Nate Berkopec • 12/4/2017

Malloc Can Double Multi-threaded Ruby Program Memory Usage

This technical article investigates a major source of memory fragmentation in multi-threaded CRuby applications, specifically Sidekiq processes. It explains how malloc's per-thread memory arenas can double memory usage and demonstrates how configuring the MALLOC_ARENA_MAX environment variable to 2 can cut memory consumption in half, while also discussing the trade-offs and applicability of this fix.

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#malloc #ruby #Multithreading