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lib/internal/perf/event_loop_utilization.js
60 строк
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Antoine du Hamel
lib: enforce use of trailing commas for functions
14 фев 2023, 20:45
Не верифицирован
14 фев 2023, 20:45
fe514bf
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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, };