Heroku doesn't provide any help in this regard. The approach I used was to heroku run bash to enter a bash shell and then run rails runner to load the Rails app via time NEW_RELIC_AGENT_ENABLED=false rails runner 'puts "done"'. The first run provides the number you want to pay attention to. For subsequent runs the bootsnap cache will be in place whether you enabled the lab feature or not.
Note that I explicitly turned off the NewRelic agent via ENV since I found that otherwise NewRelic adds ~4s of irrelevant boot time noise (ie. it would not be present when running rails console).
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How did you benchmark your boot time on Heroku? Are there any metrics in the Heroku dashboard?
Heroku doesn't provide any help in this regard. The approach I used was to
heroku run bashto enter a bash shell and then runrails runnerto load the Rails app viatime NEW_RELIC_AGENT_ENABLED=false rails runner 'puts "done"'. The first run provides the number you want to pay attention to. For subsequent runs the bootsnap cache will be in place whether you enabled the lab feature or not.Note that I explicitly turned off the NewRelic agent via ENV since I found that otherwise NewRelic adds ~4s of irrelevant boot time noise (ie. it would not be present when running
rails console).