Source code for autotest.client.profilers.sar.sar

"""
Sets up a subprocess to run sar from the sysstat suite

Default options:
sar -A -f
"""
import os
import subprocess
import time

from autotest.client import utils, profiler, os_dep


[docs]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
[docs] def initialize(self, interval=1, **dargs): """ 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)
[docs] 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)
[docs] 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
[docs] 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))