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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);
});