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Shrink Nonterminal #67340

Merged
merged 2 commits into from
Jan 31, 2020
Merged

Shrink Nonterminal #67340

merged 2 commits into from
Jan 31, 2020

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nnethercote
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These commits shrink Nonterminal from 240 bytes to 40 bytes. When building serde_derive they reduce the number of memcpy calls from 9.6M to 7.4M, and it's a tiny win on a few other benchmarks.

r? @petrochenkov

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 16, 2019
@nnethercote
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Notable local check-clean results:

serde-serde_derive-check
        avg: -0.8%      min: -0.8%      max: -0.8%
coercions-check
        avg: -0.4%?     min: -0.4%?     max: -0.4%?
deep-vector-check
        avg: -0.3%      min: -0.3%      max: -0.3%
tuple-stress-check
        avg: 0.2%       min: 0.2%       max: 0.2%
helloworld-check
        avg: -0.1%      min: -0.1%      max: -0.1%
issue-46449-check
        avg: -0.1%      min: -0.1%      max: -0.1%
unify-linearly-check
        avg: -0.1%      min: -0.1%      max: -0.1%
syn-check
        avg: -0.1%      min: -0.1%      max: -0.1%
unicode_normalization-check
        avg: 0.1%       min: 0.1%       max: 0.1%
await-call-tree-check
        avg: -0.1%      min: -0.1%      max: -0.1%
tokio-webpush-simple-check
        avg: -0.1%      min: -0.1%      max: -0.1%

Note that serde_derive is not part of rustc-perf, but I have included it in my local copy to get the above results.

@nnethercote nnethercote mentioned this pull request Dec 16, 2019
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@Centril
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Centril commented Dec 16, 2019

Would appreciate if we could block merging this PR on first merging #67131 since this one will generate a lot of conflicts with that PR.

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Centril commented Dec 16, 2019

@bors try @rust-timer queue

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Awaiting bors try build completion

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bors commented Dec 16, 2019

⌛ Trying commit ed9ba9b with merge 23f3174...

bors added a commit that referenced this pull request Dec 16, 2019
@bors
Auto merge of #67340 - nnethercote:shrink-Nonterminal, r=<try>
23f3174 
Shrink `Nonterminal`

These commits shrink `Nonterminal` from 240 bytes to 40 bytes. When building `serde_derive` they reduce the number of `memcpy` calls from 9.6M to 7.4M, and it's a tiny win on a few other benchmarks.

r? @petrochenkov
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bors commented Dec 16, 2019

☀️ Try build successful - checks-azure
Build commit: 23f3174 (23f3174f3dafe415f12b9c931d59df4853cadedd)

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Queued 23f3174 with parent a605441, future comparison URL.

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Finished benchmarking try commit 23f3174, comparison URL.

@nnethercote
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Here are the serde_derive results, for comparison:

serde-serde_derive-check
- avg: -1.1%  min: -1.8%  max: -0.7% 
- clean                 11,770,595,200.00  11,668,371,819.00  -0.9% 
- baseline incremental  14,431,966,930.00  14,328,177,470.00  -0.7% 
- clean incremental      5,746,154,634.00   5,642,802,601.00  -1.8%

@petrochenkov
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r=me after rebase

@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 Dec 29, 2019
@joelpalmer
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Ping from Triage: Any updates @nnethercote?

@JohnTitor JohnTitor added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jan 19, 2020
@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-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Jan 27, 2020
@nnethercote
Use P for NtTraitItem, NtImplItem, and NtForeignItem.
0d69fe8 
This commit reduces the size of `Nonterminal` from a whopping 240 bytes
to 72 bytes (on x86-64), which gets it below the `memcpy` threshold.

It also removes some impedance mismatches with `Annotatable`, which
already uses `P` for these variants.
@nnethercote
Use P for NtMeta.
7d2173e 
This commit reduces the size of `Nonterminal` from a 72 bytes to 40 bytes (on
x86-64).
@nnethercote
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Back now from PTO, I have rebased.

@bors try @rust-timer queue

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Awaiting bors try build completion

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bors commented Jan 30, 2020

⌛ Trying commit 7d2173e with merge 1941303dc808ee27858ab3d907f612c9ab9c972d...

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bors commented Jan 30, 2020

☀️ Try build successful - checks-azure
Build commit: 1941303dc808ee27858ab3d907f612c9ab9c972d (1941303dc808ee27858ab3d907f612c9ab9c972d)

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Queued 1941303dc808ee27858ab3d907f612c9ab9c972d with parent 9ed29b6, future comparison URL.

@nnethercote
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rust-timer didn't give us a "finished" message, but the results are in and look as expected -- a small win.

r? @petrochenkov

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@bors r+

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bors commented Jan 31, 2020

📌 Commit 7d2173e 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 Jan 31, 2020
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bors commented Jan 31, 2020

⌛ Testing commit 7d2173e with merge b1cb3c0...

bors added a commit that referenced this pull request Jan 31, 2020
@bors
Auto merge of #67340 - nnethercote:shrink-Nonterminal, r=petrochenkov
b1cb3c0 
Shrink `Nonterminal`

These commits shrink `Nonterminal` from 240 bytes to 40 bytes. When building `serde_derive` they reduce the number of `memcpy` calls from 9.6M to 7.4M, and it's a tiny win on a few other benchmarks.

r? @petrochenkov
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bors commented Jan 31, 2020

☀️ Test successful - checks-azure
Approved by: petrochenkov
Pushing b1cb3c0 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Jan 31, 2020
@bors bors merged commit 7d2173e into rust-lang:master Jan 31, 2020
@rust-highfive
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📣 Toolstate changed by #67340!

Tested on commit b1cb3c0.
Direct link to PR: #67340

🎉 rustc-guide on linux: test-fail → test-pass (cc @JohnTitor @amanjeev @spastorino @mark-i-m, @rust-lang/infra).

rust-highfive added a commit to rust-lang-nursery/rust-toolstate that referenced this pull request Jan 31, 2020
@rust-highfive
📣 Toolstate changed by rust-lang/rust#67340!
46cb4a1 
Tested on commit rust-lang/rust@b1cb3c0.
Direct link to PR: <rust-lang/rust#67340>

🎉 rustc-guide on linux: test-fail → test-pass (cc @JohnTitor @amanjeev @spastorino @mark-i-m, @rust-lang/infra).
@nnethercote nnethercote deleted the shrink-Nonterminal branch February 2, 2020 20:24
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