This article in the 'Scaling Rails' series addresses the importance of optimal thread count in Ruby on Rails applications. It emphasizes that insufficient threads lead to wasted processing capabilities, while excessive thread count can result in Global VM Lock (GVL) contention, causing increased latency. The piece illustrates how to strategically tune Puma's max thread configuration using GVL instrumentation to achieve balanced performance. The goal is to maximize efficiency without incurring delays due to overloading the system with too many concurrent threads.
Finding the correct number of threads for your Ruby on Rails process is crucial; having too few can waste processing power while too many can lead to GVL contention.
Understanding the Global VM Lock (GVL) is vital when tuning your Puma server's thread count. Proper instrumentation helps in optimizing performance without bottlenecks.
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