diff options
Diffstat (limited to 'synapse/util')
| -rw-r--r-- | synapse/util/caches/__init__.py | 31 | ||||
| -rw-r--r-- | synapse/util/caches/lrucache.py | 48 |
2 files changed, 78 insertions, 1 deletions
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py index 46af7fa473..ca36f07c20 100644 --- a/synapse/util/caches/__init__.py +++ b/synapse/util/caches/__init__.py @@ -24,6 +24,11 @@ from synapse.config.cache import add_resizable_cache logger = logging.getLogger(__name__) + +# Whether to track estimated memory usage of the LruCaches. +TRACK_MEMORY_USAGE = False + + caches_by_name = {} # type: Dict[str, Sized] collectors_by_name = {} # type: Dict[str, CacheMetric] @@ -32,6 +37,11 @@ cache_hits = Gauge("synapse_util_caches_cache:hits", "", ["name"]) cache_evicted = Gauge("synapse_util_caches_cache:evicted_size", "", ["name"]) cache_total = Gauge("synapse_util_caches_cache:total", "", ["name"]) cache_max_size = Gauge("synapse_util_caches_cache_max_size", "", ["name"]) +cache_memory_usage = Gauge( + "synapse_util_caches_cache_size_bytes", + "Estimated memory usage of the caches", + ["name"], +) response_cache_size = Gauge("synapse_util_caches_response_cache:size", "", ["name"]) response_cache_hits = Gauge("synapse_util_caches_response_cache:hits", "", ["name"]) @@ -52,6 +62,7 @@ class CacheMetric: hits = attr.ib(default=0) misses = attr.ib(default=0) evicted_size = attr.ib(default=0) + memory_usage = attr.ib(default=None) def inc_hits(self): self.hits += 1 @@ -62,6 +73,19 @@ class CacheMetric: def inc_evictions(self, size=1): self.evicted_size += size + def inc_memory_usage(self, memory: int): + if self.memory_usage is None: + self.memory_usage = 0 + + self.memory_usage += memory + + def dec_memory_usage(self, memory: int): + self.memory_usage -= memory + + def clear_memory_usage(self): + if self.memory_usage is not None: + self.memory_usage = 0 + def describe(self): return [] @@ -81,6 +105,13 @@ class CacheMetric: cache_total.labels(self._cache_name).set(self.hits + self.misses) if getattr(self._cache, "max_size", None): cache_max_size.labels(self._cache_name).set(self._cache.max_size) + + if TRACK_MEMORY_USAGE: + # self.memory_usage can be None if nothing has been inserted + # into the cache yet. + cache_memory_usage.labels(self._cache_name).set( + self.memory_usage or 0 + ) if self._collect_callback: self._collect_callback() except Exception as e: diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py index 10b0ec6b75..1be675e014 100644 --- a/synapse/util/caches/lrucache.py +++ b/synapse/util/caches/lrucache.py @@ -32,9 +32,36 @@ from typing import ( from typing_extensions import Literal from synapse.config import cache as cache_config +from synapse.util import caches from synapse.util.caches import CacheMetric, register_cache from synapse.util.caches.treecache import TreeCache +try: + from pympler.asizeof import Asizer + + def _get_size_of(val: Any, *, recurse=True) -> int: + """Get an estimate of the size in bytes of the object. + + Args: + val: The object to size. + recurse: If true will include referenced values in the size, + otherwise only sizes the given object. + """ + # Ignore singleton values when calculating memory usage. + if val in ((), None, ""): + return 0 + + sizer = Asizer() + sizer.exclude_refs((), None, "") + return sizer.asizeof(val, limit=100 if recurse else 0) + + +except ImportError: + + def _get_size_of(val: Any, *, recurse=True) -> int: + return 0 + + # Function type: the type used for invalidation callbacks FT = TypeVar("FT", bound=Callable[..., Any]) @@ -56,7 +83,7 @@ def enumerate_leaves(node, depth): class _Node: - __slots__ = ["prev_node", "next_node", "key", "value", "callbacks"] + __slots__ = ["prev_node", "next_node", "key", "value", "callbacks", "memory"] def __init__( self, @@ -84,6 +111,16 @@ class _Node: self.add_callbacks(callbacks) + self.memory = 0 + if caches.TRACK_MEMORY_USAGE: + self.memory = ( + _get_size_of(key) + + _get_size_of(value) + + _get_size_of(self.callbacks, recurse=False) + + _get_size_of(self, recurse=False) + ) + self.memory += _get_size_of(self.memory, recurse=False) + def add_callbacks(self, callbacks: Collection[Callable[[], None]]) -> None: """Add to stored list of callbacks, removing duplicates.""" @@ -233,6 +270,9 @@ class LruCache(Generic[KT, VT]): if size_callback: cached_cache_len[0] += size_callback(node.value) + if caches.TRACK_MEMORY_USAGE and metrics: + metrics.inc_memory_usage(node.memory) + def move_node_to_front(node): prev_node = node.prev_node next_node = node.next_node @@ -258,6 +298,9 @@ class LruCache(Generic[KT, VT]): node.run_and_clear_callbacks() + if caches.TRACK_MEMORY_USAGE and metrics: + metrics.dec_memory_usage(node.memory) + return deleted_len @overload @@ -373,6 +416,9 @@ class LruCache(Generic[KT, VT]): if size_callback: cached_cache_len[0] = 0 + if caches.TRACK_MEMORY_USAGE and metrics: + metrics.clear_memory_usage() + @synchronized def cache_contains(key: KT) -> bool: return key in cache |