为什么 EC2 服务器上的多个 Ruby 进程会导致 100% 的 CPU 使用率？

Question

I have a Rails application which has 100% CPU utilization most of the time. I am not able to figure out why there is so much load on the server. I am using the Puma web server with a default configuration, and am running multiple background jobs using the sucker-punch gem. There are 7 files which are using sucker punch jobs with 5 workers:

include SuckerPunch::Job 
workers 5

I ran the top -i query and found the following processes running on the server. I can see multiple Ruby commands on the server. Can someone tell me whether this is normal behavior on a server, or if something is wrong?

Answer 1

Some Ways to Reduce Resource Contention

Your user space load is high (~48%), so you'll probably want to reduce the number of workers in your web application, increase the number of CPUs available on your instance, move to a version of Ruby that has better concurrency and real multi-core support (eg Rubinius or JRuby), or some combination of these options. Depending on what your code is actually doing, you may also need to re-architect your application to offload expensive I/O from the application server.

In addition, your steal time is quite high (~41%), so your EC2 instance is probably overloaded. Simply moving your application to a less-loaded instance may free up sufficient resources to reduce application wait times.