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What's this RailsApp.preload_all method mentioned in this post? Is that a github thing?

Great post btw. I am looking forward to getting some production apps onto 2.1 in the coming weeks and seeing how performance characteristics have changed in the new release.

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We implement preload_all, which loops over app/{models,controllers}/ and requires everything. This method is generally called from config.ru, and happens in the unicorn master before it forks off workers.

I recently upstreamed a warmup method for Rack::Builder you can also use for this purpose: https://github.com/rack/rack/pull/617

Thanks for that link (and for submitting it!). I've done something similar in deploy scripts, to warm up a fresh instance before bringing it into rotation - even better having it able to be baked into rack like that.

That's interesting. Thanks for sharing. I'll have to check this out.

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