Docker containers provide significantly lower resource usage and higher density than traditional virtual machines when running multiple workloads concurrently on a server.
When booting 15 Ubuntu VMs with MySQL sequentially, Docker containers boot on average 3.5 seconds compared to 5.8 seconds for KVMs. During steady state operation of 15 active VMs, Docker uses on average 0.2% CPU and 49MB RAM per container, while KVMs use 1.9% CPU and 292MB RAM each. Docker maintains low 1-minute load averages of 0.15, while KVMs average 35.9% under load.