Cod 711 file name missing in codspeed rust flamegraph

[GuillaumeLagrange]

• Root cause was missing debug symbols, because cargo seems to strip them by default if they are not explicitly enabled in Cargo.toml and only through rust flags (this is a theory, have not dived into cargo code)
• Noticed that fibo(500) is actually a very huge and overflowing integer when troubleshooting benches without release profile, so fixed it

[Copilot]

Pull Request Overview

This PR addresses missing debug symbols and integer overflow issues in benchmarks.

• Update fibonacci functions’ parameter and return types to u64 to prevent overflow.
• Rename the benchmark function from fibo_500 to fibo_50 to reflect the adjusted test value.
• Disable debug info stripping in the build script to preserve symbols in release builds.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
crates/divan_compat/benches/basic_example.rs	Adjusts fibonacci function types and benchmark values to prevent overflow.
crates/cargo-codspeed/src/build.rs	Adds a rust flag to disable stripping of debug symbols in release builds.

Comments suppressed due to low confidence (2)

crates/divan_compat/benches/basic_example.rs:17

• [nitpick] The function was renamed from fibo_500 to fibo_50, which may be confusing without context. Consider adding a comment or updating the function name to clearly reflect the new benchmark parameters.

fn fibo_50() -> u64 {

crates/cargo-codspeed/src/build.rs:125

• [nitpick] Disabling stripping of debug info via rust flags is a workaround for Cargo's release profile settings. Please verify that this flag does not conflict with other settings or introduces issues in different build environments.

rust_flags.push_str(" -C strip=none");

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #93 will degrade performances by 18.88%

_{Comparing cod-711-file-name-missing-in-codspeed-rust-flamegraph (d7a1b4b) with main (250ad31)}

Summary

⚡ 3 improvements
❌ 3 regressions
✅ 156 untouched benchmarks
🆕 1 new benchmarks
⁉️ 1 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	bench_array1[10]	195.8 ns	225 ns	-12.96%
⚡	bench_array1[1]	119.2 ns	90 ns	+32.41%
❌	bench_array2[10]	195.8 ns	225 ns	-12.96%
⚡	bench_array2[1]	119.2 ns	90 ns	+32.41%
❌	bench_array2[4]	125.3 ns	154.4 ns	-18.88%
⚡	fibo_10	119.2 ns	90 ns	+32.41%
🆕	fibo_50	N/A	90.3 ns	N/A
⁉️	fibo_500	257.8 ns	N/A	N/A

[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #93 will degrade performances by 53.23%

_{Comparing cod-711-file-name-missing-in-codspeed-rust-flamegraph (d7a1b4b) with main (250ad31)}

Summary

⚡ 6 improvements
❌ 11 regressions
✅ 127 untouched benchmarks
🆕 1 new benchmarks
⁉️ 1 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	build_vec	210 ns	219 ns	-4.11%
❌	from_elem[4096]	316 ns	330 ns	-4.24%
⚡	bench_array1[1]	4.5 µs	3.6 µs	+25.08%
⚡	bench_array2[1]	4.5 µs	3.6 µs	+25.08%
⚡	init_array[1000]	7.1 µs	2 µs	×3.5
❌	fibo_10	3.6 µs	4.5 µs	-19.79%
🆕	fibo_50	N/A	4.5 µs	N/A
⁉️	fibo_500	7.1 µs	N/A	N/A
❌	recursive[10]	6.4 µs	6.6 µs	-3.44%
⚡	generate_combinations[6]	2.7 µs	1.3 µs	×2
❌	generate_parentheses[5]	20.8 µs	21.9 µs	-5.36%
❌	graph_coloring[3]	1 µs	2.2 µs	-53.23%
❌	graph_coloring[5]	3.9 µs	4.5 µs	-13.65%
❌	graph_coloring[6]	4.3 µs	4.8 µs	-11.67%
⚡	hamiltonian_cycle[4]	4.5 µs	4.4 µs	+3%
⚡	n_queens_solver[5]	9.4 µs	9.1 µs	+3.04%
❌	rat_in_maze[8]	3.7 µs	3.9 µs	-3.41%
❌	add_two_integers[(0, 0)]	5.6 µs	5.9 µs	-5.47%
❌	generate_gray_code[2]	3.8 µs	3.9 µs	-3.4%