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It doesn't look like this has ANYTHING to do with Mongrel, Apache, or HTTP at all!

He had ridiculous memory leaks from ActiveRecord/Rails under the older 'stable' version of Ruby he was using with Mongrel. When he switched to Passenger, which uses a patched/forked version of Ruby (the hilariously named "Ruby Enterprise Edition"), his Rails memory leak went away.

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This is correct. It's REE - mod_rails has almost nothing to do with these results.

REE alone halved our response times and our memory usage across our Rails cluster. We're stll on mongrel/nginx.

Possibly, but wouldn't know without testing that.

Still doesn't address the global queue issue.

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