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Callgrind-based benchmark harness written in Rust

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In a theoretical future where test/bench binaries are encouraged to report back results to `cargo` as json which then formats and reports them, what would callper see as needed for...

callgrind_annotate is a Callgrind-related program that produces meaningful statistics from Callgrind output files; it can show most resource-intensive functions (where resource can be e.g. instruction counts etc.). I think it...

enhancement

Meta-issue for tracking Valgrind options support that is not specific to Callgrind. - [ ] #6

command-line

Since we're using harness=false, there's no way to filter benchmarks by their name currently.

enhancement

https://valgrind.org/docs/manual/manual-core.html `--trace-children` allows one to profile processes spawned by the profiled process. This should come in handy for profiling things like miri, which are spawned by other processes. Note that...

command-line