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Dennis Gustafsson – Parallelizing the physics solver – BSC 2025

Better Software Conference · 77.6K views · 2025-07-18 · 1:07:09

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Overview

Dennis Gustafsson, creator of Teardown, presents how he parallelized the physics solver for an upcoming game, followed by a Q&A. The talk was given at the Better Software Conference 2025.

On Hacker News

HN points to it as a practical example of solving a tricky multithreading problem, including using a spinlock to speed up a real-time physics solver.

Recommended by 2 HN people across 2 months · HN mentions 2025–2026

Topics

Game programming & enginesSoftware performance & optimization
Search by tags
physics solvermultithreadingspinlockgame enginesteardown

What people said

Hikikomori · 2026-03 · Recommendation

Not about multiplayer but still interesting. Dennis Gustafsson – Parallelizing the physics solver – BSC 2025 [VIDEO]

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fasterik · 2026-01 · Recommendation

As always: use standard libraries, profile, then write your own if the data indicates it's necessary. The following is an interesting talk where the author used a spinlock to speed up a real-time physics solver significantly. Dennis Gustafsson – Parallelizing the physics solver – BSC 2025 [VIDEO]

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levodelellis · 2025-11 · Reference

From my understanding this talk describes how he implemented a solution for a similar problem [VIDEO] I'm saying if you're not writing multi-threaded code everyday, use a library. It can use atomics/locks but you shouldn't use it directly. If the library is designed well it'd be impossible to deadlock.

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Sources

Video by Better Software Conference, played through YouTube.

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