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##############################################################################
# Copyright (c) 2015 Ericsson AB and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
"""Processor statistics and system load."""
from __future__ import absolute_import
import logging
import re
import time
from six.moves import map, zip
import yardstick.ssh as ssh
from yardstick.benchmark.scenarios import base
LOG = logging.getLogger(__name__)
class CPULoad(base.Scenario):
"""Collect processor statistics and system load.
This scenario reads system load averages and
CPU usage statistics on a Linux host.
CPU usage statistics are read using the utility 'mpstat'.
If 'mpstat' is not installed on the host usage statistics
are instead read directly from '/proc/stat'.
Load averages are read from the file '/proc/loadavg'
on the Linux host.
Parameters
interval - Time interval to measure CPU usage.
type: [int]
unit: seconds
default: 1
count (for mpstat only) - Number of CPU usage measurment.
type: [int]
unit: N/A
default: 1
"""
__scenario_type__ = "CPUload"
MPSTAT_FIELD_SIZE = 10
def __init__(self, scenario_cfg, context_cfg):
"""Scenario construction."""
self.scenario_cfg = scenario_cfg
self.context_cfg = context_cfg
self.setup_done = False
self.has_mpstat = False
self.has_count = False
def setup(self):
"""Scenario setup."""
host = self.context_cfg['host']
user = host.get('user', 'ubuntu')
ip = host.get('ip', None)
ssh_port = host.get("ssh_port", ssh.DEFAULT_PORT)
key_filename = host.get('key_filename', '~/.ssh/id_rsa')
LOG.info("user:%s, host:%s", user, ip)
self.client = ssh.SSH(user, ip, key_filename=key_filename,
port=ssh_port)
self.client.wait(timeout=600)
# Check if mpstat prog is installed
status, _, _ = self.client.execute("mpstat -V >/dev/null 2>&1")
if status != 0:
LOG.info("MPSTAT is NOT installed")
self.has_mpstat = False
else:
LOG.info("MPSTAT is installed")
self.has_mpstat = True
options = self.scenario_cfg['options']
self.interval = options.get("interval", 1)
if 'count' in options:
self.count = options.get("count", 1)
self.has_count = True
else:
self.has_count = False
self.setup_done = True
def _execute_command(self, cmd):
"""Execute a command on server."""
LOG.info("Executing: %s", cmd)
status, stdout, stderr = self.client.execute(cmd)
if status != 0:
raise RuntimeError("Failed executing command: ",
cmd, stderr)
return stdout
def _get_loadavg(self):
"""Get system load."""
return {'loadavg': self._execute_command("cat /proc/loadavg").split()}
def _get_cpu_usage_mpstat(self):
"""Get processor usage using mpstat."""
if self.interval > 0 and self.has_count:
cmd = "mpstat -P ON %s %s" % (self.interval, self.count)
else:
cmd = "mpstat -P ON %s 1" % self.interval
result = self._execute_command(cmd)
fields = []
maximum = {}
minimum = {}
average = {}
time_marker = re.compile("^([0-9]+):([0-9]+):([0-9]+)$")
ampm_marker = re.compile("(AM|PM)$")
# Parse CPU stats
for row in result.split('\n'):
line = row.split()
if line and re.match(time_marker, line[0]):
if re.match(ampm_marker, line[1]):
del line[:2]
else:
del line[:1]
if line[0] == 'CPU':
# header fields
fields = line[1:]
if len(fields) != CPULoad.MPSTAT_FIELD_SIZE:
raise RuntimeError("mpstat: unexpected field size",
fields)
else:
# value fields
cpu = 'cpu' if line[0] == 'all' else 'cpu' + line[0]
values = line[1:]
if values and len(values) == len(fields):
temp_dict = dict(list(zip(fields, values)))
if cpu not in maximum:
maximum[cpu] = temp_dict
else:
for item in temp_dict:
if float(maximum[cpu][item]) <\
float(temp_dict[item]):
maximum[cpu][item] = temp_dict[item]
if cpu not in minimum:
minimum[cpu] = temp_dict
else:
for item in temp_dict:
if float(minimum[cpu][item]) >\
float(temp_dict[item]):
minimum[cpu][item] = temp_dict[item]
else:
raise RuntimeError("mpstat: parse error", fields, line)
elif line and line[0] == 'Average:':
del line[:1]
if line[0] == 'CPU':
# header fields
fields = line[1:]
if len(fields) != CPULoad.MPSTAT_FIELD_SIZE:
raise RuntimeError("mpstat average: unexpected field\
size", fields)
else:
# value fields
cpu = 'cpu' if line[0] == 'all' else 'cpu' + line[0]
values = line[1:]
if values and len(values) == len(fields):
average[cpu] = dict(list(zip(fields, values)))
else:
raise RuntimeError("mpstat average: parse error",
fields, line)
return {'mpstat_maximun': maximum, 'mpstat_minimum': minimum,
'mpstat_average': average}
def _get_cpu_usage(self):
"""Get processor usage from /proc/stat."""
fields = ['%usr', '%nice', '%sys', '%idle', '%iowait',
'%irq', '%soft', '%steal', '%guest', '%gnice']
cmd = "grep '^cpu[0-9 ].' /proc/stat"
if self.interval > 0:
previous = self._execute_command(cmd).splitlines()
time.sleep(self.interval)
current = self._execute_command(cmd).splitlines()
else:
current = self._execute_command(cmd).splitlines()
previous = current
mpstat = {}
for (prev, cur) in zip(previous, current):
# Split string to list tokens
cur_list = cur.split()
prev_list = prev.split()
cpu = cur_list[0]
cur_stats = list(map(int, cur_list[1:]))
if self.interval > 0:
prev_stats = list(map(int, prev_list[1:]))
else:
prev_stats = [0] * len(cur_stats)
# NB: Don't add 'guest' and 'gnice' as they
# are already included in 'usr' and 'nice'.
uptime_prev = sum(prev_stats[0:8])
uptime_cur = sum(cur_stats[0:8])
# Remove 'guest' and 'gnice' from 'usr' and 'nice'
prev_stats[0] -= prev_stats[8]
prev_stats[1] -= prev_stats[9]
cur_stats[0] -= cur_stats[8]
cur_stats[1] -= cur_stats[9]
# number of samples (jiffies) in the interval
samples = (uptime_cur - uptime_prev) or 1
def _percent(x, y):
if x < y:
return 0.0
else:
return "%.2f" % (100.0 * (x - y) / samples)
load = list(map(_percent, cur_stats, prev_stats))
mpstat[cpu] = dict(list(zip(fields, load)))
return {'mpstat': mpstat}
def run(self, result):
"""Read processor statistics."""
if not self.setup_done:
self.setup()
result.update(self._get_loadavg())
if self.has_mpstat:
result.update(self._get_cpu_usage_mpstat())
else:
result.update(self._get_cpu_usage())
# Note: No SLA as this scenario is only collecting statistics
# def _test():
# """internal test function."""
# import pkg_resources
# key_filename = pkg_resources.resource_filename('yardstick.resources',
# 'files/yardstick_key')
# ctx = {
# 'host': {
# 'ip': '172.16.0.175',
# 'user': 'ubuntu',
# 'key_filename': key_filename
# }
# }
# logger = logging.getLogger('yardstick')
# logger.setLevel(logging.DEBUG)
# args = {}
# result = {}
# p = CPULoad(args, ctx)
# p.run(result)
# import json
# print(oslo_serialization.jsonutils.dump_as_bytes(result))
# if __name__ == '__main__':
# _test()
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