[crater] Try enabling `-Zgcc-ld=lld` #96025

lqd · 2022-04-13T20:49:07Z

To make progress towards using lld, this PR will test a build-and-test crater run enabling -Zgcc-ld, to see if it would cause issues on x86_64-unknown-linux-gnu.

rust-highfive · 2022-04-13T20:49:10Z

r? @fee1-dead

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lqd · 2022-04-13T20:49:28Z

r? @ghost

@bors try

bors · 2022-04-13T20:49:35Z

⌛ Trying commit 05a2b94 with merge 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a...

rust-log-analyzer · 2022-04-13T21:02:07Z

The job x86_64-gnu-llvm-12 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Successfully built 4a28cf23dce6
Successfully tagged rust-ci:latest
Built container sha256:4a28cf23dce681dbde4f9adda00df7b44cb98b06495c74e851d3c9c67f750ef1
Uploading finished image to https://ci-caches.rust-lang.org/docker/7a933025cb171c4b5f5b6011a3583795b8dcc545c75914dd6be8b89a1706a0990abf8b940dcd0d758184ddd671b7cd225927f49feaa72b37c79d66fed681b775
upload failed: - to s3://rust-lang-ci-sccache2/docker/7a933025cb171c4b5f5b6011a3583795b8dcc545c75914dd6be8b89a1706a0990abf8b940dcd0d758184ddd671b7cd225927f49feaa72b37c79d66fed681b775 Unable to locate credentials
[CI_JOB_NAME=x86_64-gnu-llvm-12]
---
   Compiling std_detect v0.1.5 (/checkout/library/stdarch/crates/std_detect)
   Compiling miniz_oxide v0.4.0
   Compiling hashbrown v0.12.0
   Compiling addr2line v0.16.0
error: rust-lld (as ld) not found
error: could not compile `std` due to previous error
Build completed unsuccessfully in 0:04:52

bors · 2022-04-13T22:12:00Z

☀️ Try build successful - checks-actions
Build commit: 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a (1b74e096b9bfb06f84a3007193dcd2f059cbdf6a)

lqd · 2022-04-14T17:18:22Z

Tested locally with a helloworld, cargo clean && cargo +1b74e096b9bfb06f84a3007193dcd2f059cbdf6a build -q && readelf -p .comment target/debug/helloworld seemed to work as expected:

String dump of section '.comment':
  [     0]  Linker: LLD 14.0.0
  [    13]  GCC: (Debian 10.2.1-6) 10.2.1 20210110

I'll run it locally again, over our extended benchmark suite (for the few crates that link and execute code).

In the meantime, we also can make it go through the perf collector to see if something goes horribly wrong with the benchmarks that do involve linking.

(It's somewhat expected that bootstrapping with this PR would require rust-lld to be built: it is my understanding that is not done by default on the PR CI builder, or on the perf collector when gathering bootstrap times)

@rust-timer build 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a

rust-timer · 2022-04-14T17:18:24Z

Queued 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a with parent 0d13f6a, future comparison URL.

rust-timer · 2022-04-14T19:16:14Z

Finished benchmarking commit (1b74e096b9bfb06f84a3007193dcd2f059cbdf6a): comparison url.

Summary:

Primary benchmarks: 🎉 relevant improvements found
Secondary benchmarks: 🎉 relevant improvements found

	Regressions 😿 (primary)	Regressions 😿 (secondary)	Improvements 🎉 (primary)	Improvements 🎉 (secondary)	All 😿 🎉 (primary)
count¹	0	0	16	77	16
mean²	N/A	N/A	-47.3%	-24.6%	-47.3%
max	N/A	N/A	-68.2%	-67.1%	-68.2%

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.
Warning ⚠: The following benchmark(s) failed to build:

rustc

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

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

number of relevant changes ↩
the arithmetic mean of the percent change ↩

lqd · 2022-04-22T10:06:13Z

According to rust-lang/compiler-team#510 (comment) there should be at least a few projects with incorrect build.rs even on x64 linux.

@craterbot run mode=build-and-test

The crater queue is empty enough that this won't delay anyone now. It can be de-prioritized if anyone has a more pressing run to do, like the ones for the betas.

craterbot · 2022-04-22T10:06:19Z

👌 Experiment pr-96025 created and queued.
🤖 Automatically detected try build 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-04-23T18:52:17Z

🚧 Experiment pr-96025 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-04-27T22:44:42Z

🎉 Experiment pr-96025 is completed!
📊 113 regressed and 1001 fixed (228240 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

lqd · 2022-05-12T07:36:13Z

The crater queue is empty, so let's quickly check if some of the flakiness in the unrelated regressions reproduces.

@craterbot run mode=build-and-test crates=https://crater-reports.s3.amazonaws.com/pr-96025/retry-regressed-list.txt

craterbot · 2022-05-12T07:36:15Z

👌 Experiment pr-96025-1 created and queued.
🤖 Automatically detected try build 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-05-12T07:36:17Z

🚧 Experiment pr-96025-1 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-05-12T07:53:33Z

🎉 Experiment pr-96025-1 is completed!
📊 47 regressed and 10 fixed (113 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

lqd · 2022-05-12T07:57:36Z

And since the queue is still empty, let's now check for flakiness in the fixed cases.

@craterbot run mode=build-and-test crates=https://gist.githubusercontent.com/lqd/03ab4552c58faa97ff33a9b3f2f1dc68/raw/5427f95aa75dfb1e01202d9864641b96cf5ac015/pr-96025-retry-fixed-list.txt

craterbot · 2022-05-12T07:57:39Z

👌 Experiment pr-96025-2 created and queued.
🤖 Automatically detected try build 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-05-12T07:57:42Z

🚧 Experiment pr-96025-2 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2022-05-12T10:54:59Z

🎉 Experiment pr-96025-2 is completed!
📊 6 regressed and 95 fixed (1000 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

Mark-Simulacrum · 2022-07-24T21:54:06Z

I'm going to close this PR but we can always reopen and re-run crater when/if needed, seems like we finished the initial collection though.

lqd added 2 commits April 13, 2022 22:30

enable -Zgcc-ld=lld by default for a crater run

130f033

do nothing when -Zgcc-ld is not applicable

05a2b94

rust-highfive assigned fee1-dead Apr 13, 2022

rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Apr 13, 2022

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Apr 13, 2022

lqd unassigned fee1-dead Apr 13, 2022

lqd mentioned this pull request Apr 14, 2022

Stabilize -Zgcc-ld=lld as -Clink-self-contained=linker -Clinker-flavor=gcc-lld rust-lang/compiler-team#510

Closed

3 tasks

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 22, 2022

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Apr 27, 2022

craterbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 12, 2022

craterbot added the S-waiting-on-crater Status: Waiting on a crater run to be completed. label May 12, 2022

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels May 12, 2022

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 12, 2022

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels May 12, 2022

Mark-Simulacrum closed this Jul 24, 2022

Kobzol mentioned this pull request Aug 5, 2023

Tracking issue for speeding up rustc via its build configuration #103595

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[crater] Try enabling `-Zgcc-ld=lld` #96025

[crater] Try enabling `-Zgcc-ld=lld` #96025

lqd commented Apr 13, 2022

rust-highfive commented Apr 13, 2022

lqd commented Apr 13, 2022

bors commented Apr 13, 2022

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bors commented Apr 13, 2022

lqd commented Apr 14, 2022 •

edited

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Mark-Simulacrum commented Jul 24, 2022

[crater] Try enabling -Zgcc-ld=lld #96025

[crater] Try enabling -Zgcc-ld=lld #96025

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lqd commented Apr 13, 2022

rust-highfive commented Apr 13, 2022

lqd commented Apr 13, 2022

bors commented Apr 13, 2022

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lqd commented Apr 14, 2022 • edited Loading

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Mark-Simulacrum commented Jul 24, 2022

[crater] Try enabling `-Zgcc-ld=lld` #96025

[crater] Try enabling `-Zgcc-ld=lld` #96025

lqd commented Apr 14, 2022 •

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