Add ArrayVec and AccumulateVec to reduce heap allocations during interning of slices#37270

Mark-Simulacrum · 2016-10-19T05:30:15Z

Updates mk_tup, mk_type_list, and mk_substs to allow interning directly from iterators. The previous PR, #37220, changed some of the calls to pass a borrowed slice from Vec instead of directly passing the iterator, and these changes further optimize that to avoid the allocation entirely.

This change yields 50% less malloc calls in some cases. It also yields decent, though not amazing, performance improvements:

futures-rs-test  4.091s vs  4.021s --> 1.017x faster (variance: 1.004x, 1.004x)
helloworld       0.219s vs  0.220s --> 0.993x faster (variance: 1.010x, 1.018x)
html5ever-2016-  3.805s vs  3.736s --> 1.018x faster (variance: 1.003x, 1.009x)
hyper.0.5.0      4.609s vs  4.571s --> 1.008x faster (variance: 1.015x, 1.017x)
inflate-0.1.0    3.864s vs  3.883s --> 0.995x faster (variance: 1.232x, 1.005x)
issue-32062-equ  0.309s vs  0.299s --> 1.033x faster (variance: 1.014x, 1.003x)
issue-32278-big  1.614s vs  1.594s --> 1.013x faster (variance: 1.007x, 1.004x)
jld-day15-parse  1.390s vs  1.326s --> 1.049x faster (variance: 1.006x, 1.009x)
piston-image-0. 10.930s vs 10.675s --> 1.024x faster (variance: 1.006x, 1.010x)
reddit-stress    2.302s vs  2.261s --> 1.019x faster (variance: 1.010x, 1.026x)
regex.0.1.30     2.250s vs  2.240s --> 1.005x faster (variance: 1.087x, 1.011x)
rust-encoding-0  1.895s vs  1.887s --> 1.005x faster (variance: 1.005x, 1.018x)
syntex-0.42.2   29.045s vs 28.663s --> 1.013x faster (variance: 1.004x, 1.006x)
syntex-0.42.2-i 13.925s vs 13.868s --> 1.004x faster (variance: 1.022x, 1.007x)

We implement a small-size optimized vector, intended to be used primarily for collection of presumed to be short iterators. This vector cannot be "upsized/reallocated" into a heap-allocated vector, since that would require (slow) branching logic, but during the initial collection from an iterator heap-allocation is possible.

We make the new AccumulateVec and ArrayVec generic over implementors of the Array trait, of which there is currently one, [T; 8]. In the future, this is likely to expand to other values of N.

Huge thanks to @nnethercote for collecting the performance and other statistics mentioned above.

eddyb · 2016-10-19T06:23:58Z

cc @rust-lang/lang We'd like to have impls of SliceInternable for &[T]/&Vec<T> and for iterators.
This is a powerful pattern as it, unlike IntoIterator, forces callers to choose between providing an existent container in memory or an iterator when the former isn't available, without duplicating APIs.
However this results in a conflicting impls error right now, because Iterator is from another crate and not #[fundamental] - do you think we can make it fundamental? There is precedent - Fn traits are fundamental, according to a comment, for regex to be able to not have them conflict with &str.

bors · 2016-10-19T10:00:53Z

☔ The latest upstream changes (presumably #37269) made this pull request unmergeable. Please resolve the merge conflicts.

bluss · 2016-10-19T11:18:21Z

src/librustc_data_structures/smallvec.rs

Isn't this a good place to use from_raw_parts and skip the bounds check for the slice? Or does it not matter?

Oh I see, didn't think of it like that. Yeah it would be slightly less cruft to optimize away.

bluss · 2016-10-19T11:20:18Z

src/librustc_data_structures/smallvec.rs

Since rustc devs are the UB police, is this guaranteed to be convertible to T, even without #[repr(C)]? (I'm reading this PR with interest for the future of the external arrayvec and smallvec crates of course.)

It's technically in newtype form, so we can guarantee it at no cost. However, adding #[repr(C)] would be better here, for now.

Adding #[repr(C)] would require that T is repr(C), I thought? Or is that just a lint, and we can allow it away?

Should work fine, try it out.

bluss · 2016-10-19T11:27:45Z

src/librustc_data_structures/smallvec.rs

If you have DerefMut, this is just drop_in_place(&mut self[..])

Adding DerefMut feels unsafe since we then have potential for safe mutation of the stack allocated buffer, which we probably don't want to allow?

I don't see what's unsound about modifying the buffer, since it's only making a slice of the valid/initialized element range.

It's perfectly safe, it can't do anything harmful, not even semantically.

eddyb · 2016-10-19T15:11:14Z

src/librustc_data_structures/smallvec.rs

These two variables need to be in a SmallVec8 variable for unwinding to drop the right values.

eddyb · 2016-10-19T15:12:07Z

src/librustc_data_structures/smallvec.rs

This should use field assignment, i.e .value = el.

Mark-Simulacrum

Leaving comments to myself, mainly, but a few questions for @eddyb as well.

Mark-Simulacrum · 2016-10-19T15:23:42Z

src/librustc/ty/context.rs

This should probably take I: SliceInternable, but then the current code doesn't support passing it to iter::chain, since SliceInternable is not an Iterator. @eddyb Thoughts on what we should/could do here?

Most users are genuinely slice though. Not high-priority.

Mark-Simulacrum · 2016-10-19T15:25:21Z

src/librustc/ty/subst.rs

We want to avoid Iterator::cloned(), but the types don't match up here to allow that, since we're iterating over &Substs, not Substs. I'm not sure if there is/what the good solution here is; I believe this is semi-common though.

You can't avoid an iterator here. .cloned() is suspicious when used on a slice that can be passed directly - there's no cloning cost, these are just pointer copies.

Can you clarify as to if it's possible to avoid .cloned() here? The target_substs and (I believe) the slice into self are both &Kind instead of Kind. Or is it Ty?

It's not but that's irrelevant here. cloned is not bad, it's just a sign of a slice iterator, which in some cases (not this) can be replaced with the slice itself.

Mark-Simulacrum · 2016-10-19T15:26:06Z

src/librustc_data_structures/smallvec.rs

Adding #[repr(C)] would require that T is repr(C), I thought? Or is that just a lint, and we can allow it away?

Mark-Simulacrum · 2016-10-19T15:27:17Z

src/librustc_data_structures/smallvec.rs

Adding DerefMut feels unsafe since we then have potential for safe mutation of the stack allocated buffer, which we probably don't want to allow?

Mark-Simulacrum · 2016-10-19T15:28:24Z

src/librustc_mir/build/scope.rs

I feel like this might be easier to optimize if we skip the iter::once, since we're not joining it with anything anyway. Leaving this is a note to self, mostly, since I'm not sure we can omit the iterator with the current implementation.

intern_substs with a slice.

Mark-Simulacrum · 2016-10-19T15:29:12Z

src/librustc_mir/hair/cx/mod.rs

Should we be taking a params: SliceInternable<...> instead of &[...] here?

I wish. Most of these take a slice though.

Mark-Simulacrum · 2016-10-19T15:29:58Z

src/librustc_typeck/astconv.rs

Should collect into a MaybeSmallVec8.

Can't this use an itera- ah shucks, the slice impl problem.

Mark-Simulacrum · 2016-10-19T15:30:58Z

src/librustc_typeck/check/closure.rs

Should we be allocating a vec![...] here? I feel like we might be able to change the struct's type to a SmallVec8?

The correct thing to do is to intern a slice, but that's a bit more complicated of a refactoring.

Mark-Simulacrum · 2016-10-19T15:31:16Z

src/librustc_typeck/check/mod.rs

Don't collect into a Vec. (this requires slice impl)

eddyb · 2016-10-19T15:35:21Z

src/librustc_data_structures/smallvec.rs

If you make this loop an Extend impl, you can then have fill_item take T: Extend<Kind> + Deref<Target=[Kind]>.

eddyb · 2016-10-19T16:49:15Z

EDIT: Moved this to a PR comment to be able to link it.

Oh, turns out #[repr(C)] is wrong, for subtle reasons! The size of a C struct/union is an aligned size of its contents, but its alignment can be higher than the alignments of any fields.

That is, there is a "minimum struct/union" alignment (not sure where in the C standard, but LLVM supports it and so do we! I just checked and no built-in target specs have minimum ABI alignment for struct/union that's larger than one byte, just "preferred alignment").
And if this alignment larger than the size of the contents, the size of the struct/union will be the alignment.

The correct thing to do is #[repr(transparent)] from rust-lang/rfcs#1758.

Thanks to @ubsan and @retep998 on IRC for figuring this out!

eddyb · 2016-10-19T18:10:35Z

src/librustc/ty/subst.rs

Put the bounds in the where clause.

eddyb · 2016-10-19T18:11:25Z

src/librustc_driver/test.rs

This can pass a slice to intern_substs.

eddyb · 2016-10-19T18:11:33Z

src/librustc_driver/test.rs

Same as above.

eddyb · 2016-10-19T18:11:39Z

src/librustc_driver/test.rs

Same as above.

bors · 2016-10-19T20:08:02Z

☔ The latest upstream changes (presumably #37220) made this pull request unmergeable. Please resolve the merge conflicts.

eddyb · 2016-10-19T21:02:24Z

src/librustc/ty/subst.rs

All of these arguments need to be reindented.

Mark-Simulacrum · 2016-10-19T21:39:14Z

Performance, compared with current master, stage2 release builds (configured with no arguments):

futures-rs-test  4.726s vs  4.729s --> 0.999x faster (variance: 1.027x, 1.018x)
helloworld       0.317s vs  0.305s --> 1.039x faster (variance: 1.082x, 1.167x)
html5ever-2016-  6.668s vs  6.647s --> 1.003x faster (variance: 1.013x, 1.014x)
hyper.0.5.0      5.478s vs  5.368s --> 1.020x faster (variance: 1.045x, 1.023x)
inflate-0.1.0    4.397s vs  4.360s --> 1.008x faster (variance: 1.007x, 1.014x)
issue-32062-equ  0.408s vs  0.420s --> 0.969x faster (variance: 1.229x, 1.110x)
issue-32278-big  2.117s vs  2.028s --> 1.044x faster (variance: 1.021x, 1.069x)
jld-day15-parse  1.660s vs  1.684s --> 0.986x faster (variance: 1.050x, 1.026x)
piston-image-0. 12.664s vs 12.481s --> 1.015x faster (variance: 1.003x, 1.009x)
regex.0.1.30     2.780s vs  2.768s --> 1.005x faster (variance: 1.139x, 1.033x)
rust-encoding-0  2.342s vs  2.373s --> 0.987x faster (variance: 1.087x, 1.093x)
syntex-0.42.2   31.017s vs 30.904s --> 1.004x faster (variance: 1.035x, 1.001x)
syntex-0.42.2-i 16.111s vs 16.202s --> 0.994x faster (variance: 1.008x, 1.005x)

eddyb · 2016-10-19T21:44:42Z

@Mark-Simulacrum I'm surprised a bit, I would've expected more wins given how high allocation was on the profile. Maybe the SmallVec8 case isn't hit that often? @nnethercote might want to take a look.

nikomatsakis · 2016-10-19T21:57:30Z

OK, so, @rust-lang/lang: @eddyb and I had a short chat about fundamental traits on IRC. I am not comfortable with declaring Iterator to be fundamental because I hold out hope we can remove the notion of fundamental traits and replace it with negative impls (though I'm not 100% sure this is a good idea). But I'd hate to do any hasty steps that make it harder to change fundamental in the future.

However, I would be comfortable with doing a targeted extension to fundamental. Basically a mildly hacky negative impl. For example, we discussed allowing #[fundamental(slice)] which would say "this trait is fundamental for slice types". This could be applied to Iterator.

We would thus be committed to adding negative impls of Iterator to [T] in the future if we changed from fundamental to explicit negative impls. But we basically are anyway, given how IntoIterator is setup and so forth.

How do people feel about that? (I'm happy to guide @Mark-Simulacrum through the steps to do that change.)

withoutboats · 2016-10-19T22:05:25Z

@nikomatsakis first paragraph is how I felt when I saw @eddyb's question also. One of the biggest problems with #[fundamental] is that it is a potentially breaking change to implement a fundamental trait for an existing type, and this is totally undocumented.

#[fundamental(slice)] avoids that problem, at least. It is certainly a hack though, and I'm a little uncomfortable about the possibility that negative impls don't work out and now we have this hack in the language forever. People are also pretty likely to rely on it without realizing it - an impl for [T] and an impl for I: Iterator<Item = T> are probably one of the most common pairs of conflicting impls that people are running into right now.

eddyb · 2016-10-19T22:09:06Z

Do note that we don't care about [T] (only sized types are involved), but &[T] which is "slice reference".
That's why I suggested #[fundamental(primitive)] on IRC.

nikomatsakis · 2016-10-19T22:15:12Z

@withoutboats

#[fundamental(slice)] avoids that problem, at least. It is certainly a hack though, and I'm a little uncomfortable about the possibility that negative impls don't work out and now we have this hack in the language forever.

I guess part of this is that, if I were happy with #[fundamental], I'd probably be ok w/ Iterator being fundamental. IOW, if negative impls didn't work out, we could remove #[fundamental(slice)] and just mark Iterator as #[fundamental] -- after all we need some answer to the existing closure traits, which are fundamental. Put another way the whole goal with fundamental was to do something we wouldn't probably want to stabilize, but which let us do the things we knew we would need at minimum. So whatever solution we adopt should be as powerful.

But yeah this does mean we are committing to either Iterator being fundamental or being able to declare a trait not implemented for slice types (in some way).

@eddyb tbh I meant &[T] when I wrote "slice", though I guess that's sloppy terminology on my part.

arielb1 · 2016-10-22T08:10:43Z

@eddyb

IIRC, LLVM can optimize even the malloc case better if you have a fixed capacity (i.e. use RawVec instead of Vec) - re the lack of inductive resizing elimination. Just call the resulting thing AccumulateVec and be done with it.

eddyb · 2016-10-24T04:02:38Z

src/librustc/ty/context.rs

This can be just Slice::empty() like the other one.

nnethercote · 2016-10-26T00:17:49Z

src/librustc_data_structures/accumulatevec.rs

I'd like a slightly more expansive comment that mentions what the threshold is (8) and what happens when it's exceeded.

nnethercote · 2016-10-26T00:18:16Z

src/librustc_data_structures/arrayvec.rs

Likewise, please explain what happens if 8 is exceeded.

AccumulateVec is generic over the Array trait, which is currently only implemented for [T; 8].

…ist, tup} calls.

eddyb · 2016-10-26T02:09:03Z

@bors r+

bors · 2016-10-26T02:09:04Z

📌 Commit 989eba7 has been approved by eddyb

bors · 2016-10-26T10:47:56Z

⌛ Testing commit 989eba7 with merge a6b3b01...

@nnethercote

…ddyb Add ArrayVec and AccumulateVec to reduce heap allocations during interning of slices Updates `mk_tup`, `mk_type_list`, and `mk_substs` to allow interning directly from iterators. The previous PR, #37220, changed some of the calls to pass a borrowed slice from `Vec` instead of directly passing the iterator, and these changes further optimize that to avoid the allocation entirely. This change yields 50% less malloc calls in [some cases](https://pastebin.mozilla.org/8921686). It also yields decent, though not amazing, performance improvements: ``` futures-rs-test 4.091s vs 4.021s --> 1.017x faster (variance: 1.004x, 1.004x) helloworld 0.219s vs 0.220s --> 0.993x faster (variance: 1.010x, 1.018x) html5ever-2016- 3.805s vs 3.736s --> 1.018x faster (variance: 1.003x, 1.009x) hyper.0.5.0 4.609s vs 4.571s --> 1.008x faster (variance: 1.015x, 1.017x) inflate-0.1.0 3.864s vs 3.883s --> 0.995x faster (variance: 1.232x, 1.005x) issue-32062-equ 0.309s vs 0.299s --> 1.033x faster (variance: 1.014x, 1.003x) issue-32278-big 1.614s vs 1.594s --> 1.013x faster (variance: 1.007x, 1.004x) jld-day15-parse 1.390s vs 1.326s --> 1.049x faster (variance: 1.006x, 1.009x) piston-image-0. 10.930s vs 10.675s --> 1.024x faster (variance: 1.006x, 1.010x) reddit-stress 2.302s vs 2.261s --> 1.019x faster (variance: 1.010x, 1.026x) regex.0.1.30 2.250s vs 2.240s --> 1.005x faster (variance: 1.087x, 1.011x) rust-encoding-0 1.895s vs 1.887s --> 1.005x faster (variance: 1.005x, 1.018x) syntex-0.42.2 29.045s vs 28.663s --> 1.013x faster (variance: 1.004x, 1.006x) syntex-0.42.2-i 13.925s vs 13.868s --> 1.004x faster (variance: 1.022x, 1.007x) ``` We implement a small-size optimized vector, intended to be used primarily for collection of presumed to be short iterators. This vector cannot be "upsized/reallocated" into a heap-allocated vector, since that would require (slow) branching logic, but during the initial collection from an iterator heap-allocation is possible. We make the new `AccumulateVec` and `ArrayVec` generic over implementors of the `Array` trait, of which there is currently one, `[T; 8]`. In the future, this is likely to expand to other values of N. Huge thanks to @nnethercote for collecting the performance and other statistics mentioned above.

bors · 2016-10-26T14:00:20Z

nnethercote · 2016-10-27T02:40:47Z

I did some malloc profiling on Oct 24 (before this landed) and again on Oct 27 (after this landed). I expect the vast majority of changes are due to this PR. Note that these are total/cumulative numbers, i.e. not the number of live blocks/bytes at any point. (The latter numbers barely changed because the allocations avoided by this PR are all short-lived.)

futures-rs-test-all
- tot_alloc:    1,707,560,318 bytes in 6,425,790 blocks
- tot_alloc:    1,684,053,208 bytes in 4,534,644 blocks

helloworld
- tot_alloc:    16,319,139 bytes in 55,957 blocks
- tot_alloc:    16,293,064 bytes in 54,758 blocks

html5ever-2016-08-25
- tot_alloc:    2,694,623,813 bytes in 13,261,685 blocks
- tot_alloc:    2,669,785,090 bytes in 11,574,173 blocks

hyper.0.5.0
- tot_alloc:    2,041,311,149 bytes in 7,190,317 blocks
- tot_alloc:    2,025,502,800 bytes in 6,044,778 blocks

inflate-0.1.0
- tot_alloc:    1,354,371,607 bytes in 3,480,682 blocks
- tot_alloc:    1,347,002,012 bytes in 2,989,486 blocks

issue-32062-equality-relations-complexity
- tot_alloc:    53,487,018 bytes in 485,981 blocks
- tot_alloc:    49,690,973 bytes in 159,117 blocks

issue-32278-big-array-of-strings
- tot_alloc:    646,450,757 bytes in 3,599,115 blocks
- tot_alloc:    623,056,568 bytes in 2,598,961 blocks

jld-day15-parser
- tot_alloc:    545,848,751 bytes in 3,111,576 blocks
- tot_alloc:    525,497,296 bytes in 1,389,803 blocks

piston-image-0.10.3
- tot_alloc:    5,015,922,795 bytes in 19,904,822 blocks
- tot_alloc:    4,921,821,045 bytes in 13,080,308 blocks

reddit-stress
- tot_alloc:    842,543,754 bytes in 4,627,120 blocks
- tot_alloc:    827,087,063 bytes in 3,681,204 blocks

regex.0.1.30
- tot_alloc:    1,242,156,462 bytes in 4,072,953 blocks
- tot_alloc:    1,233,722,963 bytes in 3,456,286 blocks

rust-encoding-0.3.0
- tot_alloc:    846,368,853 bytes in 2,923,601 blocks
- tot_alloc:    842,673,347 bytes in 2,663,391 blocks

syntex-0.42.2
- tot_alloc:    12,563,080,222 bytes in 42,469,971 blocks
- tot_alloc:    12,462,476,374 bytes in 34,220,542 blocks

syntex-0.42.2-incr-clean
- tot_alloc:    5,890,957,601 bytes in 25,516,470 blocks
- tot_alloc:    5,795,781,970 bytes in 18,186,472 blocks

rust-highfive assigned eddyb Oct 19, 2016

Mark-Simulacrum force-pushed the smallvec-optimized-arenas branch from f963bbd to beee655 Compare October 19, 2016 05:31

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This should use field assignment, i.e .value = el.

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Specify #[repr(transparent)] rust-lang/rfcs#1758

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Put the bounds in the where clause.

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This can pass a slice to intern_substs.

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Same as above.

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Same as above.

Mark-Simulacrum force-pushed the smallvec-optimized-arenas branch from f21961f to a36e00c Compare October 19, 2016 18:39

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All of these arguments need to be reindented.

Mark-Simulacrum force-pushed the smallvec-optimized-arenas branch from d39d8f4 to 25d3b4a Compare October 19, 2016 21:05

Mark-Simulacrum force-pushed the smallvec-optimized-arenas branch from 25d3b4a to 7517e34 Compare October 19, 2016 21:41

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Make SmallVector more general-purpose #37371

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This can be just Slice::empty() like the other one.

Mark-Simulacrum force-pushed the smallvec-optimized-arenas branch 3 times, most recently from b49bfe9 to d56f099 Compare October 25, 2016 00:33

Mark-Simulacrum changed the title ~~Utilize TypedArena::alloc_slice and new MaybeSmallVec8 in mk_* interners~~ Add ArrayVec and AccumulateVec to reduce heap allocations during interning of slices Oct 25, 2016

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eddyb mentioned this pull request Oct 25, 2016

Disjointness based on associated types. rust-lang/rfcs#1672

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Mark-Simulacrum added 3 commits October 25, 2016 20:06

Add AccumulateVec, a potentially stack-allocated vector.

a4f7ba3

AccumulateVec is generic over the Array trait, which is currently only implemented for [T; 8].

Utilize AccumulateVec to avoid heap allocations in mk_{substs, type_l…

982a485

…ist, tup} calls.

Add size hint to Result's FromIterator implementation.

989eba7

Mark-Simulacrum force-pushed the smallvec-optimized-arenas branch from 2059fdc to 989eba7 Compare October 26, 2016 02:06

eddyb removed I-nominated T-lang Relevant to the language team labels Oct 26, 2016

bors merged commit 989eba7 into rust-lang:master Oct 26, 2016

This was referenced Oct 26, 2016

[3/n] rustc: unify and simplify managing associated items. #37402

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[5/n] rustc: record the target type of every adjustment. #37408

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Replace FNV with a faster hash function. #37229

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Mark-Simulacrum deleted the smallvec-optimized-arenas branch October 26, 2016 17:55

brson added the relnotes Marks issues that should be documented in the release notes of the next release. label Nov 1, 2016

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Mark-Simulacrum Oct 19, 2016 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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eddyb commented Oct 19, 2016 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Mark-Simulacrum commented Oct 19, 2016 •

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eddyb commented Oct 19, 2016 •

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eddyb Oct 19, 2016 •

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Mark-Simulacrum Oct 19, 2016 •

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eddyb commented Oct 19, 2016 •

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nikomatsakis commented Oct 19, 2016 •

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arielb1 commented Oct 22, 2016 •

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