Prepare command line arguments and parse the output of the wrk load testing tool

var wrk = require('wrk');

var conns = 1;
var results = [];

function benchmark() {
  if (conns === 100) {
    return console.log(results);
  }
  conns++;
  wrk({
    threads: 1,
    connections: conns,
    duration: '10s',
    printLatency: true,
    headers: { cookie: 'JSESSIONID=abcd' },
    url: 'http://localhost:3000/'
  }, function(err, out) {
     results.push(out);
     benchmark();
  });
}
benchmark();

Options:

• threads
• connections
• duration
• printLatency
• headers: object with additional request headers
• url: target url
• path: path to wrk binary (default is "wrk")
• debug: print the output of wrk to stdout

Callback parameters: (err, wrkResults)

wrkResults always has:

• transferPerSec
• requestsPerSec
• requestsTotal
• durationActual
• transferTotal
• latencyAvg
• latencyStdev
• latencyStdevPerc
• latencyMax
• rpsAvg
• rpsMax
• rpsStdev
• rpsStdevPerc

Has these if printLatency is enabled

• latency50
• latency75
• latency90
• latency99

And sometimes has (only if they exist):

• connectErrors
• readErrors
• writeErrors
• timeoutErrors
• non2xx3xx

With npm do:

npm install wrk

HTTPerf.js

MIT