checkoutput.js

const MongoClient = require("mongodb").MongoClient;
const util = require('util')


const MONGOURI = "MONGOURL";
const DB = "lever-hire-nurture";
const COLL = "profiles";

const client = new MongoClient(MONGOURI, { useNewUrlParser: true, useUnifiedTopology: true });
  client.connect(err => {
    if (err) {
      console.error(err);
      return;
    }

    /* Client Collection */
    const coll = client.db(DB).collection(COLL);


    async function main() {
      const pr = [];
      for (let i =0; i<5; i++) {
        pr.push(coll.find({}).explain("executionStats"));
      }
      
      const res = await Promise.all(pr);
      console.log("Output :");
      console.log(util.inspect(res, false, null, true))
    }
    
    main().catch(console.error)
});

loader.js

const cluster = require('cluster');
const numCPUs = require('os').cpus().length - 2;
const MongoClient = require("mongodb").MongoClient;
const { LoremIpsum } = require("lorem-ipsum");
const express = require("express");

const NUM_THREADS = numCPUs;
const MONGOURI = "MONGOURL";
const DB = "test_db";
const COLL = "test_coll";
const batchSize = 2000;
const docLength = 8;
const reqsize = 100000


if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`);

  // Fork workers.
  for (let i = 0; i < NUM_THREADS; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`);
  });

} else {
  const app = express();
  
  const client = new MongoClient(MONGOURI, { useNewUrlParser: true, useUnifiedTopology: true });
  client.connect(err => {
    if (err) {
      console.error(err);
      return;
    }

    /* Client Collection */
    const coll = client.db(DB).collection(COLL);

    /* Lorem Ipsum Generator */
    /* USAGE - lorem.generateWords */
    const lorem = new LoremIpsum({
      sentencesPerParagraph: {
          max: 8,
          min: 4
      },
      wordsPerSentence: {
          max: 16,
          min: 4
      }
    });
  
    /* Generate Sample Document */
    function generateSampleDocument(batchSize, docLength) {
      const types = ["string", "date"];
      const wBatch = [];
        const doc = {
          field1: lorem.generateWords(),
          field2: lorem.generateWords(),
          field3: lorem.generateWords(),
          field4: lorem.generateWords(),
          cdt: new Date(),
          udt: new Date()
        }
    
      return doc;
    }

    async function main() {
      const promises = [];

         for (let index = 0; index < reqsize; index++) {
        promises.push(coll.insertOne(generateSampleDocument()));
      }
      
      const intrval = setInterval(() => {
        console.log("Inserting ", promises.length, " Documents")
      }, 1000);
      
      const response = await Promise.all(promises);
      clearInterval(intrval);
    }
    
    main().catch(console.error)
  });
}

package.json

{
  "name": "poc-tool-node",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1",
    "lorem-ipsum": "^2.0.3",
    "mongodb": "^3.6.1"
  }
}