Re: [yocto] Limiting Yocto Memory Usage

[Randy MacLeod <randy.macleod@windriver.com>]

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On 2026-07-16 04:22, Ulrich Ölmann via lists.yoctoproject.org wrote:
> Hey Luis,
>
> On Fri, Jul 10 2026 at 15:26 -0600, "Luis Merayo via lists.yoctoproject.org"<luis.merayo=ridgerun.com@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?
> if you are doing your Bitbake work on a machine running a systemd based
> Linux distribution you could simply do something like
>
>    $ systemd-run \
>         --user \
>         --scope \
>         --property=CPUWeight=<YOUR_CPUWEIGHT> \
>         --property=IOWeight=<YOUR_IOWEIGHT> \
>         --property=MemoryHigh=<YOUR_MEMORYHIGH> \
>         --property=OOMPolicy=kill \
>         --unit="bitbake-run" \
>         bitbake [...]
>
> to somewhat limit the resources, see systemd.resource-control(5) and
> systemd.scope(5) for details regarding the used parameters.
>
> Best regards,
> Ulrich


Hi Ulrich,

Using systemd-run is something that I've been meaning to try so it's 
good to hear that you're doing it.

Do you have any experiences to share about this approach ?
Do you do world builds?
Do you run more than one systemd-run build on a given machine?


Of course it doesn't prevent bitbake from pushing the cgroup contained 
system
harder that it can handle and bitbake doesn't have any feedback so 
that's something
to consider when doing the jobserver or free memory build regulation work.

../Randy


>
>
>> 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.
>>
>> Regards,
>>
>> Luis
>>
>>
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-- 
# Randy MacLeod
# Wind River Linux

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