During the 5:40 mark of this video, it is mentioned that the non-blocking version (using fs.readFile instead of fs.readFileSync) reads files in parallel, resulting in faster execution. But how could this be possible if Node.js operates on a single thread?
Blocking:
var callback = function(err, contents) {
console.log(contents);
}
fs.readFile('/etc/hosts', callback);
fs.readFile('/etc/inetcfg', callback);
Non-blocking:
var callback = function(err, contents) {
console.log(contents);
}
fs.readFileSync('/etc/hosts', callback);
fs.readFileSync('/etc/inetcfg', callback);
Which method is actually faster and can the information presented in the video be trusted?