Cache hit ratio is the ratio of cache hits to the total (miss+hit) accesses. Cache hit is the existence of a key in cache (and in RAM) for a quick accession.
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LRU means least recently used slow is evicted for fresh data. This article starts with simplest form of read-only cache and later adds write-cache capability and optimizations. Writing to backing-store is called "write-back". What are cache miss and cache hit and cache hit ratio? Cache miss is the operation of getting data from slow datastore and assigning it to a victim slot in the cache in both cache-read and cache-write operations. Having an asynchronous LRU on the other hand, should hide any latency of a cache-miss. So, having a LRU cache should improve performance by 2x - 100x depending on the slowest data store performance. In a web app, especially with NodeJS, the latency of an operation (if in a non-async function) decides when other clients will be served. Caching of file contents on RAM improves not only throughput but also latency. HDD is too slow ~100MB/s, SSD is still slow ~500MB/s, even NVME is slower (5GB/s) than the cheapest RAM module on the shelf. Without caching, the throughput depends on the slowest storage that the data comes from. The basic idea of caching is to serve some (computationally) expensive data from an already (precomputed) list of data. OSes (like Ubuntu) have their own file caching already but when there are multiple web apps running on same server and if one app is streaming a lot of video data, then other apps cache contents may be invalidated frequently and their performance drop.Ī dedicated Least Recently Used (cache eviction) algorithm for an app's resources make the app independent of the cache pollution from other applications in the same server. In server-side JavaScript (web apps), caching of files and video blobs and fast accession to page templates are vital.
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Game belongs to genres: Puzzle Games, Hidden Object Games Full version features: With eight unique mini-games, two bonus modes, back-to-back speed bonuses, and over 2,300 objects to track down, this will be a grand vacation to remember! Collect hidden Seashells to extend your tropical vacation by up to seven days and to unlock seven bonus locations. The best part about it? That you can take your time and enjoy all of the sights and sounds.Explore 28 beautiful Hawaiian locations to complete tours and fill your vacation journal with achievements. Here, you'll spend the days relaxing under the sun, and the nights listening to calm ocean waves washing ashore.
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Your first stop on a worldwide trip to the most amazing places on Earth awaits when you visit the Hawaiian Islands.