145e62b568
When running within k8s the system memory statistics are useless as soon there are configured limits (which is strongly advised). In this case we additionally need to check the cgroups. Change-Id: Idebe5d7e60dc862e89d012594ab362a19f18708d
100 lines
3.4 KiB
Python
100 lines
3.4 KiB
Python
# Copyright 2018 BMW Car IT GmbH
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import math
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import psutil
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from zuul.executor.sensors import SensorInterface
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from zuul.lib.config import get_default
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CGROUP_STATS_FILE = '/sys/fs/cgroup/memory/memory.stat'
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def get_avail_mem_pct():
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avail_mem_pct = 100.0 - psutil.virtual_memory().percent
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return avail_mem_pct
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class RAMSensor(SensorInterface):
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log = logging.getLogger("zuul.executor.sensor.ram")
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def __init__(self, config=None):
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self.min_avail_mem = float(get_default(config, 'executor',
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'min_avail_mem', '5.0'))
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self.cgroup_stats_file = CGROUP_STATS_FILE
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def _read_cgroup_stat(self):
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stat = {}
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try:
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with open(self.cgroup_stats_file) as f:
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for line in f.readlines():
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key, value = line.split(' ')
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stat[key] = int(value.strip())
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except Exception:
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pass
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return stat
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def _get_cgroup_limit(self):
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stat = self._read_cgroup_stat()
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limit = stat.get('hierarchical_memory_limit', math.inf)
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mem_total = psutil.virtual_memory().total
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if limit < mem_total:
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return limit
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else:
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return math.inf
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def _get_avail_mem_pct_cgroup(self):
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stat = self._read_cgroup_stat()
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limit = stat.get('hierarchical_memory_limit', math.inf)
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usage = stat.get('total_rss', math.inf)
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if math.isinf(limit) or math.isinf(usage):
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# pretend we have all memory available if we got infs
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return 100
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return 100.0 - usage / limit * 100
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def isOk(self):
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avail_mem_pct = get_avail_mem_pct()
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if avail_mem_pct < self.min_avail_mem:
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return False, "low memory {:3.1f}% < {}".format(
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avail_mem_pct, self.min_avail_mem)
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if math.isinf(self._get_cgroup_limit()):
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# we have no cgroup defined limit so we're done now
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return True, "{:3.1f}% <= {}".format(
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avail_mem_pct, self.min_avail_mem)
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avail_mem_pct_cgroup = self._get_avail_mem_pct_cgroup()
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if avail_mem_pct_cgroup < self.min_avail_mem:
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return False, "low memory cgroup {:3.1f}% < {}".format(
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avail_mem_pct_cgroup, self.min_avail_mem)
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return True, "{:3.1f}% <= {}, {:3.1f}% <= {}".format(
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avail_mem_pct, self.min_avail_mem,
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avail_mem_pct_cgroup, self.min_avail_mem)
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def reportStats(self, statsd, base_key):
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avail_mem_pct = get_avail_mem_pct()
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statsd.gauge(base_key + '.pct_used_ram',
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int((100.0 - avail_mem_pct) * 100))
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if math.isfinite(self._get_cgroup_limit()):
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avail_mem_pct_cgroup = self._get_avail_mem_pct_cgroup()
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statsd.gauge(base_key + '.pct_used_ram_cgroup',
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int((100.0 - avail_mem_pct_cgroup) * 100))
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