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2018-04-25 MRI, the standard Ruby interpreter, has a serious problem with memory bloat in large Rails apps. It’s quite common for me to see Sidekiq processes which are 1-2GB in RSS or even larger! It turns out that a large part of this memory usage is due to memory fragmentation: MRI uses the OS’s memory allocator by default (on Linux, almost always GNU glibc), which seems to work poorly with Ruby
One of the earliest projects I was involved in at Valiant was investigating ways to optimise performance and memory consumption in our Rails web application. Although I had heard the age-old complaints about Rails applications being slow, bulky and prone to memory bloat, I had yet to come across any practical, easy-to-navigate solutions to these issues. Until we discovered jemalloc. In this blog p
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