The difference between Redis and memcache

The difference between Redis and memcache

Data type:

Redis data type rich, support set Liset and other types
Memcache supports simple data types and requires clients to handle complex objects themselves

Durability:

Redis supports data-on-ground persistent storage
Memcache does not support data persistent storage

Distributed storage:

Redis supports Master-slave replication mode
Memcache can be distributed using consistent hash

Value differs in size:

Memcache is a memory cache, the key is less than 250 characters in length, and a single item store is less than 1M, not suitable for use by a virtual machine

Data consistency is different:

Redis uses a single-threaded model to ensure that the data is submitted sequentially.
Memcache need to use CAS to ensure data consistency. CAS (Check and Set) is a mechanism for ensuring concurrency consistency and belongs to the "optimistic lock" category; The principle is simple: take the version number, the operation, the comparison version number, if the same operation, inconsistent to abandon any operation

CPU Utilization:

The Redis single-threaded model can use only one CPU to open multiple Redis processes

The difference between Redis and memcache