difference between TOP vs application

[zombocom]

difference between TOP vs application

[bebeun]

ok,
RAILS_ENV=production bundle exec derailed exec perf:mem
gives
TOP: 179.6563 MiB
application: 35.5156 MiB
while
bundle exec derailed bundle:mem production
gives
TOP: 51.0273 MiB
rails/all: 18.7852 MiB

I really don't understand the difference.

Any help ?

[schneems]

TOP is the amount of memory that is consumed by the whole process.

bundle:mem does not actually boot your app, it only loads your dependencies into memory, so basically we're saying that 51mb of memory come from just loading your dependencies. perf:mem also boots your application. This is important because sometimes gems or code are lazy loaded i.e. if you have require 'foo' somewhere in the boot process itself. Rails will do this, it only loads the things it needs as it needs them. So 179mb is the likely actual RAM use of your app when it first boots but has not yet done taken any requests.

I think application refers to the code in your app, as opposed to dependencies, but I kinda forget. If you have a full output and can post to a gist, I can maybe be of more help.