Add metrics for psutil derived memory usage
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@ -51,6 +51,7 @@ from synapse.api.urls import (
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from synapse.config.homeserver import HomeServerConfig
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from synapse.crypto import context_factory
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from synapse.util.logcontext import LoggingContext
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from synapse.metrics import register_memory_metrics
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from synapse.metrics.resource import MetricsResource, METRICS_PREFIX
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from synapse.replication.resource import ReplicationResource, REPLICATION_PREFIX
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from synapse.federation.transport.server import TransportLayerServer
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@ -335,6 +336,8 @@ def setup(config_options):
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hs.get_datastore().start_doing_background_updates()
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hs.get_replication_layer().start_get_pdu_cache()
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register_memory_metrics(hs)
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reactor.callWhenRunning(start)
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return hs
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@ -27,7 +27,8 @@ import gc
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from twisted.internet import reactor
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from .metric import (
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CounterMetric, CallbackMetric, DistributionMetric, CacheMetric
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CounterMetric, CallbackMetric, DistributionMetric, CacheMetric,
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MemoryUsageMetric,
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)
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@ -66,6 +67,12 @@ class Metrics(object):
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return self._register(CacheMetric, *args, **kwargs)
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def register_memory_metrics(hs):
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metric = MemoryUsageMetric(hs)
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all_metrics.append(metric)
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return metric
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def get_metrics_for(pkg_name):
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""" Returns a Metrics instance for conveniently creating metrics
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namespaced with the given name prefix. """
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@ -16,6 +16,8 @@
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from itertools import chain
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import psutil
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# TODO(paul): I can't believe Python doesn't have one of these
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def map_concat(func, items):
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@ -153,3 +155,39 @@ class CacheMetric(object):
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"""%s:total{name="%s"} %d""" % (self.name, self.cache_name, total),
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"""%s:size{name="%s"} %d""" % (self.name, self.cache_name, size),
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]
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class MemoryUsageMetric(object):
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"""Keeps track of the current memory usage, using psutil.
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The class will keep the current min/max/sum/counts of rss over the last
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WINDOW_SIZE_SEC, by polling UPDATE_HZ times per second
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"""
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UPDATE_HZ = 2 # number of times to get memory per second
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WINDOW_SIZE_SEC = 30 # the size of the window in seconds
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def __init__(self, hs):
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clock = hs.get_clock()
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self.memory_snapshots = []
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self.process = psutil.Process()
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clock.looping_call(self._update_curr_values, 1000 / self.UPDATE_HZ)
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def _update_curr_values(self):
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max_size = self.UPDATE_HZ * self.WINDOW_SIZE_SEC
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self.memory_snapshots.append(self.process.memory_info().rss)
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self.memory_snapshots[:] = self.memory_snapshots[-max_size:]
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def render(self):
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max_rss = max(self.memory_snapshots)
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min_rss = min(self.memory_snapshots)
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sum_rss = sum(self.memory_snapshots)
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len_rss = len(self.memory_snapshots)
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return [
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"process_psutil_rss:max %d" % max_rss,
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"process_psutil_rss:min %d" % min_rss,
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"process_psutil_rss:total %d" % sum_rss,
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"process_psutil_rss:count %d" % len_rss,
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]
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@ -36,6 +36,7 @@ REQUIREMENTS = {
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"blist": ["blist"],
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"pysaml2>=3.0.0,<4.0.0": ["saml2>=3.0.0,<4.0.0"],
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"pymacaroons-pynacl": ["pymacaroons"],
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"psutil>=2.0.0": ["psutil>=2.0.0"],
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}
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CONDITIONAL_REQUIREMENTS = {
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"web_client": {
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