http://www.movesonrails.com/articles/tag/nested?tag=nested en-us 40 New ways to look at software <p>As our mongrels were using up quite a lot of memory, so I tried to figure out what was causing this.</p> <p>When running the app locally I found out that one certain page caused the mongrel to grow from 60 to 190 megabytes. A whopping 130 megabytes!</p> <p>After commenting out some of the code, I realized that a single line was causing all of the memory usage </p> <pre><code>contracts = Contract.find( :all, :conditions =&gt; ['contracts.employee_id IN (?) ', employees ], :include =&gt; [:expertise_profile =&gt; :qualifications ] ) </code></pre> <p>Ouch! The nested include of rails somehow leaks a large amount of memory. The fix was a piece of cake.</p> <pre><code>contracts = Contract.find( :all, :conditions =&gt; ['contracts.employee_id IN (?) ', employees ], :include =&gt; :expertise_profile ) </code></pre> <p>Now my mongrel stays at 60 megabytes. I don't know if this issue persists in the new 2.1 Rails, but I'll check that soon!</p> Wed, 02 Jul 2008 15:59:00 +0200 urn:uuid:1a3ee134-137c-49b9-9d0d-9d868a301f41 bart.tenbrinke@movesonrails.com (Bart ten Brinke) http://www.movesonrails.com/articles/2008/07/02/nested-include-has-major-memory-leak-rails-2-0-1 Rails find nested include memory rails