   /// benchmark. That's why we don't worry about reseting the `baseline` in
   /// `resetMeasurements`.
   func measureMemoryUsage() -> Int {
-    let current = SampleRunner.getResourceUtilization()
+    let current = TestRunner.getResourceUtilization()
     let maxRSS = current.ru_maxrss - baseline.ru_maxrss
     let pages = { maxRSS / sysconf(_SC_PAGESIZE) }
     func deltaEquation(_ stat: KeyPath<rusage, Int>) -> String {

      print(testDescription)
    }
  case .run:
    SampleRunner(config).runBenchmarks()
    if let x = config.afterRunSleep {
      sleep(x)
    }

#endif
}

extension UInt64 {
  var microseconds: Int { return Int(self / 1000) }
}

/// Performance test runner that measures benchmarks and reports the results.
final class TestRunner {
  let c: TestConfig
  let timer = Timer()
  var start, end, lastYield: Timer.TimeT
  let baseline = TestRunner.getResourceUtilization()
  let schedulerQuantum = UInt64(10_000_000) // nanoseconds (== 10ms, macos)

  init(_ config: TestConfig) {
