CSIT-992: Add libraries for optimized search

+ Place the libraries into resources/libraries/python/search/.
 + Except OptimizedTrexSearch in TrafficGenerator.py
+ Change traffic generator to support floats for duration and warmup.
+ Remove explicit type conversions where not needed.
+ Add robot keywords to performance_utils.robot
 + for calling the optimized search.
 + for reporting the resulting values.
 + for checking the minimal performance has been reached.
 + for running five second "Traffic should pass with no loss" after the search.
- Add methodology documentation in subsequent Change.
- Add simulator for testing algorithm correctness in a subsequent Change.
- Add tests using the libraries in subsequent Change.

Change-Id: Ia041008382ee4c9a562172099aea794c854d5f2f
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/resources/libraries/python/search/ReceiveRateMeasurement.py b/resources/libraries/python/search/ReceiveRateMeasurement.py
new file mode 100644
index 0000000000..58aa819017
--- /dev/null
+++ b/resources/libraries/python/search/ReceiveRateMeasurement.py
@@ -0,0 +1,54 @@
+# Copyright (c) 2018 Cisco and/or its affiliates.
+# 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.
+
+"""Module defining ReceiveRateMeasurement class."""
+
+
+class ReceiveRateMeasurement(object):
+    """Structure defining the result of single Rr measurement."""
+
+    def __init__(self, duration, target_tr, transmit_count, drop_count):
+        """Constructor, normalize primary and compute secondary quantities.
+
+        :param duration: Measurement duration [s].
+        :param target_tr: Target transmit rate [pps].
+            If bidirectional traffic is measured, this is bidirectional rate.
+        :param transmit_count: Number of packets transmitted [1].
+        :param drop_count: Number of packets transmitted but not received [1].
+        :type duration: float
+        :type target_tr: float
+        :type transmit_count: int
+        :type drop_count: int
+        """
+        self.duration = float(duration)
+        self.target_tr = float(target_tr)
+        self.transmit_count = int(transmit_count)
+        self.drop_count = int(drop_count)
+        self.receive_count = transmit_count - drop_count
+        self.transmit_rate = transmit_count / self.duration
+        self.drop_rate = drop_count / self.duration
+        self.receive_rate = self.receive_count / self.duration
+        self.drop_fraction = float(self.drop_count) / self.transmit_count
+        # TODO: Do we want to store also the real time (duration + overhead)?
+
+    def __str__(self):
+        """Return string reporting input and drop fraction."""
+        return "d={dur!s},Tr={rate!s},Df={frac!s}".format(
+            dur=self.duration, rate=self.target_tr, frac=self.drop_fraction)
+
+    def __repr__(self):
+        """Return string evaluable as a constructor call."""
+        return ("ReceiveRateMeasurement(duration={dur!r},target_tr={rate!r}"
+                ",transmit_count={trans!r},drop_count={drop!r})".format(
+                    dur=self.duration, rate=self.target_tr,
+                    trans=self.transmit_count, drop=self.drop_count))