var start = +new Date();
var counter = 0;
for(var i = 1; i < LIMIT; i++){
    ++counter;
    db.users.save({id : i, name : "MongoUser [" + i + "]"}, function(err, saved) {
          if( err || !saved ) console.log("Error");
          else console.log("Saved");
          if (--counter === 0) 
          {
              var end = +new Date();
              console.log("all users saved in " + (end-start) + " milliseconds");
          }
    });
}

我从AWS转到Azure时也遇到了同样的问题

对于express和aws，您已经可以使用，existing time()和timeEnd()

对于Azure，使用这个: https://github.com/manoharreddyporeddy/my-nodejs-notes/blob/master/performance_timers_helper_nodejs_azure_aws.js

这些time()和timeEnd()使用现有的hrtime()函数，提供高分辨率的实时时间。

希望这能有所帮助。

var start = +new Date();
var counter = 0;
for(var i = 1; i < LIMIT; i++){
    ++counter;
    db.users.save({id : i, name : "MongoUser [" + i + "]"}, function(err, saved) {
          if( err || !saved ) console.log("Error");
          else console.log("Saved");
          if (--counter === 0) 
          {
              var end = +new Date();
              console.log("all users saved in " + (end-start) + " milliseconds");
          }
    });
}

你也可以试试exectimer。它会给你这样的反馈:

var t = require("exectimer");

var myFunction() {
   var tick = new t.tick("myFunction");
   tick.start();
   // do some processing and end this tick
   tick.stop();
}

// Display the results
console.log(t.timers.myFunction.duration()); // total duration of all ticks
console.log(t.timers.myFunction.min()); // minimal tick duration
console.log(t.timers.myFunction.max()); // maximal tick duration
console.log(t.timers.myFunction.mean()); // mean tick duration
console.log(t.timers.myFunction.median()); // median tick duration

现在有一种更简单的方法来使用exectime。你的代码可以这样包装:

var t = require('exectimer'),
Tick = t.Tick;

for(var i = 1; i < LIMIT; i++){
    Tick.wrap(function saveUsers(done) {
        db.users.save({id : i, name : "MongoUser [" + i + "]"}, function(err, saved) {
            if( err || !saved ) console.log("Error");
            else console.log("Saved");
            done();
        });
    });
}

// Display the results
console.log(t.timers.myFunction.duration()); // total duration of all ticks
console.log(t.timers.saveUsers.min()); // minimal tick duration
console.log(t.timers.saveUsers.max()); // maximal tick duration
console.log(t.timers.saveUsers.mean()); // mean tick duration
console.log(t.timers.saveUsers.median()); // median tick duration

有一种方法是专门为这个设计的。签出process.hrtime();．

我基本上把这个放在应用的顶部。

var start = process.hrtime();

var elapsed_time = function(note){
    var precision = 3; // 3 decimal places
    var elapsed = process.hrtime(start)[1] / 1000000; // divide by a million to get nano to milli
    console.log(process.hrtime(start)[0] + " s, " + elapsed.toFixed(precision) + " ms - " + note); // print message + time
    start = process.hrtime(); // reset the timer
}

然后我用它来看看函数需要多长时间。下面是一个基本的例子，打印一个名为"output.txt"的文本文件的内容:

var debug = true;
http.createServer(function(request, response) {

    if(debug) console.log("----------------------------------");
    if(debug) elapsed_time("recieved request");

    var send_html = function(err, contents) {
        if(debug) elapsed_time("start send_html()");
        response.writeHead(200, {'Content-Type': 'text/html' } );
        response.end(contents);
        if(debug) elapsed_time("end send_html()");
    }

    if(debug) elapsed_time("start readFile()");
    fs.readFile('output.txt', send_html);
    if(debug) elapsed_time("end readFile()");

}).listen(8080);

下面是一个可以在终端(BASH shell)中运行的快速测试:

for i in {1..100}; do echo $i; curl http://localhost:8080/; done

可以使用包装器函数轻松地报告任何现有函数的执行时间。

包装器用于扩展现有函数，以便在现有函数执行之前和之后执行某些操作——这是一种组合逻辑的方便方法。

下面是一个使用withDurationReporting包装器的例子:

// without duration reporting
const doSomethingThatMayTakeAWhile = async (someArg: string, anotherArg: number) => { 
  /** your logic goes here */
}

// with duration reporting
const doSomethingThatMayTakeAWhileWithReporting = withDurationReporting(
  'doSomethingThatMayTakeAWhile', 
  doSomethingThatMayTakeAWhile
);

// note: you can define the function with duration reporting directly, too
const doSomethingThatMayTakeAWhile = withDurationReporting(
  'doSomethingThatMayTakeAWhile', 
  async (someArg: string, anotherArg: number) => { 
    /** your logic goes here */
  }
)

这是包装器本身:

import { hrtime } from 'process';

const roundToHundredths = (num: number) => Math.round(num * 100) / 100; // https://stackoverflow.com/a/14968691/3068233

/**
 * a wrapper which reports how long it took to execute a function, after the function completes
 */
export const withDurationReporting = <R extends any, T extends (...args: any[]) => Promise<R>>(
  title: string,
  logic: T,
  options: {
    reportingThresholdSeconds: number;
    logMethod: (message: string, metadata?: Record<string, any>) => void;
  } = {
    reportingThresholdSeconds: 1, // report on anything that takes more than 1 second, by default
    logMethod: console.log, // log with `console.log` by default
  }, 
) => {
  return (async (...args: Parameters<T>): Promise<R> => {
    const startTimeInNanoseconds = hrtime.bigint();
    const result = await logic(...args);
    const endTimeInNanoseconds = hrtime.bigint();
    const durationInNanoseconds = endTimeInNanoseconds - startTimeInNanoseconds;
    const durationInSeconds = roundToHundredths(Number(durationInNanoseconds) / 1e9); // https://stackoverflow.com/a/53970656/3068233
    if (durationInSeconds >= options.reportingThresholdSeconds)
      options.logMethod(`${title} took ${durationInSeconds} seconds to execute`, { title, durationInSeconds });
    return result;
  }) as T;
};