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Avoid temporary allocations in render_assoc_item - #82855

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Mar 22, 2021
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Avoid temporary allocations in render_assoc_item#82855
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@jyn514

@jyn514jyn514 commented Mar 7, 2021

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render_assoc_item came up as very hot in a profile of rustdoc on
bevy. This avoids some temporary allocations just to calculate the
length of the header.

This should be a strict improvement, since all string formatting was
done twice before.

cc #82845

@jyn514jyn514 added T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. I-compiletime Issue: Problems and improvements with respect to compile times. labels Mar 7, 2021
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rust-highfive commented Mar 7, 2021

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r? @GuillaumeGomez

(rust-highfive has picked a reviewer for you, use r? to override)

@rust-highfiverust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Mar 7, 2021
@jyn514

jyn514 commented Mar 7, 2021

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@bors try @rust-timer queue

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rust-timer commented Mar 7, 2021

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Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

@rustbotrustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Mar 7, 2021
@jyn514jyn514 changed the title Avoid temporary allocations in render_assoc_item[WIP] Avoid temporary allocations in render_assoc_itemMar 7, 2021
@jyn514jyn514 added S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 7, 2021
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bors commented Mar 7, 2021

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⌛ Trying commit 7b886069c3b698f0ea8e4ced5589b1945fcaf71f with merge 30f3371c2e5ed13ec440a7e3fafea51639bf21f7...

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bors commented Mar 7, 2021

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☀️ Try build successful - checks-actions
Build commit: 30f3371c2e5ed13ec440a7e3fafea51639bf21f7 (30f3371c2e5ed13ec440a7e3fafea51639bf21f7)

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rust-timer commented Mar 7, 2021

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Queued 30f3371c2e5ed13ec440a7e3fafea51639bf21f7 with parent dfe519b, future comparison URL.

@rust-timer

rust-timer commented Mar 7, 2021

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Finished benchmarking try commit (30f3371c2e5ed13ec440a7e3fafea51639bf21f7): comparison url.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying rollup- to bors.

Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

@rustbotrustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Mar 7, 2021
@GuillaumeGomez

GuillaumeGomez commented Mar 7, 2021

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There is at most -0.1% instructions. In any case, good improvement, thanks!

@bors: r+

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bors commented Mar 7, 2021

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📋 Looks like this PR is still in progress, ignoring approval.

Hint: Remove [WIP] from this PR's title when it is ready for review.

@GuillaumeGomez

GuillaumeGomez commented Mar 7, 2021

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And I just saw that the CI wasn't happy and that the PR was still WIP...

@bors: r-

@borsbors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 7, 2021
@jyn514
Avoid temporary allocations in render_assoc_item
1e6d849
`render_assoc_item` came up as very hot in a profile of rustdoc on
`bevy`. This avoids some temporary allocations just to calculate the
length of the header.
This should be a strict improvement, since all string formatting was
done twice before.
@jyn514jyn514 changed the title [WIP] Avoid temporary allocations in render_assoc_itemAvoid temporary allocations in render_assoc_itemMar 7, 2021
@jyn514jyn514 removed the S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. label Mar 7, 2021
@jyn514jyn514 mentioned this pull request Mar 7, 2021
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@jyn514

jyn514 commented Mar 22, 2021

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@bors r=GuillaumeGomez

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bors commented Mar 22, 2021

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📌 Commit 1e6d849 has been approved by GuillaumeGomez

@borsbors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 22, 2021
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bors commented Mar 22, 2021

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⌛ Testing commit 1e6d849 with merge 2b8fbe6...

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bors commented Mar 22, 2021

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☀️ Test successful - checks-actions
Approved by: GuillaumeGomez
Pushing 2b8fbe6 to master...

@borsbors added the merged-by-bors This PR was explicitly merged by bors. label Mar 22, 2021
@bors
bors merged commit 2b8fbe6 into rust-lang:masterMar 22, 2021
@rustbotrustbot added this to the 1.53.0 milestone Mar 22, 2021
This was referenced Mar 22, 2021
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jyn514 deleted the no-temporaries branch March 22, 2021 13:17
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@GuillaumeGomezGuillaumeGomezGuillaumeGomez approved these changes

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I-compiletimeIssue: Problems and improvements with respect to compile times.merged-by-borsThis PR was explicitly merged by bors.S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.

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