limited to use a maximum of 70% of RAM?
Not without using a container to do the build.

Could these three variables achieve this?

 BB_PRESSURE_MAX_CPU, BB_PRESSURE_MAX_IO , BB_PRESSURE_MAX_MEMORY

I see the range for these variables is from 1 to 1000000, so I would like to understand if there is a way to specify their values as a function of the available RAM.
No, there is only pressure when resources are over-commited so if you have free memory, there's no over-commit.
   https://docs.kernel.org/accounting/psi.html

That's the design intent of the bitbake PRESSURE regulation system.

There are plans to work on additional build system regulation.

The first idea is to use the jobserver design:
   https://lore.kernel.org/openembedded-core/?q=GNU+AND+jobserver++AND+f%3Amacleod
and that would indirectly limit memory consumption since there would be fewer instances of gcc / rustc / ... running
at once.

There's also an even less clear idea about being able to restrict the build by specifying memory usage.
That shouldn't be too hard to implement in bitbake in the same point where the pressure checks happen.
Are you interested in working on that ?

There are of course other levers to pull to reduce CPU/memory consumption:
  https://docs.yoctoproject.org/dev-manual/limiting-resources.html

Have you tried them ?

Regards,

Luis



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