Multer: Performance issues

[ghost]

Hi,

I have created a small service that exposes an endpoint for a user to upload an image.

const express = require('express')
const bodyParser = require('body-parser')
const app = express()
const port = 9999
const multer = require("multer");

app.use(express.json({limit: "16mb"}));
app.use(express.urlencoded({ limit: "16mb", extended: true, parameterLimit: 50000 }));

const upload = multer();

app.get('/', (req, res) => res.send('Hello World!'))

app.post('/upload', upload.single("document"), (req, res) => {

    console.log("upload request made")
    const input = req;
    return res.json("received");

});

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

Using gatling i run a performance test against this service where the number of concurrent users grows from 1-10 over a period of 2 minutes. The image uploaded is of size 3mb i have an upload speed of 3.2. You can see the results below.

https://imgur.com/hBLJRey
https://imgur.com/4eDxGMa

The minimum response time is 10seconds the mean is 29 seconds and the 99th percentile is 72 seconds. I have replicated this test 2-3 times with the same result.

I have ran clinic doctor,flame and bubbleprof to try and see the cause of the bottleneck. You can find the results below.

https://drive.google.com/file/d/1gA819KL-5OJj3QzBXi_xY_B9Lmrzwjno/view?usp=sharing

I'm looking for ways to improve the performance as my service will expect many concurrent users.

[ghost]

This turned out to be an issue with gatling, if youre running testing locally must set the hostname otherwise performance is hindered.