Benchmark support for CPU instruction counts

Related Projects Benchmark
1

Happy to announce that the latest version of Benchmark now supports CPU instructions retired statistics.

This is done using perf_events on Linux and using rusage on macOS.

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For benchmarks running in a VM, this metric might not return any data due to lack of access to CPU performance counters.

See details here:

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Wow, unbelievable! This is a huge step forward in benchmarking for all Swift ecosystem.

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