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Sophia - Advanced transactional MVCC key-value/row storage library
Sophia is RAM-Disk hybrid storage. It is designed to provide best possible on-disk performance without degradation in time. It has guaranteed O(1) worst case complexity for read, write and range scan operations. It provides Full ACID compliancy, MVCC engine, Optimistic, non-blocking concurrency with N-writers and M-readers, Prefix search, Automatic key-expire, Implemented as small C-written library with zero dependencies and lot more.
cache key-value key-value-store database off-heapMapDB - Embedded Database Engine
MapDB is an embedded database engine. It provides Maps and other collections backed by disk or memory storage. It offers excellent performance comparable to java collections, but is not limited by GC overhead. It is also a full database engine with storage backends, transactions, cache algorithms, expiration and many other options. MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory.
embedded-database database java-collections off-heap cache in-memory key-value-storeDiskCache - Python disk backed cache (Django-compatible). Faster than Redis and Memcached. Pure-Python
DiskCache is a disk and file backed cache library, written in pure-Python, and compatible with Django. The cloud-based computing of 2021 puts a premium on memory. Gigabytes of empty space is left on disks as processes vie for memory. Among these processes is Memcached (and sometimes Redis) which is used as a cache. It is good to use empty disk space for caching.
cache caching off-heap key-value key-value-storeLArray - Large off-heap arrays for Java/Scala
A library for managing large off-heap arrays that can hold more than 2G (2^31) entries in Java and Scala. Notably LArray is disposable by calling LArray.free or you can let GC automatically release the memory. LArray also can be used to create an mmap (memory-mapped file) whose size is more than 2GB
array large-array mmap cache off-heap memory-mapped collections data-structureOHC - Java large off heap cache
Off-Heap concurrent hash map intended to store GBs of serialized data. It has optional per entry or default TTL/expireAt, Entry eviction and expiration without a separate thread, Capable of maintaining huge amounts of cache memory, Suitable for tiny/small entries with low overhead using the chunked implementation.
cache off-heap heap
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