swaits
50501bb01e
The profiling campaign ranks functions on instruction count (Ir) only, so callgrind's cache simulation is pure overhead — it roughly doubles each run's wall time. Pass `--cache-sim=no` via the gungraun `LibraryBenchmarkConfig` to halve the measure->optimize loop's latency.
49 lines
1.7 KiB
Rust
49 lines
1.7 KiB
Rust
//! Whole-program callgrind profile of the `compare` example workload.
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//!
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//! Runs every algorithm runner once (seed 0) under callgrind via gungraun —
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//! the same workload `examples/compare.rs` runs, minus the multi-seed
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//! averaging and table printing. gungraun reports the total instruction
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//! count and diffs it against the previous run; the saved `callgrind.out`
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//! (`target/gungraun/compare_profile/compare_group/full_compare_workload/`)
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//! carries the per-function breakdown — `callgrind_annotate` it to rank
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//! functions by self-instruction cost.
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//!
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//! ```bash
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//! cargo bench --bench compare_profile
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//! ```
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// The shared `compare_workload` module also carries the example's
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// presentation layer (`run_all`, the `run_*_comparison` printers,
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// `print_table`, …), which this profiling benchmark deliberately does not
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// use — it drives only the runner functions via `profile_workload`. The
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// runner functions themselves are *not* allow-listed, so a runner that
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// `profile_workload` forgets to call still warns.
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#![allow(dead_code)]
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use std::hint::black_box;
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use gungraun::Callgrind;
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use gungraun::prelude::*;
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#[path = "../examples/_shared/compare_workload.rs"]
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mod workload;
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#[library_benchmark]
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fn full_compare_workload() -> u64 {
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black_box(workload::profile_workload())
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}
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library_benchmark_group!(
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name = compare_group;
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benchmarks = full_compare_workload
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);
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// `--cache-sim=no`: the campaign ranks functions on instruction count
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// (`Ir`) only, so callgrind's cache simulation is pure overhead here —
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// disabling it roughly halves each profiling run.
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main!(
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config = LibraryBenchmarkConfig::default()
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.tool(Callgrind::with_args(["--cache-sim=no"])),
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library_benchmark_groups = compare_group
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);
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