20 Nov '12, 2pm

Profiling Ruby, or, How I Made Rails Start Up Faster

records that we’re spending time in a function, it can also record the whole call stack so we can blame the callers too. To do this it needs a little help from us when we compile the program we’re profiling, i.e. the Ruby interpreter — we need to pass the -pg option to gcc . Unfortunately -pg has a side effect which MRI doesn’t digest well, so we also need a patch to MRI to neutralize the side effect. Here’s the full recipe for beautiful call-graph profiles

Full article: http://blog.tddium.com/2012/11/20/profiling-ruby/

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