I have a big and stable Rails application which has been running in production for 5 years. Each time I deploy the code using Capistrano and I've noticed that deploying time is getting slower. It takes 5 minutes longer than we are used to. Looking through the logs, I've noticed that the task bundle exec rake db:migrate takes 5 minutes. It was unusual!
I've done some manipulations with a deploy script. I noticed that due to the creation of new release, the first run bundle exec <COMMAND> is terribly slow. I was shocked. I had idea that there is something with code initializing or with caching.
I use Bootsnap for each my Rails application and I've noticed one thing:
Note also that Bootsnap will never clean up its own cache: this is left up to you.
Depending on your deployment strategy, you may need to periodically purge tmp/cache/bootsnap*.
If you notice deploys getting progressively slower, this is almost certainly the cause.
Yes, it was the answer! After some years of using Bootsnap on the server it has written caches for 180 Mbs. I have deleted all cache files using rm tmp/cache/bootsnap* and It helps me. Be aware, if you are using Bootsnap and your application is getting slower on the boost, maybe there is a problem with a large amount of cache.
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