Simon Willison • 1/15/2026

The Design & Implementation of Sprites

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This article details the technical implementation of Fly.io's 'Sprites'—disposable compute instances. It explains how they achieve fast provisioning by maintaining warm pools of pre-configured machines and describes their custom persistence layer, which uses a JuiceFS-like model with SQLite metadata backed by Litestream and S3-compatible object storage for data chunks.

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#serverless #Object Storage #Container Orchestration
The Design & Implementation of Sprites

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