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Showing content from https://github.com/nodejs/node/issues/43128 below:

High cpu usage for outbound ssl requests after upgrading from v16.15.0 to v18.1.0 · Issue #43128 · nodejs/node · GitHub

v18.1.0

Linux 5.17.4-arch1-1 #1 SMP PREEMPT Wed, 20 Apr 2022 18:29:28 +0000 x86_64 GNU/Linux

crypto

I have observed this problem in few http clients: axios, got. But looks like a problem is in node.js itself.

1. Create a basic http server which produces outbound ssl requests and returns in response result of outbound request. Here is a sample

const http = require("http");
const https = require("https");

const port = 3000;

const handler = (req, res) => {
  https.get("https://server.local", (response) => {
    let body = "";

    response.on('data', chunk => {
      body += chunk;
    });

    response.on("end", () => {
      res.statusCode = response.statusCode;
      res.setHeader('Content-Type', 'text/plain');
      res.end(body);
    });
  });
};

const server = http.createServer(handler);

server.listen(port);

1. Start to produce load to server. I'm using hey

hey -z 1m -c 10 -disable-keepalive "http://client.local:3000"

1. Observe in CPU profiler for node.js server constantly increasing cpu usage for SecureContext.init(). It starts from ~50% and going up to 80%. Amount of requests processed by server, which sends outbound https requests is constantly decreasing.

Always reproduces if present outbound ssl requests and node version 18.1.0

Constant CPU usage, amount of processed requests is at the same level during time. In node.js v16.15.0 same code in CPU profiler have SecureContext.init() with usage of 5-8%. And during load there is no performance degradation.

CPU usage is keeping increasing during time, SecureContext.init() starts from ~50% cpu time in profiler and keep growing during time to 80-85%. Amount of requests processed by server is constantly decreasing.

v18.1.0
Benchmark result - 186 req/s
node --perf output - https://pastebin.com/wyHPXfMH
cpu profile screenshot

v16.15.0
Benchmark result - 1184 req/s
node --perf output - https://pastebin.com/0L0Z01iq
cpu profile screenshot

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