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Is there a way, with Ruby, to prevent the CPU from going idle without blocking anything – Ebay API

I have a Ruby on Rails app. Ruby 2.3 Rails 3.2 The app uses resque which runs jobs asynchronously off a queue. One job, in particular, makes calls to an external (Ebay) api. While the api call is being made, the CPU of the ec2 instance doesn’t process anything. Is there a way to prevent the CPU from going idle during the api call?

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  1. Chosen as BEST ANSWER
    0

    Here's a solution I came up with which is working so far. I realize this question tends to offend peoples' sensibilities. But, perhaps with the caveat that this code should never actually be executed, I'd be interested to know of any potential shortcomings:

    module AppHelpers
  def self.prevent_idle_cpu
    uuid = SecureRandom.uuid
    cache_key = "/prevent_idle_cpu/#{uuid}"
    Rails.cache.write(cache_key, "busy", expires_in: 1.day)
    thread = Thread.new do
      while Rails.cache.read(cache_key).present?
        1_000_000.times { 13 * 13 }
      end
    end
    thread.priority = -1
    begin
      yield
    ensure
      Rails.cache.delete(cache_key)
    end
  end
end

AppHelpers.prevent_idle_cpu do
  api.make_call
end

  2. 0

    Is there a way, with Ruby, to prevent the CPU from going idle without
    blocking anything?

    Yes absolutely. In fact its trivial:

    require 'securerandom'
t = Thread.new do
  loop do
    print SecureRandom.alphanumeric(3)
    sleep 0.00001
  end
end

    This will just continue printing a Matrix screensaver indefinately without blocking until you call t.exit.

    But its most likely the wrong answer to the wrong question.

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