Ruby's external malloc problem

I have blogged a bit about the Ruby GC previously and covered some basics about malloc triggering GC runs. Over the years much in that blog post has been addressed in Ruby including dynamically growing malloc limits that mean we very rarely would need to amend malloc related GC vars. As an aside, the only GC var Discourse still overrides is RUBY_GLOBAL_METHOD_CACHE_SIZE for reasons that are specified in the Shopify blog post by Scott Francis. The GC in Ruby can be triggered by 2 different types ...

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