def register_cache(
cache_type: str,
cache_name: str,
cache,
collect_callback: Optional[Callable] = None,
resizable: bool = True,
resize_callback: Optional[Callable] = None,
) -> CacheMetric:
"""Register a cache object for metric collection and resizing.
Args:
cache_type
cache_name: name of the cache
cache: cache itself
collect_callback: If given, a function which is called during metric
collection to update additional metrics.
resizable: Whether this cache supports being resized.
resize_callback: A function which can be called to resize the cache.
Returns:
CacheMetric: an object which provides inc_{hits,misses,evictions} methods
"""
if resizable:
if not resize_callback:
resize_callback = getattr(cache, "set_cache_factor")
add_resizable_cache(cache_name, resize_callback)
metric = CacheMetric(cache, cache_type, cache_name, collect_callback)
metric_name = "cache_%s_%s" % (cache_type, cache_name)
caches_by_name[cache_name] = cache
collectors_by_name[metric_name] = metric
return metric
def register_cache(
cache_type: str,
cache_name: str,
cache: Sized,
collect_callback: Optional[Callable] = None,
resizable: bool = True,
resize_callback: Optional[Callable] = None,
) -> CacheMetric:
"""Register a cache object for metric collection and resizing.
Args:
cache_type: a string indicating the "type" of the cache. This is used
only for deduplication so isn't too important provided it's constant.
cache_name: name of the cache
cache: cache itself, which must implement __len__(), and may optionally implement
a max_size property
collect_callback: If given, a function which is called during metric
collection to update additional metrics.
resizable: Whether this cache supports being resized, in which case either
resize_callback must be provided, or the cache must support set_max_size().
resize_callback: A function which can be called to resize the cache.
Returns:
CacheMetric: an object which provides inc_{hits,misses,evictions} methods
"""
if resizable:
if not resize_callback:
resize_callback = cache.set_cache_factor # type: ignore
add_resizable_cache(cache_name, resize_callback)
metric = CacheMetric(cache, cache_type, cache_name, collect_callback)
metric_name = "cache_%s_%s" % (cache_type, cache_name)
caches_by_name[cache_name] = cache
collectors_by_name[metric_name] = metric
return metric
def test_individual_instantiated_after_config_load(self):
"""
If a cache is instantiated after the config is read, it will be
immediately resized to the correct size given the per_cache_factor if
there is one.
"""
config = {"caches": {"per_cache_factors": {"foo": 2}}}
self.config.read_config(config, config_dir_path="", data_dir_path="")
self.config.resize_all_caches()
cache = LruCache(100)
add_resizable_cache("foo", cache_resize_callback=cache.set_cache_factor)
self.assertEqual(cache.max_size, 200)
def test_global_instantiated_after_config_load(self):
"""
If a cache is instantiated after the config is read, it will be
immediately resized to the correct size given the global factor if there
is no per-cache factor.
"""
config = {"caches": {"global_factor": 1.5}}
t = TestConfig()
t.read_config(config, config_dir_path="", data_dir_path="")
cache = LruCache(100)
add_resizable_cache("foo", cache_resize_callback=cache.set_cache_factor)
self.assertEqual(cache.max_size, 150)
def test_global_instantiated_before_config_load(self):
"""
If a cache is instantiated before the config is read, it will be given
the default cache size in the interim, and then resized to the new
default cache size once the config is loaded.
"""
cache = LruCache(100)
add_resizable_cache("foo", cache_resize_callback=cache.set_cache_factor)
self.assertEqual(cache.max_size, 50)
config = {"caches": {"global_factor": 4}}
self.config.read_config(config, config_dir_path="", data_dir_path="")
self.config.resize_all_caches()
self.assertEqual(cache.max_size, 400)
def test_apply_cache_factor_from_config(self):
"""Caches can disable applying cache factor updates, mainly used by
event cache size.
"""
config = {"caches": {"event_cache_size": "10k"}}
t = TestConfig()
t.read_config(config, config_dir_path="", data_dir_path="")
cache = LruCache(
max_size=t.caches.event_cache_size, apply_cache_factor_from_config=False,
)
add_resizable_cache("event_cache", cache_resize_callback=cache.set_cache_factor)
self.assertEqual(cache.max_size, 10240)
def test_individual_instantiated_before_config_load(self):
"""
If a cache is instantiated before the config is read, it will be given
the default cache size in the interim, and then resized once the config
is loaded.
"""
cache = LruCache(100)
add_resizable_cache("foo", cache_resize_callback=cache.set_cache_factor)
self.assertEqual(cache.max_size, 50)
config = {"caches": {"per_cache_factors": {"foo": 3}}}
self.config.read_config(config)
self.config.resize_all_caches()
self.assertEqual(cache.max_size, 300)
def test_cache_with_asterisk_in_name(self):
"""Some caches have asterisks in their name, test that they are set correctly."""
config = {
"caches": {
"per_cache_factors": {"*cache_a*": 5, "cache_b": 6, "cache_c": 2}
}
}
self.config._environ = {
"SYNAPSE_CACHE_FACTOR_CACHE_A": "2",
"SYNAPSE_CACHE_FACTOR_CACHE_B": 3,
}
self.config.read_config(config, config_dir_path="", data_dir_path="")
self.config.resize_all_caches()
cache_a = LruCache(100)
add_resizable_cache("*cache_a*", cache_resize_callback=cache_a.set_cache_factor)
self.assertEqual(cache_a.max_size, 200)
cache_b = LruCache(100)
add_resizable_cache("*Cache_b*", cache_resize_callback=cache_b.set_cache_factor)
self.assertEqual(cache_b.max_size, 300)
cache_c = LruCache(100)
add_resizable_cache("*cache_c*", cache_resize_callback=cache_c.set_cache_factor)
self.assertEqual(cache_c.max_size, 200)
