fs: Warn about performance pitfall #4762
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Darksonn
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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dependencies | minor | `1.19.2` -> `1.20.0` | | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dev-dependencies | minor | `1.19.2` -> `1.20.0` | --- ### Release Notes <details> <summary>tokio-rs/tokio</summary> ### [`v1.20.0`](https://github.com/tokio-rs/tokio/releases/tag/tokio-1.20.0) [Compare Source](tokio-rs/tokio@tokio-1.19.2...tokio-1.20.0) ##### 1.20.0 (July 12, 2022) ##### Added - tokio: add track_caller to public APIs ([#​4772], [#​4791], [#​4793], [#​4806], [#​4808]) - sync: Add `has_changed` method to `watch::Ref` ([#​4758]) ##### Changed - time: remove `src/time/driver/wheel/stack.rs` ([#​4766]) - rt: clean up arguments passed to basic scheduler ([#​4767]) - net: be more specific about winapi features ([#​4764]) - tokio: use const initialized thread locals where possible ([#​4677]) - task: various small improvements to LocalKey ([#​4795]) ##### Fixed ##### Documented - fs: warn about performance pitfall ([#​4762]) - chore: fix spelling ([#​4769]) - sync: document spurious failures in oneshot ([#​4777]) - sync: add warning for watch in non-Send futures ([#​4741]) - chore: fix typo ([#​4798]) ##### Unstable - joinset: rename `join_one` to `join_next` ([#​4755]) - rt: unhandled panic config for current thread rt ([#​4770]) [#​4677]: tokio-rs/tokio#4677 [#​4741]: tokio-rs/tokio#4741 [#​4755]: tokio-rs/tokio#4755 [#​4758]: tokio-rs/tokio#4758 [#​4762]: tokio-rs/tokio#4762 [#​4764]: tokio-rs/tokio#4764 [#​4766]: tokio-rs/tokio#4766 [#​4767]: tokio-rs/tokio#4767 [#​4769]: tokio-rs/tokio#4769 [#​4770]: tokio-rs/tokio#4770 [#​4772]: tokio-rs/tokio#4772 [#​4777]: tokio-rs/tokio#4777 [#​4791]: tokio-rs/tokio#4791 [#​4793]: tokio-rs/tokio#4793 [#​4795]: tokio-rs/tokio#4795 [#​4798]: tokio-rs/tokio#4798 [#​4806]: tokio-rs/tokio#4806 [#​4808]: tokio-rs/tokio#4808 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox. --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4xMTEuMSIsInVwZGF0ZWRJblZlciI6IjMyLjExMS4xIn0=--> Co-authored-by: cabr2-bot <[email protected]> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1458 Reviewed-by: crapStone <[email protected]> Co-authored-by: Calciumdibromid Bot <[email protected]> Co-committed-by: Calciumdibromid Bot <[email protected]>
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Motivation
Straightforwardly porting synchronous filesystem code to
tokio::fscan cause unexpected performance issues (and with tracing, memory issues too), if one is not aware of the implications of adapters spawning a new task for every operation.Solution
Document the pitfall and provide a replacement example for the common action of reading a file line by line.