While I don't have any personal news to share this time, I'm excited to bring you an interesting Nuxt tip on how to analyze memory leaks. Dive in and enjoy this issue!
👉🏻 For performance reasons, it now supports tree-shaking for the OAuth providers.
🔥 Analyze Memory Leaks in Your Nuxt App
In one of my client projects, we recently had to analyze and fix a memory leak in our Nuxt 3+ application. Let me share my experience and our steps to identify and fix the memory leak.
What is a Memory Leak?
A memory leak occurs when a program allocates memory but doesn't release it when it's no longer needed. Over time, this can lead to the exhaustion of system resources and the application crashing.
In our case, the memory leak caused our Kubernetes pods to restart frequently, forcing us to increase the resources allocated to the pods. However, this was only a temporary solution, and we had to find and fix the root cause of the memory leak.
Finding the Memory Leak
The first step in fixing a memory leak is identifying the root cause. Here are the steps we took to find the memory leak in our Nuxt application.
First, it's important to note that we use Hybrid Rendering in our application, which means that the server-side rendering (SSR) and client-side rendering (CSR) are combined. Technically, a Node.js server is deployed, so we had to monitor the memory usage of the Node.js process.
Step 1: Monitor Memory Usage
The first step is to monitor your application's memory usage. In our case, this only happened in production, so we had to monitor the memory usage of our application's production build.
To debug a production build of your Nuxt app in Visual Studio Code, you have to define a launch configuration in your .vscode/launch.json.vscode/launch.json file. Here is an example configuration:
In our scenario, we saw that the memory usage of the Node.js process increased over time and with each request, which indicated that there was a memory leak.
Step 3: Find the Root Cause
One approach to finding the root cause of a memory leak is to use git bisect to identify the commit that introduced the memory leak. This approach can be time-consuming, but it can help you narrow down the code that caused the memory leak.
In our project, we identified that we defined some watchers after an awaitawait in a Nuxt page component which caused the memory leak. Because we only needed those watchers on the client, we wrapped them in the onMountedonMounted lifecycle hook which fixed the memory leak.
📅 Events
PrageVue 2024 (17 September 2024, Prag, Czech Republic)
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