Add LinuxPerf extension for branch + instruction counts
#375
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This updates the core BenchmarkTools types to include `instructions` and `branches` fields. These fields support serialization and all of the usual stats / judgements via the Trial / TrialEstimate / TrialRatio interface. If the extension is not available or `perf` is not configured correctly on your system, these are `NaN`. This also keeps the serialization format backwards-compatible, reporting any missing measurements as `NaN`.
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It'd be good to get some feedback on this (cc @vchuravy) I'd really like to get cycle counts into our nanosoldier reports - the wall time measurements are quite noisy |
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This PR adds a straightforward extension for
LinuxPerfand updates the coreTrial/TrialEstimate/ etc. types to include "instructions" and "branches" fields, with the usual stats + serialization + judgement support.If
LinuxPerfis not loaded, instruction/branch counts are returned asnothingfrominstructions(t),branches(t), etc. (internally they are stored asNaN)This is an alternative to #347, which tries to provide a fully-generic interface. In contrast, this PR focuses on updating the core datatypes to make room for instruction / branch counts and LinuxPerf is just one possible source for those counts.