How to fix an Express memory leak?

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Recently, some of our users encountered an express memory leak error. This problem can occur for several reasons. We will review them now.

I have a heavy Express.js web application that keeps crashing due to memory issues:

FATAL ERROR: CALL_AND_RETRY_LAST allocation failed - JavaScript heapmemory

When I start the service, the memory usage is typically around 170MB (reported by htop as RES memory). Then I run queries and the memory starts to grow.I ran memwatch to try and track down circumstances that look like a memory leak, but reported memwatch.HeapDiff():

{ something before jumping to: nodes: Size_bytes: 2093729, 197165296, size: '188.03 mb', at: nodes: Size_bytes: 2491264, 232097040, size: '221.34MB',  ...

… where I understand the program is using 221.34 MB for the heap; However, htop uses 2 GB of memory when it fails.

The question might arise: if my assumptions are correct, what can use memory without a heap that says htop reported it as RES memory?

Since my husband, myself and @dougwilson tested this, we’ll boil it down to this:

// configuration ============================================== ================// Get all the special symbols we needToolslet ejs = require('ejs');var means http require('http');var path = required('path');var server means http.createServer(function(req, res)var filename = path.join(__dirname, 'index.min.ejs');ejs.renderFile(filename, run(error, string)res.end(str);););// start ============================================== =================server.listen(81)function generateHeapDumpAndStats()    //1.Force capture bs every time this function is definitely called   To attempt        global.gc();     Grab        console.log("You need to run the program with --expose-gc'"); 'node process.exit();        //2. Print heap statistics    var heapUsed = process.memoryUsage().heapUsed;    console. log('Program uses ' + heapUsed + i heap bytes.');setInterval(generate HeapDumpAndStats, 3000);

Memory leaks are still a problem every developer has to deal with sooner or later. They are more common in languages, perhaps where the language automatically handles the memory of most people. Memory leaks can lead to issues such as slow apps, crashes, high latency, and more.

express memory leak

In this blog post, we’ll all look at what memory leaks are in general and how to avoid them.Be in a NodeJS application. While this is much more focused on NodeJS, in general it should also work with JavaScript and TypeScript. Memory avoidance allows your application to use resources efficiently and also improves performance.

For memory leaks in Node.js, you can also look at AppSignal Application Form Monitor for Node.js. As of version 1.2.0 it comes with a toolbar showing the size of your top level contexts and especially the currently active top level contexts. No tools required.

JavaScript Memory Management

In order to understand memory water leaks, we must first understand how memory is no doubt managed in NodeJS. This means understanding how memory is managed by the JavaScript engine used by NodeJS. NodeJS usually uses the V8 engine for JavaScript. You should read the document Visualizing memory management in the V8 engine to better understand how memory works and how JavaScript is used in V8.

Stack: Here is a static file including method/function structures, primitive values, and memory objects for ssecurity. This memory space is obviously managed by the operating system (OS).
Heap: This is where V8 stores objects or variable data. This is the block with the largest memory area where garbage collection (GC) occurs.

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V8 supports implicit garbage collection on the heap. Simply put, this releases the memory used by the orphaned objects that my husband and I are, i.e., H objects that are no longer referenced directly on the stack, or (through an indirect reference to another object) that have to do with the creation of new objects .

The V8 garbage collector is responsible for reclaiming unused RAM so that Process v8 can reuse it. v8 garbage collectors are generational (items in the heap are grouped by age and removed at different stages). Rally V8 uses two periods and three different algorithms to get money.