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Support cargo build --load-average / -l like GNU make #7480

Closed as not planned
Closed as not planned
Support cargo build --load-average / -l like GNU make#7480
Labels
A-build-executionArea: anything dealing with executing the compilerA-jobserverArea: jobserver, concurrency, parallelismC-feature-requestCategory: proposal for a feature. Before PR, ping rust-lang/cargo if this is not `Feature accepted`S-needs-designStatus: Needs someone to work further on the design for the feature or fix. NOT YET accepted.

Description

@devurandom
devurandom
opened on Oct 4, 2019

Describe the problem you are trying to solve

I am trying to limit the load on my system while building Rust software.

Describe the solution you'd like

GNU make supports a make -l4 / make --load-average=4 parameter, that allows me to limit the target system load to 4 (e.g.). It would be nice, if Cargo would support the same.

Activity

  1. devurandom
    added
    C-feature-requestCategory: proposal for a feature. Before PR, ping rust-lang/cargo if this is not `Feature accepted`
    on Oct 4, 2019

  2. guanqun commented on Oct 28, 2019

    @guanqun
    guanqun
    on Oct 28, 2019

    I did some quick googling and found this answer: https://stackoverflow.com/a/13355071 . It seems the author prefers using a -j option, and in cargo, the -j option is implemented, do you think you can use that instead to limit the load?

  3. devurandom commented on Oct 28, 2019

    @devurandom
    devurandom
    on Oct 28, 2019
    Author

    -j does not care about the load on the system. Keep in mind that many processes can create load, not just make or cargo. Spawning many compilation tasks, where each uses -j N (or worse, unbounded -j), can bring a system to halt. -l M prevents that reasonably well.

    I think the author of that answer also makes the mistake of passing an unbounded -j in combination with -l. If one passes a limit as in -j 6 -l 4, then make will spawn up to 6 processes, but only when the load does not exceed 4.

  4. jaccc commented on Apr 11, 2021

    @jaccc
    jaccc
    on Apr 11, 2021

    it would be useful

  5. epage
    added
    S-needs-designStatus: Needs someone to work further on the design for the feature or fix. NOT YET accepted.
    A-jobserverArea: jobserver, concurrency, parallelism
    A-build-executionArea: anything dealing with executing the compiler
    on Nov 2, 2023

  6. weihanglo commented on Nov 2, 2023

    @weihanglo
    weihanglo
    on Nov 2, 2023
    Member

    Not aware of this issue until today! Seems like it is #8556 with a specific solution in mind

  7. epage commented on Nov 3, 2023

    @epage
    epage
    on Nov 3, 2023
    Contributor

    Closing in favor of #12912 so we keep the conversation in one place.

  8. epage
    closed this as not plannedon Nov 3, 2023
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    A-build-executionArea: anything dealing with executing the compilerA-jobserverArea: jobserver, concurrency, parallelismC-feature-requestCategory: proposal for a feature. Before PR, ping rust-lang/cargo if this is not `Feature accepted`S-needs-designStatus: Needs someone to work further on the design for the feature or fix. NOT YET accepted.

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