actionhero/dist/modules/utils/eventLoopDelay.js

actionhero.js is a multi-transport API Server with integrated cluster capabilities and delayed tasks

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.eventLoopDelay = void 0;
const asyncWaterfall_1 = require("./asyncWaterfall");
/**
 * Returns the average delay between a tick of the node.js event loop, as measured for N calls of `process.nextTick`
 */
async function eventLoopDelay(iterations = 10000) {
    const jobs = [];
    const sleepyFunc = async () => {
        return new Promise((resolve) => {
            const start = process.hrtime();
            process.nextTick(() => {
                const delta = process.hrtime(start);
                const ms = delta[0] * 1000 + delta[1] / 1000000;
                resolve(ms);
            });
        });
    };
    let i = 0;
    while (i < iterations) {
        jobs.push(sleepyFunc);
        i++;
    }
    const results = await asyncWaterfall_1.asyncWaterfall(jobs);
    let sum = 0;
    results.forEach((t) => {
        sum += t;
    });
    const avg = Math.round((sum / results.length) * 10000) / 1000;
    return avg;
}
exports.eventLoopDelay = eventLoopDelay;