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# 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:
#
# 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.
"""Linux perf utility."""
from resources.libraries.python.Constants import Constants
from resources.libraries.python.OptionString import OptionString
from resources.libraries.python.ssh import exec_cmd
from resources.libraries.python.topology import NodeType
__all__ = [u"PerfUtil"]
class PerfUtil:
"""Class contains methods for perf utility."""
@staticmethod
def perf_stat(node, cpu_list=None, duration=1):
"""Get perf stat read for duration.
:param node: Node in the topology.
:param cpu_list: CPU List as a string separated by comma.
:param duration: Measure time in seconds.
:type node: dict
:type cpu_list: str
:type duration: int
"""
if cpu_list:
cpu_list = list(dict.fromkeys(cpu_list.split(u",")))
cpu_list = ",".join(str(cpu) for cpu in cpu_list)
cmd_opts = OptionString(prefix=u"--")
cmd_opts.add(u"no-aggr")
cmd_opts.add_with_value_if(
u"cpu", cpu_list, cpu_list
)
cmd_opts.add_if(
u"all-cpus", not(cpu_list)
)
cmd_opts.add_with_value_if(
u"event", f"'{{{Constants.PERF_STAT_EVENTS}}}'",
Constants.PERF_STAT_EVENTS
)
cmd_opts.add_with_value(
u"interval-print", 1000
)
cmd_opts.add_with_value(
u"field-separator", u"';'"
)
cmd_base = OptionString()
cmd_base.add(f"perf stat")
cmd_base.extend(cmd_opts)
cmd_base.add(u"--")
cmd_base.add_with_value(u"sleep", int(duration))
exec_cmd(node, cmd_base, sudo=True)
@staticmethod
def perf_stat_on_all_duts(nodes, cpu_list=None, duration=1):
"""Get perf stat read for duration on all DUTs.
:param nodes: Nodes in the topology.
:param cpu_list: CPU List.
:param duration: Measure time in seconds.
:type nodes: dict
:type cpu_list: str
:type duration: int
"""
for node in nodes.values():
if node[u"type"] == NodeType.DUT:
PerfUtil.perf_stat(node, cpu_list=cpu_list, duration=duration)
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