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Have you seen the prototype for googlebenchmark integration I did in the past: https://reviews.llvm.org/D18428 <https://reviews.llvm.org/D18428> (though probably out of date for todays test-suite) +1 for copying the googlebechmark into the test-suite. However I do not think this should simply go into MultiSource: We currently have a number of additional plugins in the lit test runner such