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

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

#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) {
