Use the memory attribute to specify the memory limit for all instances of an app. This attribute requires a unit of measurement: M, MB, G, or GB, in upper case or lower case. For example:

---
  ...
  memory: 1024M

The default memory limit is 1G. You might want to specify a smaller limit to conserve quota space if you know that your app instances do not require 1G of memory.

The command line option that overrides this attribute is -m.