---
title: "Tuning Puma max_threads Configuration with GVL Instrumentation"
url: https://daily.dev/posts/tuning-puma-max-threads-configuration-with-gvl-instrumentation-pu7mjemel
source_url: https://www.bigbinary.com/blog/tuning-puma-max-threads-configuration-with-gvl-instrumentation
type: article
source: "BigBinary"
published: 2025-05-06T14:57:06.696Z
updated: 2025-05-06T14:57:30.925Z
tags: ["performance", "ruby", "rails"]
reading_time: 6
upvotes: 0
comments: 0
language: en
---

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# Tuning Puma max_threads Configuration with GVL Instrumentation

**[BigBinary](https://daily.dev/sources/bigbinary)** · 6 min read · 0 upvotes · 0 comments

## Summary

The post explores tuning the max_threads configuration for Puma in Rails applications using GVL instrumentation. The methodology involves measuring I/O time and calculating thread efficiency through Amdahl's law. It introduces 'perfm' middleware to help analyze the data. The process involves iterating thread settings to minimize GVL contention and maximize concurrency, with final recommendations for thread counts based on empirical data.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.bigbinary.com/blog/tuning-puma-max-threads-configuration-with-gvl-instrumentation>

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---

Tags: [#performance](https://daily.dev/tags/performance), [#ruby](https://daily.dev/tags/ruby), [#rails](https://daily.dev/tags/rails)

[View this post on daily.dev](https://daily.dev/posts/tuning-puma-max-threads-configuration-with-gvl-instrumentation-pu7mjemel)