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Optimize indentation in the pretty printer. #59507

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merged 1 commit into from
Apr 1, 2019
Merged

Optimize indentation in the pretty printer. #59507

merged 1 commit into from
Apr 1, 2019

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nnethercote
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Currently the pretty-printer calls write! for every space of
indentation. On some workloads the indentation level can exceed 100, and
a faster implementation reduces instruction counts by up to 7% on a few
workloads.

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r? @petrochenkov

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Mar 28, 2019
@nnethercote
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Some local measurements. webrender_api is not part of rustc-perf, but I added it locally because of rust-lang/rustc-perf#312.

crates.io-check
        avg: -4.1%      min: -7.4%      max: -1.8%
webrender_api-check
        avg: -4.2%      min: -6.8%      max: -3.1%
cargo-check
        avg: -1.5%      min: -2.6%      max: -0.6%

The bigger improvements are for incremental compilation.

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@bors try

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bors commented Mar 28, 2019

⌛ Trying commit bca0279 with merge cf0a738...

bors added a commit that referenced this pull request Mar 28, 2019
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Auto merge of #59507 - nnethercote:indent-with-SPACES, r=<try>
cf0a738 
Optimize indentation in the pretty printer.

Currently the pretty-printer calls `write!` for every space of
indentation. On some workloads the indentation level can exceed 100, and
a faster implementation reduces instruction counts by up to 7% on a few
workloads.
@nnethercote nnethercote mentioned this pull request Mar 28, 2019
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bors commented Mar 29, 2019

☀️ Try build successful - checks-travis
Build commit: cf0a738

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@rust-timer build cf0a738

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Success: Queued cf0a738 with parent 237bf32, comparison URL.

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Finished benchmarking try commit cf0a738

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r=me with nits addressed

@petrochenkov petrochenkov 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 29, 2019
eddyb
eddyb reviewed Mar 29, 2019
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src/libsyntax/print/pp.rs Outdated Show resolved Hide resolved
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I addressed the nits. Measurements show that avoiding write! made a tiny improvement, saving another 0.1% on the best cases.

@bors r=petrochenkov

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bors commented Mar 29, 2019

📌 Commit a7292a7216dae4d40856c62bdfac7fd2432bc351 has been approved by petrochenkov

@bors bors 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 29, 2019
ollie27
ollie27 suggested changes Mar 29, 2019
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write isn't guaranteed to write all of the bytes.

@bors r-

src/libsyntax/print/pp.rs Outdated Show resolved Hide resolved
src/libsyntax/print/pp.rs Outdated Show resolved Hide resolved
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Centril commented Mar 29, 2019

^--- @bors r-

@bors bors 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Mar 29, 2019
@nnethercote
Optimize indentation in the pretty printer.
606f315 
Currently the pretty-printer calls `write!` for every space of
indentation. On some workloads the indentation level can exceed 100, and
a faster implementation reduces instruction counts by up to 7% on a few
workloads.
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I changed the write calls to write_all.

@bors r=petrochenkov

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bors commented Mar 31, 2019

📌 Commit 606f315 has been approved by petrochenkov

@bors bors 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 31, 2019
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bors commented Mar 31, 2019

⌛ Testing commit 606f315 with merge eab3eb3...

bors added a commit that referenced this pull request Mar 31, 2019
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Auto merge of #59507 - nnethercote:indent-with-SPACES, r=petrochenkov
eab3eb3 
Optimize indentation in the pretty printer.

Currently the pretty-printer calls `write!` for every space of
indentation. On some workloads the indentation level can exceed 100, and
a faster implementation reduces instruction counts by up to 7% on a few
workloads.
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bors commented Apr 1, 2019

☀️ Test successful - checks-travis, status-appveyor
Approved by: petrochenkov
Pushing eab3eb3 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Apr 1, 2019
@bors bors merged commit 606f315 into rust-lang:master Apr 1, 2019
@nnethercote nnethercote deleted the indent-with-SPACES branch April 2, 2019 06:06
@nnethercote nnethercote mentioned this pull request Apr 2, 2019
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