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# Copyright (c) 2022 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.
"""Perf Stat performance bundle."""
from logging import getLogger
import sys
import subprocess
from .constants import Constants
class BundlePerfStat:
"""
Creates a Perf stat object. This is the main object for defining a Perf Stat
program and interacting with its output.
Syntax: perf stat [-e <EVENT> | --event=EVENT] [-a] — <command> [<options>]
"""
def __init__(self, program, serializer, hook):
"""Initialize Bundle Perf Stat event class.
:param program: events
:param serializer: Metric serializer.
:param hook: Process ID.
:type program: dict
:type serializer: Serializer
:type hook: int
"""
self.metrics = program[u"metrics"]
self.events = program[u"events"]
self.api_replies_list = list()
self.serializer = serializer
self.hook = hook
def attach(self, duration=1):
"""
Performs perf stat.
:param duration: Time how long perf stat is collecting data (in
seconds). Default value is 1 second.
:type duration: int
"""
try:
self.serializer.create(metrics=self.metrics)
event = self.events[0]
text = subprocess.getoutput(
f"""sudo perf stat -x\; -e\
'{{cpu/event={hex(event[u"eventcode"])},\
umask={hex(event[u"umask"])}/u}}'\
-a --per-thread\
sleep {duration}"""
)
except subprocess.CalledProcessError:
getLogger("console_stderr").error(f"Could not successfully run "
f"perf stat command.")
sys.exit(Constants.err_linux_perf_stat)
if text == u"":
getLogger("console_stdout").info(event[u"eventcode"])
else:
for line in text.splitlines():
if line.count(u";") < 6:
getLogger("console_stdout").info(
f"Could not get counters for current thread."
f"{line}"
)
continue
item = dict()
labels = dict()
item[u"name"] = self.metrics['counter'][0]['name']
item[u"value"] = line.split(";")[1]
labels["thread"] = u"-".join(
line.split(";")[0].split("-")[0:-1]
)
labels["pid"] = line.split(";")[0].split("-")[-1]
item[u"labels"] = labels
getLogger("console_stdout").info(item)
self.api_replies_list.append(item)
def detach(self):
pass
def fetch_data(self):
pass
def process_data(self):
"""
Post process API replies.
"""
for item in self.api_replies_list:
self.serializer.serialize(
metric=item[u"name"], labels=item[u"labels"], item=item
)
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