def test_events(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        monitor.start()
        time.sleep(0.5)

        t0 = time.time()
        monitor.record_event('t0')
        time.sleep(0.5)

        t1 = time.time()
        monitor.record_event('t1')
        time.sleep(0.5)
        monitor.stop()

        events = monitor.events
        self.assertEqual(len(events), 2)

        event = events[0]

        self.assertEqual(event[1], 't0')
        self.assertAlmostEqual(event[0], t0, delta=0.25)

        data = list(monitor.between_events_usage('t0', 't1'))
        self.assertGreater(len(data), 0)

    def test_aggregate_cpu(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        monitor.start()
        time.sleep(1)
        monitor.stop()

        values = monitor.aggregate_cpu_percent()
        self.assertIsInstance(values, list)
        self.assertEqual(len(values), multiprocessing.cpu_count())
        for v in values:
            self.assertIsInstance(v, float)

        value = monitor.aggregate_cpu_percent(per_cpu=False)
        self.assertIsInstance(value, float)

        values = monitor.aggregate_cpu_times()
        self.assertIsInstance(values, list)
        self.assertGreater(len(values), 0)
        self.assertTrue(hasattr(values[0], 'user'))

        t = type(values[0])

        value = monitor.aggregate_cpu_times(per_cpu=False)
        self.assertIsInstance(value, t)

    def test_phases(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        monitor.start()
        time.sleep(1)

        with monitor.phase('phase1'):
            time.sleep(1)

            with monitor.phase('phase2'):
                time.sleep(1)

        monitor.stop()

        self.assertEqual(len(monitor.phases), 2)
        self.assertEqual(['phase2', 'phase1'], monitor.phases.keys())

        all = list(monitor.range_usage())
        data1 = list(monitor.phase_usage('phase1'))
        data2 = list(monitor.phase_usage('phase2'))

        self.assertGreater(len(all), len(data1))
        self.assertGreater(len(data1), len(data2))

        # This could fail if time.time() takes more than 0.1s. It really
        # shouldn't.
        self.assertAlmostEqual(data1[-1].end, data2[-1].end, delta=0.25)

    def _start_resource_monitoring(self, action, success=None):
        self.activate_virtualenv()

        try:
            from mozsystemmonitor.resourcemonitor import SystemResourceMonitor

            self.info("Starting resource monitoring.")
            self._resource_monitor = SystemResourceMonitor(poll_interval=1.0)
            self._resource_monitor.start()
        except Exception:
            self.warning("Unable to start resource monitor: %s" %
                         traceback.format_exc())

    def test_empty(self):
        monitor = SystemResourceMonitor(poll_interval=2.0)
        monitor.start()
        monitor.stop()

        data = list(monitor.range_usage())
        self.assertEqual(len(data), 0)

    def test_memory(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        monitor.start()
        time.sleep(1.0)
        monitor.stop()

        v = monitor.min_memory_available()
        self.assertIsInstance(v, long)

        v = monitor.max_memory_percent()
        self.assertIsInstance(v, float)

    def test_aggregate_io(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        # There's really no easy way to ensure I/O occurs. For all we know
        # reads and writes will all be serviced by the page cache.
        monitor.start()
        time.sleep(1.0)
        monitor.stop()

        values = monitor.aggregate_io()
        self.assertTrue(hasattr(values, 'read_count'))

    def _start_resource_monitoring(self, action, success=None):
        self.activate_virtualenv()

        # Resource Monitor requires Python 2.7, however it's currently optional.
        # Remove when all machines have had their Python version updated (bug 711299).
        if sys.version_info[:2] < (2, 7):
            self.warning("Resource monitoring will not be enabled! Python 2.7+ required.")
            return

        try:
            from mozsystemmonitor.resourcemonitor import SystemResourceMonitor

            self.info("Starting resource monitoring.")
            self._resource_monitor = SystemResourceMonitor(poll_interval=1.0)
            self._resource_monitor.start()
        except Exception:
            self.warning("Unable to start resource monitor: %s" % traceback.format_exc())

    def test_basic(self):
        monitor = SystemResourceMonitor(poll_interval=0.5)

        monitor.start()
        time.sleep(3)

        monitor.stop()

        data = list(monitor.range_usage())
        self.assertGreater(len(data), 3)

        self.assertIsInstance(data[0], SystemResourceUsage)

    def init(self, warnings_path):
        """Create a new monitor.

        warnings_path is a path of a warnings database to use.
        """
        self._warnings_path = warnings_path
        self.resources = SystemResourceMonitor(poll_interval=1.0)
        self._resources_started = False

        self.tiers = TierStatus(self.resources)

        self.warnings_database = WarningsDatabase()
        if os.path.exists(warnings_path):
            try:
                self.warnings_database.load_from_file(warnings_path)
            except ValueError:
                os.remove(warnings_path)

        self._warnings_collector = WarningsCollector(database=self.warnings_database, objdir=self.topobjdir)

    def init(self, warnings_path):
        """Create a new monitor.

        warnings_path is a path of a warnings database to use.
        """
        self._warnings_path = warnings_path
        self.resources = SystemResourceMonitor(poll_interval=1.0)
        self._resources_started = False

        self.tiers = TierStatus(self.resources)

        self.warnings_database = WarningsDatabase()
        if os.path.exists(warnings_path):
            try:
                self.warnings_database.load_from_file(warnings_path)
            except ValueError:
                os.remove(warnings_path)

        # Contains warnings unique to this invocation. Not populated with old
        # warnings.
        self.instance_warnings = WarningsDatabase()

        def on_warning(warning):
            filename = warning['filename']

            if not os.path.exists(filename):
                raise Exception('Could not find file containing warning: %s' %
                                filename)

            self.warnings_database.insert(warning)
            # Make a copy so mutations don't impact other database.
            self.instance_warnings.insert(warning.copy())

        self._warnings_collector = WarningsCollector(on_warning,
                                                     objdir=self.topobjdir)

        self.build_objects = []

class ResourceMonitoringMixin(object):
    """Provides resource monitoring capabilities to scripts.

    When this class is in the inheritance chain, resource usage stats of the
    executing script will be recorded.

    This class requires the VirtualenvMixin in order to install a package used
    for recording resource usage.

    While we would like to record resource usage for the entirety of a script,
    since we require an external package, we can only record resource usage
    after that package is installed (as part of creating the virtualenv).
    That's just the way things have to be.
    """
    def __init__(self, *args, **kwargs):
        super(ResourceMonitoringMixin, self).__init__(*args, **kwargs)

        self.register_virtualenv_module('psutil>=0.7.1', method='pip',
                                        optional=True)
        self.register_virtualenv_module('mozsystemmonitor==0.0.0',
                                        method='pip', optional=True)
        self._resource_monitor = None

    @PostScriptAction('create-virtualenv')
    def _start_resource_monitoring(self, action, success=None):
        self.activate_virtualenv()

        # Resource Monitor requires Python 2.7, however it's currently optional.
        # Remove when all machines have had their Python version updated (bug 711299).
        if sys.version_info[:2] < (2, 7):
            self.warning('Resource monitoring will not be enabled! Python 2.7+ required.')
            return

        try:
            from mozsystemmonitor.resourcemonitor import SystemResourceMonitor

            self.info("Starting resource monitoring.")
            self._resource_monitor = SystemResourceMonitor(poll_interval=1.0)
            self._resource_monitor.start()
        except Exception:
            self.warning("Unable to start resource monitor: %s" %
                         traceback.format_exc())

    @PreScriptAction
    def _resource_record_pre_action(self, action):
        # Resource monitor isn't available until after create-virtualenv.
        if not self._resource_monitor:
            return

        self._resource_monitor.begin_phase(action)

    @PostScriptAction
    def _resource_record_post_action(self, action, success=None):
        # Resource monitor isn't available until after create-virtualenv.
        if not self._resource_monitor:
            return

        self._resource_monitor.finish_phase(action)

    @PostScriptRun
    def _resource_record_post_run(self):
        if not self._resource_monitor:
            return

        # This should never raise an exception. This is a workaround until
        # mozsystemmonitor is fixed. See bug 895388.
        try:
            self._resource_monitor.stop()
            self._log_resource_usage()
        except Exception:
            self.warning("Exception when reporting resource usage: %s" %
                         traceback.format_exc())

    def _log_resource_usage(self):
        rm = self._resource_monitor

        if rm.start_time is None:
            return

        def resources(phase):
            cpu_percent = rm.aggregate_cpu_percent(phase=phase, per_cpu=False)
            cpu_times = rm.aggregate_cpu_times(phase=phase, per_cpu=False)
            io = rm.aggregate_io(phase=phase)

            return cpu_percent, cpu_times, io

        def log_usage(prefix, duration, cpu_percent, cpu_times, io):
            message = '{prefix} - Wall time: {duration:.0f}s; ' \
                'CPU: {cpu_percent}; ' \
                'Read bytes: {io_read_bytes}; Write bytes: {io_write_bytes}; ' \
                'Read time: {io_read_time}; Write time: {io_write_time}'

            # XXX Some test harnesses are complaining about a string being
            # being fed into a 'f' formatter. This will help diagnose the
            # issue.
            cpu_percent_str = str(round(cpu_percent)) + '%' if cpu_percent else "Can't collect data"

            try:
                self.info(
                    message.format(
#.........这里部分代码省略.........

class ResourceMonitoringMixin(object):
    """Provides resource monitoring capabilities to scripts.

    When this class is in the inheritance chain, resource usage stats of the
    executing script will be recorded.

    This class requires the VirtualenvMixin in order to install a package used
    for recording resource usage.

    While we would like to record resource usage for the entirety of a script,
    since we require an external package, we can only record resource usage
    after that package is installed (as part of creating the virtualenv).
    That's just the way things have to be.
    """
    def __init__(self, *args, **kwargs):
        super(ResourceMonitoringMixin, self).__init__(*args, **kwargs)

        self.register_virtualenv_module('psutil>=3.1.1', method='pip',
                                        optional=True)
        self.register_virtualenv_module('mozsystemmonitor==0.3',
                                        method='pip', optional=True)
        self._resource_monitor = None

    @PostScriptAction('create-virtualenv')
    def _start_resource_monitoring(self, action, success=None):
        self.activate_virtualenv()

        # Resource Monitor requires Python 2.7, however it's currently optional.
        # Remove when all machines have had their Python version updated (bug 711299).
        if sys.version_info[:2] < (2, 7):
            self.warning('Resource monitoring will not be enabled! Python 2.7+ required.')
            return

        try:
            from mozsystemmonitor.resourcemonitor import SystemResourceMonitor

            self.info("Starting resource monitoring.")
            self._resource_monitor = SystemResourceMonitor(poll_interval=1.0)
            self._resource_monitor.start()
        except Exception:
            self.warning("Unable to start resource monitor: %s" %
                         traceback.format_exc())

    @PreScriptAction
    def _resource_record_pre_action(self, action):
        # Resource monitor isn't available until after create-virtualenv.
        if not self._resource_monitor:
            return

        self._resource_monitor.begin_phase(action)

    @PostScriptAction
    def _resource_record_post_action(self, action, success=None):
        # Resource monitor isn't available until after create-virtualenv.
        if not self._resource_monitor:
            return

        self._resource_monitor.finish_phase(action)

    @PostScriptRun
    def _resource_record_post_run(self):
        if not self._resource_monitor:
            return

        # This should never raise an exception. This is a workaround until
        # mozsystemmonitor is fixed. See bug 895388.
        try:
            self._resource_monitor.stop()
            self._log_resource_usage()

            # Upload a JSON file containing the raw resource data.
            try:
                upload_dir = self.query_abs_dirs()['abs_blob_upload_dir']
                with open(os.path.join(upload_dir, 'resource-usage.json'), 'wb') as fh:
                    json.dump(self._resource_monitor.as_dict(), fh,
                              sort_keys=True, indent=4)
            except (AttributeError, KeyError):
                self.exception('could not upload resource usage JSON',
                               level=WARNING)

        except Exception:
            self.warning("Exception when reporting resource usage: %s" %
                         traceback.format_exc())

    def _log_resource_usage(self):
        rm = self._resource_monitor

        if rm.start_time is None:
            return

        def resources(phase):
            cpu_percent = rm.aggregate_cpu_percent(phase=phase, per_cpu=False)
            cpu_times = rm.aggregate_cpu_times(phase=phase, per_cpu=False)
            io = rm.aggregate_io(phase=phase)

            swap_in = sum(m.swap.sin for m in rm.measurements)
            swap_out = sum(m.swap.sout for m in rm.measurements)

            return cpu_percent, cpu_times, io, (swap_in, swap_out)

#.........这里部分代码省略.........

    def test_no_data(self):
        monitor = SystemResourceMonitor()

        data = list(monitor.range_usage())
        self.assertEqual(len(data), 0)

    def test_as_dict(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        monitor.start()
        time.sleep(0.1)
        monitor.begin_phase('phase1')
        monitor.record_event('foo')
        time.sleep(0.1)
        monitor.begin_phase('phase2')
        monitor.record_event('bar')
        time.sleep(0.2)
        monitor.finish_phase('phase1')
        time.sleep(0.2)
        monitor.finish_phase('phase2')
        time.sleep(0.4)
        monitor.stop()

        d = monitor.as_dict()

        self.assertEqual(d['version'], 2)
        self.assertEqual(len(d['events']), 2)
        self.assertEqual(len(d['phases']), 2)
        self.assertIn('system', d)
        self.assertIsInstance(d['system'], dict)
        self.assertIsInstance(d['overall'], dict)
        self.assertIn('duration', d['overall'])
        self.assertIn('cpu_times', d['overall'])

class ResourceMonitoringMixin(PerfherderResourceOptionsMixin):
    """Provides resource monitoring capabilities to scripts.

    When this class is in the inheritance chain, resource usage stats of the
    executing script will be recorded.

    This class requires the VirtualenvMixin in order to install a package used
    for recording resource usage.

    While we would like to record resource usage for the entirety of a script,
    since we require an external package, we can only record resource usage
    after that package is installed (as part of creating the virtualenv).
    That's just the way things have to be.
    """
    def __init__(self, *args, **kwargs):
        super(ResourceMonitoringMixin, self).__init__(*args, **kwargs)

        self.register_virtualenv_module('psutil>=3.1.1', method='pip',
                                        optional=True)
        self.register_virtualenv_module('mozsystemmonitor==0.3',
                                        method='pip', optional=True)
        self.register_virtualenv_module('jsonschema==2.5.1',
                                        method='pip')
        # explicitly install functools32, because some slaves aren't using
        # a version of pip recent enough to install it automatically with
        # jsonschema (which depends on it)
        # https://github.com/Julian/jsonschema/issues/233
        self.register_virtualenv_module('functools32==3.2.3-2',
                                        method='pip')
        self._resource_monitor = None

        # 2-tuple of (name, options) to assign Perfherder resource monitor
        # metrics to. This needs to be assigned by a script in order for
        # Perfherder metrics to be reported.
        self.resource_monitor_perfherder_id = None

    @PostScriptAction('create-virtualenv')
    def _start_resource_monitoring(self, action, success=None):
        self.activate_virtualenv()

        # Resource Monitor requires Python 2.7, however it's currently optional.
        # Remove when all machines have had their Python version updated (bug 711299).
        if sys.version_info[:2] < (2, 7):
            self.warning('Resource monitoring will not be enabled! Python 2.7+ required.')
            return

        try:
            from mozsystemmonitor.resourcemonitor import SystemResourceMonitor

            self.info("Starting resource monitoring.")
            self._resource_monitor = SystemResourceMonitor(poll_interval=1.0)
            self._resource_monitor.start()
        except Exception:
            self.warning("Unable to start resource monitor: %s" %
                         traceback.format_exc())

    @PreScriptAction
    def _resource_record_pre_action(self, action):
        # Resource monitor isn't available until after create-virtualenv.
        if not self._resource_monitor:
            return

        self._resource_monitor.begin_phase(action)

    @PostScriptAction
    def _resource_record_post_action(self, action, success=None):
        # Resource monitor isn't available until after create-virtualenv.
        if not self._resource_monitor:
            return

        self._resource_monitor.finish_phase(action)

    @PostScriptRun
    def _resource_record_post_run(self):
        if not self._resource_monitor:
            return

        # This should never raise an exception. This is a workaround until
        # mozsystemmonitor is fixed. See bug 895388.
        try:
            self._resource_monitor.stop()
            self._log_resource_usage()

            # Upload a JSON file containing the raw resource data.
            try:
                upload_dir = self.query_abs_dirs()['abs_blob_upload_dir']
                if not os.path.exists(upload_dir):
                    os.makedirs(upload_dir)
                with open(os.path.join(upload_dir, 'resource-usage.json'), 'wb') as fh:
                    json.dump(self._resource_monitor.as_dict(), fh,
                              sort_keys=True, indent=4)
            except (AttributeError, KeyError):
                self.exception('could not upload resource usage JSON',
                               level=WARNING)

        except Exception:
            self.warning("Exception when reporting resource usage: %s" %
                         traceback.format_exc())

    def _log_resource_usage(self):
#.........这里部分代码省略.........

class BuildMonitor(MozbuildObject):
    """Monitors the output of the build."""

    def init(self, warnings_path):
        """Create a new monitor.

        warnings_path is a path of a warnings database to use.
        """
        self._warnings_path = warnings_path
        self.resources = SystemResourceMonitor(poll_interval=1.0)
        self._resources_started = False

        self.tiers = TierStatus(self.resources)

        self.warnings_database = WarningsDatabase()
        if os.path.exists(warnings_path):
            try:
                self.warnings_database.load_from_file(warnings_path)
            except ValueError:
                os.remove(warnings_path)

        self._warnings_collector = WarningsCollector(database=self.warnings_database, objdir=self.topobjdir)

        self.build_objects = []

    def start(self):
        """Record the start of the build."""
        self.start_time = time.time()
        self._finder_start_cpu = self._get_finder_cpu_usage()

    def start_resource_recording(self):
        # This should be merged into start() once bug 892342 lands.
        self.resources.start()
        self._resources_started = True

    def on_line(self, line):
        """Consume a line of output from the build system.

        This will parse the line for state and determine whether more action is
        needed.

        Returns a BuildOutputResult instance.

        In this named tuple, warning will be an object describing a new parsed
        warning. Otherwise it will be None.

        state_changed indicates whether the build system changed state with
        this line. If the build system changed state, the caller may want to
        query this instance for the current state in order to update UI, etc.

        for_display is a boolean indicating whether the line is relevant to the
        user. This is typically used to filter whether the line should be
        presented to the user.
        """
        if line.startswith("BUILDSTATUS"):
            args = line.split()[1:]

            action = args.pop(0)
            update_needed = True

            if action == "TIERS":
                self.tiers.set_tiers(args)
                update_needed = False
            elif action == "TIER_START":
                tier = args[0]
                self.tiers.begin_tier(tier)
            elif action == "TIER_FINISH":
                tier, = args
                self.tiers.finish_tier(tier)
            elif action == "OBJECT_FILE":
                self.build_objects.append(args[0])
                update_needed = False
            else:
                raise Exception("Unknown build status: %s" % action)

            return BuildOutputResult(None, update_needed, False)

        warning = None

        try:
            warning = self._warnings_collector.process_line(line)
        except:
            pass

        return BuildOutputResult(warning, False, True)

    def stop_resource_recording(self):
        if self._resources_started:
            self.resources.stop()

        self._resources_started = False

    def finish(self, record_usage=True):
        """Record the end of the build."""
        self.stop_resource_recording()
        self.end_time = time.time()
        self._finder_end_cpu = self._get_finder_cpu_usage()
        self.elapsed = self.end_time - self.start_time

        self.warnings_database.prune()
#.........这里部分代码省略.........

class BuildMonitor(MozbuildObject):
    """Monitors the output of the build."""

    def init(self, warnings_path):
        """Create a new monitor.

        warnings_path is a path of a warnings database to use.
        """
        self._warnings_path = warnings_path
        self.resources = SystemResourceMonitor(poll_interval=1.0)
        self._resources_started = False

        self.tiers = TierStatus(self.resources)

        self.warnings_database = WarningsDatabase()
        if os.path.exists(warnings_path):
            try:
                self.warnings_database.load_from_file(warnings_path)
            except ValueError:
                os.remove(warnings_path)

        self._warnings_collector = WarningsCollector(
            database=self.warnings_database, objdir=self.topobjdir)

    def start(self):
        """Record the start of the build."""
        self.start_time = time.time()
        self._finder_start_cpu = self._get_finder_cpu_usage()

    def start_resource_recording(self):
        # This should be merged into start() once bug 892342 lands.
        self.resources.start()
        self._resources_started = True

    def on_line(self, line):
        """Consume a line of output from the build system.

        This will parse the line for state and determine whether more action is
        needed.

        Returns a BuildOutputResult instance.

        In this named tuple, warning will be an object describing a new parsed
        warning. Otherwise it will be None.

        state_changed indicates whether the build system changed state with
        this line. If the build system changed state, the caller may want to
        query this instance for the current state in order to update UI, etc.

        for_display is a boolean indicating whether the line is relevant to the
        user. This is typically used to filter whether the line should be
        presented to the user.
        """
        if line.startswith('BUILDSTATUS'):
            args = line.split()[1:]

            action = args.pop(0)
            update_needed = True

            if action == 'TIERS':
                self.tiers.set_tiers(args)
                update_needed = False
            elif action == 'TIER_START':
                tier = args[0]
                self.tiers.begin_tier(tier)
            elif action == 'TIER_FINISH':
                tier, = args
                self.tiers.finish_tier(tier)
            else:
                raise Exception('Unknown build status: %s' % action)

            return BuildOutputResult(None, update_needed, False)

        warning = None

        try:
            warning = self._warnings_collector.process_line(line)
        except:
            pass

        return BuildOutputResult(warning, False, True)

    def finish(self, record_usage=True):
        """Record the end of the build."""
        self.end_time = time.time()

        if self._resources_started:
            self.resources.stop()

        self._finder_end_cpu = self._get_finder_cpu_usage()
        self.elapsed = self.end_time - self.start_time

        self.warnings_database.prune()
        self.warnings_database.save_to_file(self._warnings_path)

        if not record_usage:
            return

        try:
            usage = self.record_resource_usage()
#.........这里部分代码省略.........

    def test_as_dict(self):
        monitor = SystemResourceMonitor(poll_interval=0.25)

        monitor.start()
        time.sleep(0.1)
        monitor.begin_phase('phase1')
        monitor.record_event('foo')
        time.sleep(0.1)
        monitor.begin_phase('phase2')
        monitor.record_event('bar')
        time.sleep(0.2)
        monitor.finish_phase('phase1')
        time.sleep(0.2)
        monitor.finish_phase('phase2')
        time.sleep(0.4)
        monitor.stop()

        d = monitor.as_dict()

        self.assertEqual(d['version'], 1)
        self.assertEqual(len(d['events']), 2)
        self.assertEqual(len(d['phases']), 2)