Question: How fast is Redis?

Answer

Redis is known for its speed and high performance. It is an in-memory data structure store that can perform millions of operations per second. Redis achieves this by using an optimized, single-threaded architecture and by keeping all data in memory.

Here are some benchmarks that demonstrate Redis's speed:

1. Redis can do around 110,000 SETs per second on a entry-level laptop.

127.0.0.1:6379> benchmark set 100000 
  SET: 108695.65 requests per second

1. Redis can handle up to 1 million SETs per second on a powerful server.

127.0.0.1:6379> benchmark set 10000000
  SET: 1000000.00 requests per second

1. Redis can fetch 81,000 values per second with pipelining enabled.

127.0.0.1:6379> benchmark -t get -n 100000 -P 8
    GET: 81037.34 requests per second

1. Redis can process more than 1 million transactions per second with multi-exec commands.

127.0.0.1:6379> benchmark -t set,get,multi_exec -n 1000000 
  SET: 657894.74 requests per second
  GET: 1234567.75 requests per second
  MULTI_EXEC: 1157407.41 requests per second

It's worth noting that these benchmarks were performed on a local machine, and your mileage may vary depending on your hardware, network topology, and workload. However, the benchmarks provide a good indication of Redis's performance.