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-rw-r--r--resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py66
1 files changed, 61 insertions, 5 deletions
diff --git a/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py b/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
index 31a6f8202e..c732e66026 100644
--- a/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
+++ b/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 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:
@@ -17,18 +17,39 @@
class ReceiveRateMeasurement:
"""Structure defining the result of single Rr measurement."""
- def __init__(self, duration, target_tr, transmit_count, loss_count):
+ def __init__(
+ self, duration, target_tr, transmit_count, loss_count,
+ approximated_duration=0.0, partial_transmit_count=0):
"""Constructor, normalize primary and compute secondary quantities.
+ If approximated_duration is nonzero, it is stored.
+ If approximated_duration is zero, duration value is stored.
+ Either way, additional secondary quantities are computed
+ from the store value.
+
+ If there is zero transmit_count, fractions are set to zero.
+
+ In some cases, traffic generator does not attempt all the needed
+ transactions. In that case, nonzero partial_transmit_count
+ holds (an estimate of) count of the actually attempted transactions.
+ This is used to populate some secondary quantities.
+
+ TODO: Use None instead of zero?
+
: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 loss_count: Number of packets transmitted but not received [1].
+ :param approximated_duration: Estimate of the actual time of the trial.
+ :param partial_transmit_count: Estimate count of actually attempted
+ transactions.
:type duration: float
:type target_tr: float
:type transmit_count: int
:type loss_count: int
+ :type approximated_duration: float
+ :type partial_transmit_count: int
"""
self.duration = float(duration)
self.target_tr = float(target_tr)
@@ -38,8 +59,41 @@ class ReceiveRateMeasurement:
self.transmit_rate = transmit_count / self.duration
self.loss_rate = loss_count / self.duration
self.receive_rate = self.receive_count / self.duration
- self.loss_fraction = float(self.loss_count) / self.transmit_count
- # TODO: Do we want to store also the real time (duration + overhead)?
+ self.loss_fraction = (
+ float(self.loss_count) / self.transmit_count
+ if self.transmit_count > 0 else 1.0
+ )
+ self.receive_fraction = (
+ float(self.receive_count) / self.transmit_count
+ if self.transmit_count > 0 else 0.0
+ )
+ self.approximated_duration = (
+ float(approximated_duration) if approximated_duration
+ else self.duration
+ )
+ self.approximated_receive_rate = (
+ self.receive_count / self.approximated_duration
+ if self.approximated_duration > 0.0 else 0.0
+ )
+ # If the traffic generator is unreliable and sends less packets,
+ # the absolute receive rate might be too low for next target.
+ self.partial_transmit_count = (
+ int(partial_transmit_count) if partial_transmit_count
+ else self.transmit_count
+ )
+ self.partial_receive_fraction = (
+ float(self.receive_count) / self.partial_transmit_count
+ if self.partial_transmit_count > 0 else 0.0
+ )
+ self.partial_receive_rate = (
+ self.target_tr * self.partial_receive_fraction
+ )
+ # We use relative packet ratios in order to support cases
+ # where target_tr is in transactions per second,
+ # but there are multiple packets per transaction.
+ self.relative_receive_rate = (
+ self.target_tr * self.receive_count / self.transmit_count
+ )
def __str__(self):
"""Return string reporting input and loss fraction."""
@@ -51,4 +105,6 @@ class ReceiveRateMeasurement:
return f"ReceiveRateMeasurement(duration={self.duration!r}," \
f"target_tr={self.target_tr!r}," \
f"transmit_count={self.transmit_count!r}," \
- f"loss_count={self.loss_count!r})"
+ f"loss_count={self.loss_count!r}," \
+ f"approximated_duration={self.approximated_duration!r}," \
+ f"partial_transmit_count={self.partial_transmit_count!r})"