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authorVratko Polak <vrpolak@cisco.com>2018-04-27 15:11:12 +0200
committerPeter Mikus <pmikus@cisco.com>2018-05-04 11:46:26 +0000
commit35175924550d67f98fb1c2c50b0634656d29169e (patch)
treefe1008e80c9c6f09227dff84672bd0eaa831ff23 /resources/libraries/python/TrafficGenerator.py
parent4bfd1dcd604dac12d1dd00ba63c0d5e4170a1f2b (diff)
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>
Diffstat (limited to 'resources/libraries/python/TrafficGenerator.py')
-rw-r--r--resources/libraries/python/TrafficGenerator.py154
1 files changed, 134 insertions, 20 deletions
diff --git a/resources/libraries/python/TrafficGenerator.py b/resources/libraries/python/TrafficGenerator.py
index 4da1c8766f..aa839dd80e 100644
--- a/resources/libraries/python/TrafficGenerator.py
+++ b/resources/libraries/python/TrafficGenerator.py
@@ -16,14 +16,17 @@
from robot.api import logger
from robot.libraries.BuiltIn import BuiltIn
-from resources.libraries.python.constants import Constants
-from resources.libraries.python.ssh import SSH
-from resources.libraries.python.topology import NodeType
-from resources.libraries.python.topology import NodeSubTypeTG
-from resources.libraries.python.topology import Topology
-from resources.libraries.python.DropRateSearch import DropRateSearch
+from .DropRateSearch import DropRateSearch
+from .constants import Constants
+from .ssh import SSH
+from .topology import NodeType
+from .topology import NodeSubTypeTG
+from .topology import Topology
+from .search.AbstractRateProvider import AbstractRateProvider
+from .search.OptimizedSearchAlgorithm import OptimizedSearchAlgorithm
+from .search.ReceiveRateMeasurement import ReceiveRateMeasurement
-__all__ = ['TrafficGenerator', 'TGDropRateSearchImpl']
+__all__ = ['TGDropRateSearchImpl', 'TrafficGenerator', 'OptimizedSearch']
class TGDropRateSearchImpl(DropRateSearch):
@@ -40,9 +43,10 @@ class TGDropRateSearchImpl(DropRateSearch):
:param frame_size: Size of frame.
:param loss_acceptance: Permitted drop ratio or frames count.
:param loss_acceptance_type: Type of permitted loss.
- :param traffic_type: Traffic profile ([2,3]-node-L[2,3], ...).
+ :param traffic_type: Module name as a traffic type identifier.
+ See resources/traffic_profiles/trex for implemented modules.
:param skip_warmup: Start TRex without warmup traffic if true.
- :type rate: int
+ :type rate: float
:type frame_size: str
:type loss_acceptance: float
:type loss_acceptance_type: LossAcceptanceType
@@ -66,7 +70,7 @@ class TGDropRateSearchImpl(DropRateSearch):
tg_instance.trex_stl_start_remote_exec(self.get_duration(),
unit_rate, frame_size,
traffic_type,
- warmup_time=0)
+ warmup_time=0.0)
else:
tg_instance.trex_stl_start_remote_exec(self.get_duration(),
unit_rate, frame_size,
@@ -97,8 +101,13 @@ class TGDropRateSearchImpl(DropRateSearch):
return tg_instance.get_latency_int()
-class TrafficGenerator(object):
- """Traffic Generator."""
+class TrafficGenerator(AbstractRateProvider):
+ """Traffic Generator.
+
+ FIXME: Describe API."""
+
+ # TODO: Decrease friction between various search and rate provider APIs.
+ # FIXME: Remove "trex" from lines which could work with other TGs.
# use one instance of TrafficGenerator for all tests in test suite
ROBOT_LIBRARY_SCOPE = 'TEST SUITE'
@@ -112,6 +121,10 @@ class TrafficGenerator(object):
self._node = None
# T-REX interface order mapping
self._ifaces_reordered = False
+ # Parameters not given by measure().
+ self.frame_size = None
+ self.traffic_type = None
+ self.warmup_time = None
@property
def node(self):
@@ -374,23 +387,24 @@ class TrafficGenerator(object):
def trex_stl_start_remote_exec(self, duration, rate, framesize,
traffic_type, async_call=False,
- latency=True, warmup_time=5):
+ latency=True, warmup_time=5.0):
"""Execute script on remote node over ssh to start traffic.
:param duration: Time expresed in seconds for how long to send traffic.
:param rate: Traffic rate expressed with units (pps, %)
:param framesize: L2 frame size to send (without padding and IPG).
- :param traffic_type: Traffic profile.
+ :param traffic_type: Module name as a traffic type identifier.
+ See resources/traffic_profiles/trex for implemented modules.
:param async_call: If enabled then don't wait for all incomming trafic.
:param latency: With latency measurement.
:param warmup_time: Warmup time period.
- :type duration: int
+ :type duration: float
:type rate: str
:type framesize: str
:type traffic_type: str
:type async_call: bool
:type latency: bool
- :type warmup_time: int
+ :type warmup_time: float
:returns: Nothing
:raises RuntimeError: In case of TG driver issue.
"""
@@ -418,7 +432,7 @@ class TrafficGenerator(object):
"{9}'". # --latency
format(Constants.REMOTE_FW_DIR, profile_path, duration, framesize,
rate, warmup_time, _p0 - 1, _p1 - 1, _async, _latency),
- timeout=int(duration) + 60)
+ timeout=float(duration) + 60)
if int(ret) != 0:
raise RuntimeError('TRex stateless runtime error')
@@ -462,7 +476,8 @@ class TrafficGenerator(object):
:param duration: Duration of test traffic generation in seconds.
:param rate: Offered load per interface (e.g. 1%, 3gbps, 4mpps, ...).
:param framesize: Frame size (L2) in Bytes.
- :param traffic_type: Traffic profile.
+ :param traffic_type: Module name as a traffic type identifier.
+ See resources/traffic_profiles/trex for implemented modules.
:param warmup_time: Warmup phase in seconds.
:param async_call: Async mode.
:param latency: With latency measurement.
@@ -470,7 +485,7 @@ class TrafficGenerator(object):
:type rate: str
:type framesize: str
:type traffic_type: str
- :type warmup_time: int
+ :type warmup_time: float
:type async_call: bool
:type latency: bool
:returns: TG output.
@@ -490,7 +505,7 @@ class TrafficGenerator(object):
if node['subtype'] is None:
raise RuntimeError('TG subtype not defined')
elif node['subtype'] == NodeSubTypeTG.TREX:
- self.trex_stl_start_remote_exec(int(duration), rate, framesize,
+ self.trex_stl_start_remote_exec(duration, rate, framesize,
traffic_type, async_call, latency,
warmup_time=warmup_time)
else:
@@ -533,3 +548,102 @@ class TrafficGenerator(object):
if loss > float(loss_acceptance):
raise Exception("Traffic loss {} above loss acceptance: {}".format(
loss, loss_acceptance))
+
+ def set_rate_provider_defaults(self, frame_size, traffic_type,
+ warmup_time=0.0):
+ """Store values accessed by measure().
+
+ :param frame_size: Frame size identifier or value [B].
+ :param traffic_type: Module name as a traffic type identifier.
+ See resources/traffic_profiles/trex for implemented modules.
+ :param warmup_time: Traffic duration before measurement starts [s].
+ :type frame_size: str or int
+ :type traffic_type: str
+ :type warmup_time: float
+ """
+ self.frame_size = frame_size
+ self.traffic_type = str(traffic_type)
+ self.warmup_time = float(warmup_time)
+
+ def measure(self, duration, transmit_rate):
+ """Run bi-directional measurement, parse and return results.
+
+ :param duration: Trial duration [s].
+ :param transmit_rate: Target bidirectional transmit rate [pps].
+ :type duration: float
+ :type transmit_rate: float
+ :returns: Structure containing the result of the measurement.
+ :rtype: ReceiveRateMeasurement
+ :raises RuntimeError: If TG is not set, or if node is not TG,
+ or if subtype is not specified.
+ :raises NotImplementedError: If TG is not supported.
+ """
+ duration = float(duration)
+ transmit_rate = float(transmit_rate)
+ # Trex needs target Tr per stream, but reports aggregate Tx and Dx.
+ unit_rate = str(transmit_rate / 2.0) + "pps"
+ self.send_traffic_on_tg(
+ duration, unit_rate, self.frame_size, self.traffic_type,
+ self.warmup_time, latency=True)
+ transmit_count = int(self.get_sent())
+ drop_count = int(self.get_loss())
+ measurement = ReceiveRateMeasurement(
+ duration, transmit_rate, transmit_count, drop_count)
+ measurement.latency = self.get_latency_int()
+ return measurement
+
+
+class OptimizedSearch(object):
+ """Class to be imported as Robot Library, containing a single keyword."""
+
+ @staticmethod
+ def perform_optimized_ndrpdr_search(
+ frame_size, traffic_type, fail_rate, line_rate,
+ allowed_drop_fraction=0.005, final_relative_width=0.005,
+ final_trial_duration=30.0, initial_trial_duration=1.0,
+ intermediate_phases=2, timeout=600.0):
+ """Setup initialized TG, perform optimized search, return intervals.
+
+ :param frame_size: Frame size identifier or value [B].
+ :param traffic_type: Module name as a traffic type identifier.
+ See resources/traffic_profiles/trex for implemented modules.
+ :param fail_rate: Minimal target transmit rate [pps].
+ :param line_rate: Maximal target transmit rate [pps].
+ :param allowed_drop_fraction: Fraction of dropped packets for PDR [1].
+ :param final_relative_width: Final lower bound transmit rate
+ cannot be more distant that this multiple of upper bound [1].
+ :param final_trial_duration: Trial duration for the final phase [s].
+ :param initial_trial_duration: Trial duration for the initial phase
+ and also for the first intermediate phase [s].
+ :param intermediate_phases: Number of intermediate phases to perform
+ before the final phase [1].
+ :param timeout: The search will fail itself when not finished
+ before this overall time [s].
+ :type frame_size: str or int
+ :type traffic_type: str
+ :type fail_rate: float
+ :type line_rate: float
+ :type allowed_drop_fraction: float
+ :type final_relative_width: float
+ :type final_trial_duration: float
+ :type initial_trial_duration: float
+ :type intermediate_phases: int
+ :type timeout: float
+ :returns: Structure containing narrowed down intervals
+ and their measurements.
+ :rtype: NdrPdrResult
+ :raises RuntimeError: If total duration is larger than timeout.
+ """
+ # we need instance of TrafficGenerator instantiated by Robot Framework
+ # to be able to use trex_stl-*()
+ tg_instance = BuiltIn().get_library_instance(
+ 'resources.libraries.python.TrafficGenerator')
+ tg_instance.set_rate_provider_defaults(frame_size, traffic_type)
+ algorithm = OptimizedSearchAlgorithm(
+ tg_instance, final_trial_duration=final_trial_duration,
+ final_relative_width=final_relative_width,
+ intermediate_phases=intermediate_phases,
+ initial_trial_duration=initial_trial_duration, timeout=timeout)
+ result = algorithm.narrow_down_ndr_and_pdr(
+ fail_rate, line_rate, allowed_drop_fraction)
+ return result