Parallel run test for ESLint

run.js

const workerFarm = require("worker-farm");
const FARM_OPTIONS     = {
          maxConcurrentWorkers        : require('os').cpus().length
        , maxCallsPerWorker           : Infinity
        , maxConcurrentCallsPerWorker : 1
      };

const workers = workerFarm(FARM_OPTIONS, require.resolve("./worker"));
let ret = 0;

const isMulti = process.argv[2] && parseInt(process.argv[2], 10) === 1;

if (isMulti) {
    console.log("Multi");
    const patterns = [
        ["lib/**/*.js"],
        ["lib1/**/*.js"],
        ["lib2/**/*.js"],
        ["lib3/**/*.js"],
        ["lib4/**/*.js"],
        ["lib5/**/*.js"],
        ["tests/**/*.js"],
        ["tests1/**/*.js"],
        ["tests2/**/*.js"],
        ["tests3/**/*.js"],
        ["tests4/**/*.js"],
        ["tests5/**/*.js"]
    ];
    const maxRet = patterns.length;

    for (var i = 0; i < maxRet; i++) {
        workers(patterns[i], function (err, outp) {
            console.log("done");
            if (++ret === maxRet)
                workerFarm.end(workers)
        })
    }
}
else {
    console.log("Single");
    const workerMod = require("./worker");
    const maxRet = 1;
    const patterns = [
        ["lib/**/*.js", "lib1/**/*.js", "lib2/**/*.js", "lib3/**/*.js", "lib4/**/*.js", "lib5/**/*.js", "tests/**/*.js", "tests1/**/*.js", "tests2/**/*.js", "tests3/**/*.js", "tests4/**/*.js", "tests5/**/*.js"]
    ];

    for (var i = 0; i < maxRet; i++) {
        workerMod(patterns[0], function (err, outp) {
            //console.log("done");
            console.log("done", outp.results.length);
            if (++ret === maxRet)
                workerFarm.end(workers)
        })
    }
}

setup.md

Setup

1. Clone ESLint and run npm install
2. Copy above 2 files inside the ESLint folder
3. create 5 copies of the lib folder
4. create 5 copies of tests folder
   • Makesure you remove bench, fixtures and performance folders from tests<1 to 5> folders.
5. Single Run: time node run.js
6. Parallel run: time node run.js 1
   • for other runs just comment out different globs

worker.js

const CLIEngine = require("./lib/cli-engine");
const engine = new CLIEngine({});

module.exports = (pattern, callback) => {
    const fileConfig = engine.executeOnFiles(pattern);

    callback(null, fileConfig);
};

My machine: Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz, 8gb ram