diff options
Diffstat (limited to 'synapse/config/cache.py')
| -rw-r--r-- | synapse/config/cache.py | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/synapse/config/cache.py b/synapse/config/cache.py index 58b2fe5519..d2f55534d7 100644 --- a/synapse/config/cache.py +++ b/synapse/config/cache.py @@ -176,6 +176,24 @@ class CacheConfig(Config): # #cache_entry_ttl: 30m + # This flag enables cache autotuning, and is further specified by the sub-options `max_cache_memory_usage`, + # `target_cache_memory_usage`, `min_cache_ttl`. These flags work in conjunction with each other to maintain + # a balance between cache memory usage and cache entry availability. You must be using jemalloc to utilize + # this option, and all three of the options must be specified for this feature to work. + #cache_autotuning: + # This flag sets a ceiling on much memory the cache can use before caches begin to be continuously evicted. + # They will continue to be evicted until the memory usage drops below the `target_memory_usage`, set in + # the flag below, or until the `min_cache_ttl` is hit. + #max_cache_memory_usage: 1024M + + # This flag sets a rough target for the desired memory usage of the caches. + #target_cache_memory_usage: 758M + + # 'min_cache_ttl` sets a limit under which newer cache entries are not evicted and is only applied when + # caches are actively being evicted/`max_cache_memory_usage` has been exceeded. This is to protect hot caches + # from being emptied while Synapse is evicting due to memory. + #min_cache_ttl: 5m + # Controls how long the results of a /sync request are cached for after # a successful response is returned. A higher duration can help clients with # intermittent connections, at the cost of higher memory usage. @@ -263,6 +281,21 @@ class CacheConfig(Config): ) self.expiry_time_msec = self.parse_duration(expiry_time) + self.cache_autotuning = cache_config.get("cache_autotuning") + if self.cache_autotuning: + max_memory_usage = self.cache_autotuning.get("max_cache_memory_usage") + self.cache_autotuning["max_cache_memory_usage"] = self.parse_size( + max_memory_usage + ) + + target_mem_size = self.cache_autotuning.get("target_cache_memory_usage") + self.cache_autotuning["target_cache_memory_usage"] = self.parse_size( + target_mem_size + ) + + min_cache_ttl = self.cache_autotuning.get("min_cache_ttl") + self.cache_autotuning["min_cache_ttl"] = self.parse_duration(min_cache_ttl) + self.sync_response_cache_duration = self.parse_duration( cache_config.get("sync_response_cache_duration", 0) ) |