code: def run(self):
          
          i = 0
          operation_count = int(self._parameters['operationcount'])
          while i < operation_count:
              i += 1
              weight = random.uniform(0, self._total_weight)
              for j in range(len(self._weights)):
                  if weight <= self._weights[j]:
                      do_operation(self._database, self._keys,
                                   self._parameters['table'],
                                   self._operations[j], self._latencies_ms)
                      break
docs: Run a single thread of the workload.