k2la opened a new issue #19: Improve Timing of Promise "then" URL: https://github.com/apache/pulsar-client-node/issues/19 Currently, To measure latency of sending messages, asynchronous processing using Nodejs [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) like following code: ``` const results = []; for (let mi = 0; mi < numOfMessages; mi += 1) { const startSendTimeMilliSeconds = performance.now(); results.push(producer.send({ data: message, }).then(() => { // add latency histogram.recordValue((performance.now() - startSendTimeMilliSeconds)); })); } await Promise.all(results); // wait until all messages are sent. ``` https://github.com/apache/pulsar-client-node/blob/master/perf/perf_producer.js#L88-L98 This code creates histogram about latency of sending messages. However, all `then()` of `Promise` in `results` start after `await Promise.all(results)`. So, We cannot get accurate histogram.
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