Is Redis thread safe?
Similarly, is Redis Cache thread safe?
Redis is single-threaded. As such all commands in Redis are atomic. However, depending on the implementation in the client library sharing a connection may still be problematic. For this reason, among others, your client access needs be be thread safe.
Also Know, is Redis concurrent? OK, Redis is single-threaded at user-level, OTOH, all asynchronous I/O is supported by kernel thread pools and/or split-level drivers. 'Concurrent', to some, includes distributing network events to socket state-machines.
In this regard, is Redis single threaded?
Redis is, mostly, a single-threaded server from the POV of commands execution (actually modern versions of Redis use threads for different things). It is not designed to benefit from multiple CPU cores. People are supposed to launch several Redis instances to scale out on several cores if needed.
How do I optimize Redis?
- Do set a maxmemory limit.
- Do use allkeys-lru policies for dedicated cache instances. Let Redis manage key eviction by itself.
- Do not set expire for keys, it adds additional memory overhead per key.
- Do tune the precision of the LRU algorithm to favor speed over accuracy.