[not-matthias]

Move the walltime benchmarks to codspeed-macro-x64-ryzen-9950x-ubuntu-24-04:

• benchmarks: the walltime matrix entry
• cargo-codspeed is now installed by downloading its release binary, replacing taiki-e/install-action, whose script needs /dev/fd.
• memtrack-benchmarks now runs on ubuntu-24.04, because it loads eBPF programs from memtrack built at this revision.

Benchmark history starts a new baseline on the new runners.

Refs COD-4140

[greptile-apps]

Confidence Score: 5/5

[Low impact] The PR appears safe to merge; no actionable issues were found in the runner-label changes.

Summary

Moves both walltime benchmark jobs to codspeed-macro-x64-ryzen-9950x-ubuntu-24-04.

• Walltime benchmarks now run on the x64 Ryzen 9950X runner.

_{Reviews (1) · Last reviewed commit: "ci: move walltime benchmarks to the x64 ..." · Reviewed by Greptile}

[codspeed]

Merging this PR will improve performance by ×2.9

4 warnings

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

Learn more about Macro Runners

See affected benchmarks

⚠️ 8 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

⚠️ 18 benchmarks with a significant change ran on different hardware

Their base and head results were measured on machines with a different CPU, core count or memory, so the changes might not come from the code. Run base and head on the same runner type.

Learn more about Macro Runners

See affected benchmarks

⚠️ 18 benchmarks with a significant change ran in a different software environment

Their base and head results were measured with a different OS or toolchain, such as compiler, runtime or library versions, so the changes might come from this difference rather than from the code. Open an affected benchmark to see what changed.

See affected benchmarks

⚡ 18 improved benchmarks
✅ 23 untouched benchmarks
⏩ 6 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Walltime	write_stack_events	167.9 ms	30.5 ms	×5.5
⚡	Walltime	encode_events_realistic[1]	579.6 ms	142 ms	×4.1
⚡	Walltime	find_module_events[1000000]	170.6 ms	41.9 ms	×4.1
⚡	Walltime	encode_events_realistic[2]	296.8 ms	72.9 ms	×4.1
⚡	Walltime	find_module_events_with_stacks[1000000]	178.3 ms	44 ms	×4.1
⚡	Walltime	encode_events_realistic[4]	161.2 ms	39.8 ms	×4.1
⚡	Walltime	write_events[100000]	71.5 ms	17.7 ms	×4
⚡	Walltime	write_events[10000]	6.9 ms	1.7 ms	×4
⚡	Walltime	encode_events_realistic[8]	98.5 ms	27.7 ms	×3.6
⚡	Walltime	encode_events_realistic[16]	82.9 ms	27.9 ms	×3
⚡	Walltime	find_module_events_with_stacks[100000000]	10.1 s	4.2 s	×2.4
⚡	Walltime	find_module_events_with_stacks[10000000]	1,007.6 ms	423.6 ms	×2.4
⚡	Walltime	find_module_events[10000000]	958.6 ms	404 ms	×2.4
⚡	Walltime	find_module_events[100000000]	9.5 s	4 s	×2.4
⚡	Walltime	memtrack track dd	1,177.4 ms	725.8 ms	+62.22%
⚡	Walltime	memtrack track tar (with physical)	9.4 s	6 s	+55.66%
⚡	Walltime	memtrack track tar	9.3 s	6 s	+53.81%
⚡	Walltime	memtrack track dd (with physical)	1.3 s	1 s	+23.98%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing cod-4140-migrate-gen2-macro-runners (692f674) with main (229413f)²}

Footnotes

1. 6 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 (8b62e4a) during the generation of this report, so 229413f was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩