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'use strict';
const {
constants: {
NODE_PERFORMANCE_MILESTONE_LOOP_START,
},
loopIdleTime,
milestones,
} = internalBinding('performance');
function eventLoopUtilization(util1, util2) {
// Get the original milestone timestamps that calculated from the beginning
// of the process.
return internalEventLoopUtilization(
milestones[NODE_PERFORMANCE_MILESTONE_LOOP_START] / 1e6,
loopIdleTime(),
util1,
util2,
);
}
function internalEventLoopUtilization(loopStart, loopIdleTime, util1, util2) {
if (loopStart <= 0) {
return { idle: 0, active: 0, utilization: 0 };
}
if (util2) {
const idle = util1.idle - util2.idle;
const active = util1.active - util2.active;
return { idle, active, utilization: active / (idle + active) };
}
// Using process.hrtime() to get the time from the beginning of the process,
// and offset it by the loopStart time (which is also calculated from the
// beginning of the process).
const now = process.hrtime();
const active = now[0] * 1e3 + now[1] / 1e6 - loopStart - loopIdleTime;
if (!util1) {
return {
idle: loopIdleTime,
active,
utilization: active / (loopIdleTime + active),
};
}
const idleDelta = loopIdleTime - util1.idle;
const activeDelta = active - util1.active;
const utilization = activeDelta / (idleDelta + activeDelta);
return {
idle: idleDelta,
active: activeDelta,
utilization,
};
}
module.exports = {
internalEventLoopUtilization,
eventLoopUtilization,
};
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