def work(self):
"""
Long running loop that periodically dumps the stats.
"""
if profiler.is_running():
raise NovaServiceProfilingException("Profiling already enabled.")
# Set clock type
self.set_clock_type()
# Start profiler
profiler.start()
self._started = utils.utc_seconds()
last_dumped = time.time()
while not self.should_stop():
# Sleep for less than whole interval for faster interrupts
sleep(self._sub_interval)
checked = time.time()
# Only take action if we have exceeded the interval period
if (checked - last_dumped) > self._config.interval:
self._dump()
# Update last dumped
last_dumped = checked
# Finally stop the profiler
profiler.stop()
self._ended = utils.utc_seconds()
def _dump(self):
"""
Dumps the profiling stats.
Also manages clearing stats if clearing each interval.
"""
# If clearing each interval, stop profiler
if self._config.clear_each_interval:
profiler.stop()
self._ended = utils.utc_seconds()
# Dump the stats
stats = profiler.get_func_stats()
ctx = ProfilingContext(
started=self._started, ended=utils.utc_seconds(),
topic=self._topic
)
for o in self._outputs:
try:
o.write(ctx, stats)
except Exception:
# @TODO - Possibly do something with logging
pass
# If clearing each interval, clear stats and restart profiler
if self._config.clear_each_interval:
profiler.clear_stats()
profiler.start()
self.started = utils.utc_seconds()