How to debug Daphne CPU 100% issue

Hi, 

Could you please give some suggestions to inspect the high CPU (most time above 90% and some time above 100%) consumed by Daphne. 

Environment:

• OS: Ubuntu 18.04.1 LTS x86_64 GNU/Linux
• Django: 2.1.1
• Daphne: 2.3.0
• Channels: 2.2.0
• channels-redis: 2.4.0

Just use the Daphne as the websocket server with redis as the Channel layer. 

Now I do the following steps:

1. top command show the daphne process consume high cpu
2. check the thread numbers with ps -o thcount 22549, which shows 40. 
3. check the websocket connected numbers with redis cli: ZCOUNT asgi::group:USER_MESSAGE -inf +inf, which shows 190
4. check the system call with sudo strace -c -p 22549 for a minute, the result as the following:

Best Wishes.

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