Cpu limit

[deanrather]

Adds support for an optional cpu_limit option on applications defined in the environment.config.js file.

eg:

// environment.config.json
module.exports = {
  apps: [{
      script: './heavy-service.sh',
      args: ['--port=1111', '--name=service1'],
      cpu_limit: 1
    },
    {
      script: './heavy-service.sh',
      args: ['--port=2222', '--name=service2'],
      cpu_limit: 1
    },
    {
      script: './heavy-service.sh',
      args: ['--port=3333', '--name=service3'],
      cpu_limit: 1
    },
    {
      script: './heavy-service.sh',
      args: ['--port=4444', '--name=service4'],
      cpu_limit: 10
    }, {
      script: './heavy-service.sh',
      args: ['--port=5555', '--name=service5'],
      cpu_limit: 10
    }
  ]
};

#!/bin/bash
# heavy-service.sh

example_arg1=$1
example_arg2=$2

# this will use up all available CPU

while true; do
  echo "heavy-service running with example_arg1: $example_arg1, example_arg2: $example_arg2"
  # sleep 0.000001
done

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets
License	MIT
Doc PR	https://github.com/pm2-hive/pm2-hive.github.io/pulls

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[Unitech]

good PR idea
We've noticed that since Node 10.10 there is os.{get,set}Priority nodejs/node#22407
It would be better to leverage this API instead