I'd like to monitor how long each run of the event loop in node.js takes. However I'm uncertain about the best way to measure this. The best way I could come up with looks like this:
var interval = 500;
var interval = setInterval(function() {
var last = Date.now();
setImmediate(function() {
var delta = Date.now() - last;
if (delta > blockDelta) {
report("node.eventloop_blocked", delta);
}
});
}, interval);
I basically infer the event loop run time by looking at the delay of a setInterval
. I've seen the same approach in the blocked node module but it feels inaccurate and heavy. Is there a better way to get to this information?
Update: Changed the code to use setImmediate
as done by hapi.js.