Is Redis thread safe?
Category:
technology and computing
databases
Enter the Redis GIL
Luckily, Salvatore Sanfilippo has added a revolutionary change just near the finish line of Redis 4.0 and the release of the modules API : Thread Safe Contexts and the Global Lock. The idea is simple. While Redis still remains single threaded, a module can run many threads.
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.
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.
To summarize:
- 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.