Persumi - Level up your writing and blogging with AI Fred Wu ifredwu@gmail.com http://persumi.com/u/fredwu http://persumi.com/u/fredwu/tech/e/blog/t/garbage collection 2026-05-25T06:53:05.028466Z <![CDATA[<p> It was made apparent to me that many ruby devs either aren’t aware or couldn’t be bothered to tweak their ruby garbage collector settings.</p> <p> Well, if you are using MRI, please start tweaking your GC settings. Here’s what I use (on my 15” Macbook Pro Retina):</p> <pre><code class="shell language-shell">export RUBY_GC_MALLOC_LIMIT=90000000 export RUBY_FREE_MIN=200000</code></pre> <p> Not only can you tweak it for your local dev machine, you can also tweak Jenkins, <a href="http://travis-ci.com/">Travis CI</a>, <a href="http://wercker.com/">Wercker</a> and other CI solutions, making instant speed gain for your test suite!</p> <p> Here’s what we get:</p> <pre><code class="shell language-shell"> Before After Local: 8m22s 5m52s Travis CI: 10m10s 6m0s Wercker: 8m45s 6m24s</code></pre> <p> YMMV depending on your system and available RAM.</p> ]]> 2013-09-06T11:13:37.000000Z Fred Wu ifredwu@gmail.com http://persumi.com/u/fredwu http://persumi.com/u/fredwu/tech/e/blog/p/protip-ruby-devs-please-tweak-your-gc-settings-for-tests 2013-09-06T11:13:37.000000Z