def _update_data(self):
# Don't allow to call this function so frequently (<= 1 sec)
now = timeutils.utcnow()
if self._data.get("timestamp") is not None:
delta = now - self._data.get("timestamp")
if delta.seconds <= 1:
return
self._data = {}
self._data["timestamp"] = now
# Extract node's CPU statistics.
try:
stats = self.driver.get_host_cpu_stats()
self._data["cpu.user.time"] = stats["user"]
self._data["cpu.kernel.time"] = stats["kernel"]
self._data["cpu.idle.time"] = stats["idle"]
self._data["cpu.iowait.time"] = stats["iowait"]
self._data["cpu.frequency"] = stats["frequency"]
except (NotImplementedError, TypeError, KeyError):
LOG.exception(
_LE("Not all properties needed are implemented "
"in the compute driver"))
raise exception.ResourceMonitorError(
monitor=self.__class__.__name__)
# The compute driver API returns the absolute values for CPU times.
# We compute the utilization percentages for each specific CPU time
# after calculating the delta between the current reading and the
# previous reading.
stats["total"] = (stats["user"] + stats["kernel"] + stats["idle"] +
stats["iowait"])
cputime = float(stats["total"] - self._cpu_stats.get("total", 0))
# NOTE(jwcroppe): Convert all the `perc` values to their integer forms
# since pre-conversion their values are within the range [0, 1] and the
# objects.MonitorMetric.value field requires an integer.
perc = (stats["user"] - self._cpu_stats.get("user", 0)) / cputime
self._data["cpu.user.percent"] = int(perc * 100)
perc = (stats["kernel"] - self._cpu_stats.get("kernel", 0)) / cputime
self._data["cpu.kernel.percent"] = int(perc * 100)
perc = (stats["idle"] - self._cpu_stats.get("idle", 0)) / cputime
self._data["cpu.idle.percent"] = int(perc * 100)
perc = (stats["iowait"] - self._cpu_stats.get("iowait", 0)) / cputime
self._data["cpu.iowait.percent"] = int(perc * 100)
# Compute the current system-wide CPU utilization as a percentage.
used = stats["user"] + stats["kernel"] + stats["iowait"]
prev_used = (self._cpu_stats.get("user", 0) +
self._cpu_stats.get("kernel", 0) +
self._cpu_stats.get("iowait", 0))
perc = (used - prev_used) / cputime
self._data["cpu.percent"] = int(perc * 100)
self._cpu_stats = stats.copy()
def _update_data(self, **kwargs):
# Don't allow to call this function so frequently (<= 1 sec)
now = timeutils.utcnow()
if self._data.get("timestamp") is not None:
delta = now - self._data.get("timestamp")
if delta.seconds <= 1:
return
self._data = {}
self._data["timestamp"] = now
# Extract node's CPU statistics.
try:
stats = self.driver.get_host_cpu_stats()
self._data["cpu.user.time"] = stats["user"]
self._data["cpu.kernel.time"] = stats["kernel"]
self._data["cpu.idle.time"] = stats["idle"]
self._data["cpu.iowait.time"] = stats["iowait"]
self._data["cpu.frequency"] = stats["frequency"]
except (NotImplementedError, TypeError, KeyError) as ex:
LOG.exception(
_("Not all properties needed are implemented "
"in the compute driver: %s"), ex)
raise exception.ResourceMonitorError(
monitor=self.__class__.__name__)
# The compute driver API returns the absolute values for CPU times.
# We compute the utilization percentages for each specific CPU time
# after calculating the delta between the current reading and the
# previous reading.
stats["total"] = (stats["user"] + stats["kernel"] + stats["idle"] +
stats["iowait"])
cputime = float(stats["total"] - self._cpu_stats.get("total", 0))
perc = (stats["user"] - self._cpu_stats.get("user", 0)) / cputime
self._data["cpu.user.percent"] = perc
perc = (stats["kernel"] - self._cpu_stats.get("kernel", 0)) / cputime
self._data["cpu.kernel.percent"] = perc
perc = (stats["idle"] - self._cpu_stats.get("idle", 0)) / cputime
self._data["cpu.idle.percent"] = perc
perc = (stats["iowait"] - self._cpu_stats.get("iowait", 0)) / cputime
self._data["cpu.iowait.percent"] = perc
# Compute the current system-wide CPU utilization as a percentage.
used = stats["user"] + stats["kernel"] + stats["iowait"]
prev_used = (self._cpu_stats.get("user", 0) +
self._cpu_stats.get("kernel", 0) +
self._cpu_stats.get("iowait", 0))
perc = (used - prev_used) / cputime
self._data["cpu.percent"] = perc
self._cpu_stats = stats.copy()
