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Microservice Optimizations

Docker by default gives unlimited access to the host CPU cycles, which could lead to containers taking more that required. The user is capable of limiting this by adding runtime flags when launching a container.

Docker CPUSet

The user can limit the number of cores that a container has access to. This can be accomplished by using runtime flag --cpuset-cpus. This flag is a comma separated list or a hyphen separated range.

Docker CPUSet Example

• Comma seperated list

  docker run -it --cpuset-cpus=2,3 ubuntu:20.04 /bin/bash
  

• Hyphen seperated range

  docker run -it --cpuset-cpus=1-3 ubuntu:20.04 /bin/bash
  

Docker CPUS

Docker also provides a runtime flag --cpus which limits the CPU resources that it is allowed to access. This is different from --cpuset-cpus in that it does not specify which specific cores that the container will use, rather the total CPU resources out of the total cores.

Docker CPUS Example

docker run -it --cpus=1.5 ubuntu:20.04 /bin/bash