82 lines
2.9 KiB
Python
82 lines
2.9 KiB
Python
"""
|
|
Sets up a subprocess to run sar from the sysstat suite
|
|
|
|
Default options:
|
|
sar -A -f
|
|
"""
|
|
import os, shutil, subprocess, time
|
|
from autotest_lib.client.bin import utils, profiler, os_dep
|
|
|
|
|
|
class sar(profiler.profiler):
|
|
"""
|
|
The sar command writes to standard output the contents of selected
|
|
cumulative activity counters in the operating system. This profiler
|
|
executes sar and redirects its output in a file located in the profiler
|
|
results dir.
|
|
"""
|
|
version = 1
|
|
|
|
def initialize(self, interval=1):
|
|
"""
|
|
Set sar interval and verify what flags the installed sar supports.
|
|
|
|
@param interval: Interval used by sar to produce system data.
|
|
"""
|
|
self.interval = interval
|
|
self.sar_path = os_dep.command('sar')
|
|
# If using older versions of sar, command below means: Measure default
|
|
# params using interval of 1 second continuously. For newer versions,
|
|
# behavior has changed - to generate reports continuously just omit the
|
|
# count parameter.
|
|
t_cmd = self.sar_path + " 1 0"
|
|
t_process = subprocess.Popen(t_cmd, shell=True,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE)
|
|
# Wait a little to see if process is going to fail or work
|
|
time.sleep(3)
|
|
if t_process.poll():
|
|
# Sar process returned, so 0 doesn't mean generate continuously
|
|
self.cmd = self.sar_path + " -o %s %d"
|
|
else:
|
|
# Sar process didn't return, so 0 means generate continuously
|
|
# Just terminate the process
|
|
self.cmd = self.sar_path + " -o %s %d 0"
|
|
os.kill(t_process.pid, 15)
|
|
|
|
|
|
def start(self, test):
|
|
"""
|
|
Starts sar subprocess.
|
|
|
|
@param test: Autotest test on which this profiler will operate on.
|
|
"""
|
|
logfile = open(os.path.join(test.profdir, "sar"), 'w')
|
|
# Save the sar data as binary, convert to text after the test.
|
|
raw = os.path.join(test.profdir, "sar.raw")
|
|
cmd = self.cmd % (raw, self.interval)
|
|
self.sar_process = subprocess.Popen(cmd, shell=True, stdout=logfile,
|
|
stderr=subprocess.STDOUT)
|
|
|
|
|
|
def stop(self, test):
|
|
"""
|
|
Stops profiler execution by sending a SIGTERM to sar process.
|
|
|
|
@param test: Autotest test on which this profiler will operate on.
|
|
"""
|
|
try:
|
|
os.kill(self.sar_process.pid, 15)
|
|
except OSError:
|
|
pass
|
|
|
|
def report(self, test):
|
|
"""
|
|
Report function. Convert the binary sar data to text.
|
|
|
|
@param test: Autotest test on which this profiler will operate on.
|
|
"""
|
|
raw = os.path.join(test.profdir, "sar.raw")
|
|
output = os.path.join(test.profdir, "sar")
|
|
utils.system('/usr/bin/sar -A -f %s > %s' % (raw, output))
|