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utils.js
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utils.js
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'use strict';
const {
constants: {
NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN,
},
milestones,
} = internalBinding('performance');
function getTimeOrigin() {
// Do not cache this to prevent it from being serialized into the
// snapshot.
return milestones[NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN] / 1e6;
}
// Returns the time relative to the process start time in milliseconds.
function now() {
const hr = process.hrtime();
return (hr[0] * 1000 + hr[1] / 1e6) - getTimeOrigin();
}
// Returns the milestone relative to the process start time in milliseconds.
function getMilestoneTimestamp(milestoneIdx) {
const ns = milestones[milestoneIdx];
if (ns === -1)
return ns;
return ns / 1e6 - getTimeOrigin();
}
module.exports = {
now,
getMilestoneTimestamp,
};