-# All rights reserved. This program and the accompanying materials
-# are made available under the terms of the Apache License, Version 2.0
-# which accompanies this distribution, and is available at
-# http://www.apache.org/licenses/LICENSE-2.0
-##############################################################################
-
-'''A runner that every run arithmetically steps a specified input value to
-the scenario. This just means a step value is added to the previous value.
-'''
-
-import os
-import multiprocessing
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+# yardstick comment: this is a modified copy of
+# rally/rally/benchmark/runners/constant.py
+
+"""A runner that every run arithmetically steps specified input value(s) to
+the scenario. This just means step value(s) is added to the previous value(s).
+It is possible to combine several named input values and run with those either
+as nested for loops or combine each i:th index of each "input value list"
+until the end of the shortest list is reached (optimally all lists should be
+defined with the same number of values when using such iter_type).
+"""
+
+from __future__ import absolute_import
+
+import itertools