PHP's AMQP extension set causes memory overflow

Recently done a project need to use RABBITMQ, according to their own previous article to install the test, are OK, but the actual use of the process found a lot of problems;

The scenario is this:

I built 10 queues, wrote a loop, the purpose is to write 30,000 data to each queue, the result is a test of n times, the program is written to the fourth queue, it was killed; after the top command, monitoring memory, the program in the process of execution, the CPU utilization reached more than 70%, PHP process memory can reach more than 2800M, and then the PHP process disappears, CPU (to be continued)

PHP's AMQP extension set causes memory overflow