fix: threshold-tolerances sometimes are not respected

[MahdiBM]

Description

Resolves #275 by loading benchmarks when they should be loaded.

How Has This Been Tested?

Click to show benchmark code

```swift let benchmarks = { Benchmark.defaultConfiguration = .init( metrics: [.cpuTotal], timeUnits: .nanoseconds, warmupIterations: 1, scalingFactor: .one, maxDuration: .seconds(1000), maxIterations: 1 ) func defaultCounter() -> Int { 10 } func dummyCounter(_ count: Int) { for index in 0 ..< count { blackHole(index) } } Benchmark( "CountNumbersBenchmark", configuration: .init( scalingFactor: .kilo, thresholds: [ .cpuTotal: .init( /// Tolerate up to 1% of difference compared to the threshold. relative: [.p90: 1], /// Tolerate up to 80ms of difference compared to the threshold. absolute: [.p90: 80_000_000] ) ] ) ) { _ in for _ in 0 ... 1_000_000 { dummyCounter(defaultCounter() * 1000) } } } ```

Right now, the following is the result of the benchmark, with fixes applied:

✅ Pull request has no significant performance differences ✅

Benchmark check running at 2024-09-18 02:48:03 UTC

Baseline mmbm-no-twice-benchmark-run is EQUAL to the defined absolute baseline thresholds. (--check-absolute)

Baseline mmbm-no-twice-benchmark-run

Host 0d12d771afd8 with 64 aarch64 processors with 125 GB memory, running:
#24~22.04.1-Ubuntu SMP Sat Jul 20 10:48:15 UTC 2024

MyBenchmarks

CountNumbersBenchmark

Metric	p0	p25	p50	p75	p90	p99	p100	Samples
Time (total CPU) (ns) *	7710000	7710000	7710000	7710000	7710000	7710000	7710000	1

As you can see, the result shows 7710000 aka 7.71s of cpu time (now that I look, that ns label must be a bug, probably caused by the scaling factor usage. See benchmark code above). But the threshold file is:

{
  "cpuTotal" : 7700000000
}

Without this fix, this check would fail since the numbers are not equal. With this fix, the benchmark completes successfully since it does load the threshold tolerances as declared in the benchmark code:

            thresholds: [
                .cpuTotal: .init(
                    /// Tolerate up to 1% of difference compared to the threshold.
                    relative: [.p90: 1],
                    /// Tolerate up to 80ms of difference compared to the threshold.
                    absolute: [.p90: 80_000_000]
                )
            ]

Minimal checklist:

• [x] I have performed a self-review of my own code
• [ ] I have added DocC code-level documentation for any public interfaces exported by the package
• [ ] I have added unit and/or integration tests that prove my fix is effective or that my feature works

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.32%. Comparing base (75e8622) to head (a19235e).

Additional details and impacted files

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[hassila]

Thanks for the PR, I will try to review soonish, I am out of office this week, so it will take some time.

[MahdiBM]

No worries, no rush, thanks 🙏.

[MahdiBM]

I wonder if this has now made the tool run the benchmarks again? I can't tell properly, I'll have to do some investigations.

[MahdiBM]

Ok apparently there are regressions in Swift 6 Linux toolchains, ranging from significant to absolutely-massive ... that might have been why it made me think it's rerunning the benchmarks. Still investigating.