Optimize Rust Analyzer with BOLT

[Kobzol]

Funnily enough, it is easier to use BOLT for another component than to do PGO (at least I think so..). Let's try.

r? @ghost

try-job: dist-x86_64-linux

[Kobzol]

@bors try @rust-timer queue

[bors]

⌛ Trying commit 925fdb1 with merge 300be8e...

[bors]

☀️ Try build successful - checks-actions
Build commit: 300be8e (300be8ebbb2c84b13cb0e70bdba848a9101038fc)

[Kobzol]

@bors try

[bors]

⌛ Trying commit 925fdb1 with merge 39d181d...

[rust-timer]

Finished benchmarking commit (300be8e): comparison URL.

Overall result: no relevant changes - no action needed

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-perf -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary -2.6%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.6%	[-2.6%, -2.6%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.6%	[-2.6%, -2.6%]	1

Cycles

Results (secondary 3.2%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.2%	[3.2%, 3.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 783.243s -> 783.771s (0.07%)
Artifact size: 366.21 MiB -> 366.18 MiB (-0.01%)

[bors]

☀️ Try build successful - checks-actions
Build commit: 39d181d (39d181d7a76ec618eb9f568c2c8561c90a71ad46)

[Kobzol]

@bors try

[bors]

⌛ Trying commit d33c8f6 with merge 2f10bd1...

[bors]

☀️ Try build successful - checks-actions
Build commit: 2f10bd1 (2f10bd1d92dbc58d106de1be7a3578c763f42227)

[Kobzol]

@bors try

[bors]

⌛ Trying commit 9d5d925 with merge 82c2bcf...

[bors]

☀️ Try build successful - checks-actions
Build commit: 82c2bcf (82c2bcf046174357289b51920a640c3dc171ba03)

[Kobzol]

@bors try

[bors]

⌛ Trying commit b6af0a6 with merge a697a80...

[bors]

☔ The latest upstream changes (presumably #139588) made this pull request unmergeable. Please resolve the merge conflicts.

[bors]

☀️ Try build successful - checks-actions
Build commit: a697a80 (a697a80df2caed580c71e9c6eb2e3fddc5b4d44c)

[Kobzol]

Looks like BOLT provides a 5% performance boost without PGO. Maybe starting with PGO would be better.

[Kobzol]

BOLT doesn't seem to be worth it for RA performance-wise. However, PGO does have a great effect (rust-lang/rust-analyzer#19595, up to 20%), so we should do that instead.