\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// File Manager

File Manager

Path: /opt/alt/alt-nodejs11/root/lib/node_modules/npm/node_modules.bundled/lockfile/

Viewing File: speedtest.js

const path = require('path');
const async = require('async');
const lf = require('lockfile');
const fs = require('fs');

const n = +process.argv[3] || 300;
const a = Array.apply(null, {length: n}).map(function(_, i) {
  return i
})
const file = path.resolve(__dirname, 'speed-test.lock');

try{
    fs.unlinkSync(file);
}
catch(e){}


/// NOTE: this should run in about 30ms on a SSD Ubuntu 16.04, that is fast, because we are locking/unlocking 300 locks
/// *HOWEVER* if we change async.eachSeries to async.each, lockfile will barf immediately, and I can't get lockfile
/// to not barf, using any of the options {} available to lockfile#lock.


const parallel = process.argv[2] === 'parallel';

var fn, msg;

if(parallel){
    msg = 'parallel';
    fn = async.each;
}
else{
    msg = 'series';
    fn = async.eachSeries;
}


const start = Date.now();
console.log(' => locking/unlocking ' + a.length + ' times, in ' + msg);

fn(a, function (val, cb) {

    console.log('try %d', val)

    lf.lock(file, { retries: n * 3 }, function (err) {
        if (err) {
            cb(err);
        }
        else {
            console.log('complete %d', val)
            lf.unlock(file, cb);
        }
    });

}, function complete(err) {

    if (err) {
        throw err;
    }

    console.log(' => Time required for lockfile => ', Date.now() - start, 'ms');
    process.exit(0);

});