kombu 4.0 is slower than kombu 3.0.37 when pulish messaging

It’s my code:

    conn = Connection('amqp://admin:passw0rd@172.23.23.113')
    channel = conn.channel()
    exchange = Exchange('pengdong', 'direct', channel=channel, durable=True)
    producer = conn.Producer(channel=channel, exchange=exchange)
    while True:
        producer.publish("abc", routing_key="fang",delivery_mode=2)

when I run my code in kombu 4.0 ,I find the rate is only 80/s from the rabbitmq management site. But if I use the kombu 3.0.37 , I find the rate is up to 4000/s.

Why are there so huge difference between the two version of kombu ?

I use pyamqp as the amqplib in both case.

[ask]

   def publish(self, body, routing_key=None, delivery_mode=None,
                mandatory=False, immediate=False, priority=0,
                content_type=None, content_encoding=None, serializer=None,
                headers=None, compression=None, exchange=None, retry=False,
                retry_policy=None, declare=[], expiration=None, **properties):

It’s funny, because I have been arguing at work that it’s fine for grown ups to use mutable default arguments, then I walk right into this wall.

[ask]

Hah, I see what’s going on now…

The list of entities to declare is growing for every publish call 😃