Improving Clojure Startup Time with Checkpoint/Restore

2023/08/05

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The article discusses how Checkpoint/Restore can be used to improve the startup time of Clojure applications. It explains that Checkpoint/Restore allows developers to create checkpoints of their applications, which can be restored later to reduce startup time. The article focuses on integrating Clojure CLI with Checkpoint/Restore, as it is simpler to understand and reverse-engineer. It provides a step-by-step guide on how to utilize Clojure CLI with Checkpoint/Restore, including how to download dependencies and save the classpath as part of the checkpoint. The article also introduces Clojure-CLI-CRaC, a drop-in replacement for Clojure CLI that automatically recreates checkpoints when needed. Additionally, it mentions an alternative way to use dependencies with Checkpoint/Restore by querying and modifying the classpath at runtime. The article concludes by highlighting the benefits of integrating Clojure CLI with Checkpoint/Restore, such as the ability to use arbitrary dependencies while enjoying faster startup times.