Seven NoSQL Databases in a Week

Virtualization versus on-the-metal

As Redis IO indicates in its documentation,^[6] it is preferable to deploy Redis on a physical machine over a VM. This is because a VM will have a higher intrinsic latency, or rather latency that we cannot improve upon with any amount of server or application configuration.

The redis-cli does have a means by which to measure intrinsic latency. Simply run the following on your Redis server (not the client), from the redis directory. It will measure latency on the machine (Redis does not need to be running) for a period of 30 seconds:

src/redis-cli --intrinsic-latency 30

Running this command (after installing Redis) will return output similar to this:

Max latency so far: 1 microseconds.
Max latency so far: ...