我正在尝试使用amqp.node(https://github.com/squaremo/amqp.node)测试Rabbitmq延迟。
这是消费者:
import amqp from 'amqplib';
amqp.connect('amqp://localhost').then((connection) => {
connection.createChannel().then((channel) => {
const queue = 'test1';
channel.assertQueue(queue, { durable: false }).then(()=>{
var consumedMessages = 0;
channel.consume(queue, (msg) => {
const timestamp = new Date().getTime();
consumedMessages++;
if (msg != null) console.log(`consumed ${consumedMessages}: ${timestamp - Number(msg.content.toString())}`);
}, { noAck: true });
});
}).catch((error) => { throw error; });
}).catch((error) => { throw error; });
这是制作人:
import amqp from 'amqplib';
amqp.connect('amqp://localhost').then((connection) => {
connection.createChannel().then((channel) => {
const queue = 'test1';
const totalMessages = 3;
channel.assertQueue(queue, { durable: false }).then(()=>{
for(var n = 0; n < totalMessages; n++){
channel.sendToQueue(queue, Buffer.from(new Date().getTime().toString()));
}
setTimeout(()=>{
connection.close();
process.exit(0);
}, 1000);
});
}).catch((error) => { throw error; });
}).catch((error) => { throw error; });
然后我用以下方法削弱了3个消费者实例:
for ((i=1;i<=3;i+=1)); do node dist/consumer.js & done
还有3个制作人:
for ((i=1;i<=3;i+=1)); do node dist/producer.js & done
我得到:
consumed 1: 8
consumed 1: 6
consumed 1: 10
consumed 2: 42
consumed 2: 43
consumed 3: 42
consumed 2: 42
consumed 3: 42
consumed 3: 42
每个生产者的第一个消息都具有较低的延迟,而其他生产者则没有。
有什么我可以做些改善的事情吗?
答案 0 :(得分:1)
尝试amqp.connect('amqp://localhost', { noDelay: true })
,可能需要Rabbitmq-server配置。详细信息,rabbitmq's Nagle Algorithm。