Theine Go version is also available, which focus on concurrency performance, take a look if you are interested: Theine Go. Open an issue, ask question in discussions or join discord channel: Meta shared anonymized trace captured from large scale production cache services, from cachelib Support Scarabresearch 1 hour database trace from this issue Meta anonymized trace This trace is described as "a database server running at a commercial site running an ERP application on top of a commercial database." This trace is described as "disk read accesses initiated by a large commercial search engine in response to various web search requests." Write and Mix Zipf use 1k max cache size, so you can see the high cost of traditional LFU eviction policy here.Īll hit ratio benchmarks use small datasets and finish in seconds/minutes, better to try Theine yourself and focus on whether the cache exceeds your performance needs and has the desired capabilities. OS: Ubuntu 22.04.2 LTS continuous benchmark Soft and soothing, these rare TWG Tea chamomile flowers boast a rich honey aroma and yield a golden, theine-free cup. Clock-Pro will use 2x meta space, which is 184 megabytes. For 1 million keys, the total memory overhead is 92 megabytes. set( "key", ,Īssume your key is 24 bytes long, then each meta key entry in Rust is 92 bytes. # with default, return default on miss sentinel = object() # without default, return None on miss v = cache. Please be aware the Cache class is not thread-safe.įrom theine import Cache from datetime import timedelta # tlfu is the eviction policy, Theine provide 3 policies lru/tlfu/clockpro cache = Cache( "tlfu", 10000) Django adapter will create a global cache instance autmoatically, and when using the Memoize decorator, please make sure your cache instance is created globally, instead of creating a new one in each run. So don't create instance dynamically in your function. If key type is not str/int, Theine will generate a unique key string automatically, this unique str will use extra space in memory and increase get/set/remove overhead.Įach Cache instance will span a thread to evict expired entries proactively, and the overhead of cache instance init is relatively high. Key should be a Hashable object, and value can be any Python object. Theine uses an adaptive version of W-TinyLFU to get better hit ratio under different types of workloads.Īn improved CLOCK replacement policy(CLOCK: an approximation of LRU), based on P圜lockPro. Features Prevent your computer from falling asleep. W-TinyLFUĪn approximate LFU policy in order to boost the effectiveness of caches subject to skewed access distributions. While Theine runs, your PC will not go to sleep, nor will it go into hibernation mode. Theine provides 3 built in cache eviction policies: LRUĭiscards the least recently used items first. Soft and soothing, these rare TWG Tea chamomile flowers boast a rich honey aroma and yield a golden, theine-free cup.
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