[renovate]

This PR contains the following updates:

Package	Type	Update	Change
divan (source)	workspace.dependencies	major	5.0.0 → 6.0.0

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Release Notes

CodSpeedHQ/codspeed-rust (divan)

v6.0.0

Compare Source

CodSpeed for Rust 6.0.0 removes a source of measurement noise from your CPU Simulation benchmarks, so you can spend less time investigating unexpected changes in unrelated results.

Highlights

Your Divan and Criterion benchmarks now run in separate processes. Changes to one benchmark no longer carry allocator state into the benchmarks that follow it, improving consistency as your benchmark suite evolves.

Early results showed lower run-to-run variance, with roughly 70% fewer benchmarks varying by more than 1%.
No benchmark code changes required. Your WallTime results are unaffected.

Breaking Changes

• Some benchmark values may shift when you upgrade
• Each benchmark adds small process startup overhead to the run

Set CODSPEED_PROCESS_ISOLATION=false to revert to the previous behavior.

What's Changed

• fix(criterion): avoid duplicate setup in simulation iter_batched by @​not-matthias in #​198
• feat(divan): run each benchmark in its own process by @​not-matthias in #​194
• feat(codspeed): declare a Symposium plugin by @​adriencaccia in #​200

Full Changelog: CodSpeedHQ/codspeed-rust@v5.0.3...v6.0.0

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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This PR was generated by Mend Renovate. View the repository job log.

[xtqqczze]

Duplicate of #15602.

[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 6.x releases. But if you manually upgrade to 6.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.

[codspeed]

Merging this PR will degrade performance by 62.71%

2 warnings, 1 note

⚠️ 120 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

Learn more about Macro Runners

Open the report in CodSpeed to investigate

ℹ️ 1 benchmark has no flamegraph

The flamegraph wasn't generated: most of the time was spent in runtime internals, which would leave nothing useful to analyze.

See affected benchmarks

⚡ 9 improved benchmarks
❌ 156 regressed benchmarks
✅ 236 untouched benchmarks
⏩ 70 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	CPU Simulation	single_date_now	181.8 µs	3,212.5 µs	-94.34%
❌	Memory	factor_multiple_u64s[2]	5.6 KB	91.5 KB	-93.85%
❌	Memory	factor_64bit_semiprime	5.7 KB	91.6 KB	-93.81%
❌	Memory	factor_large_u64_prime	5.7 KB	91.6 KB	-93.8%
❌	Memory	single_date_now	15.6 KB	230.1 KB	-93.2%
❌	Memory	complex_relative_date	16.8 KB	231.2 KB	-92.72%
❌	Memory	file_iso_dates	19.6 KB	231.1 KB	-91.51%
❌	Memory	file_custom_format	20.1 KB	231.6 KB	-91.3%
❌	Memory	b64_encode_synthetic	8.5 KB	94.4 KB	-91.03%
❌	Memory	hostname_ip_lookup[100000]	9.1 KB	96.9 KB	-90.57%
❌	Memory	seq_integers	9.5 KB	95.4 KB	-90.02%
❌	Memory	seq_with_step	9.6 KB	95.5 KB	-89.98%
❌	Memory	seq_formatted	10 KB	95.9 KB	-89.53%
❌	CPU Simulation	complex_relative_date	386.2 µs	3,312.7 µs	-88.34%
❌	Memory	factor_three_39_bit_primes	13.6 KB	99.5 KB	-86.34%
❌	Memory	factor_a_prime_to_the_seventh	14.9 KB	101.2 KB	-85.24%
❌	Memory	wc_default_large_line_count[100000]	16.6 KB	102.5 KB	-83.83%
❌	Memory	wc_bytes_lines_synthetic[2000]	16.6 KB	102.5 KB	-83.83%
❌	Memory	wc_lines_large_line_count[500000]	16.6 KB	102.5 KB	-83.83%
❌	Memory	wc_words_synthetic[2000]	16.6 KB	102.5 KB	-83.83%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing renovate/divan-6.x (8cab90e) with main (4939cd4)²}

Footnotes

1. 70 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (2fb0d76) during the generation of this report, so 4939cd4 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩