Class: Benchmark::HTTP::Command::Concurrency

Inherits:
Samovar::Command
  • Object
show all
Defined in:
lib/benchmark/http/command/concurrency.rb

Instance Method Summary collapse

Instance Method Details

#call ⇒ Object 



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# File 'lib/benchmark/http/command/concurrency.rb', line 106

def call
  @hosts.each do |host|
    run(host)
  end
end

#confidence_factor ⇒ Object 



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# File 'lib/benchmark/http/command/concurrency.rb', line 29

def confidence_factor
  1.0 - @options[:confidence]
end

#measure_performance(concurrency, endpoint, request_path) ⇒ Object 



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# File 'lib/benchmark/http/command/concurrency.rb', line 33

def measure_performance(concurrency, endpoint, request_path)
  Console.logger.info(self, url: endpoint.url) {"I am running #{concurrency} asynchronous tasks that will each make sequential requests..."}
  
  statistics = Statistics.new(concurrency)
  task = Async::Task.current
  
  concurrency.times.map do
    task.async do
      client = Async::HTTP::Client.new(endpoint, protocol: endpoint.protocol)
      
      statistics.sample(confidence_factor) do
        response = client.get(request_path).tap(&:finish)
      end
      
      client.close
    end
  end.each(&:wait)
  
  Console.logger.info(self, url: endpoint.url, concurrency: concurrency, statistics: statistics) do |buffer|
    buffer.puts "I made #{statistics.count} requests in #{Seconds[statistics.sequential_duration]}. The per-request latency was #{Seconds[statistics.latency]}. That's #{statistics.per_second.round(2)} asynchronous requests/second."
  
    buffer.puts "\t          Variance: #{Seconds[statistics.variance]}"
    buffer.puts "\tStandard Deviation: #{Seconds[statistics.standard_deviation]}"
    buffer.puts "\t    Standard Error: #{statistics.standard_error}"
  end
  
  return statistics
end

#run(url) ⇒ Object 



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# File 'lib/benchmark/http/command/concurrency.rb', line 62

def run(url)
  endpoint = Async::HTTP::Endpoint.parse(url)
  request_path = endpoint.url.request_uri
  
  Console.logger.info(self) {"I am going to benchmark #{url}..."}
  
  Sync do |task|
    statistics = []
    minimum = @options[:minimum]
    
    base = measure_performance(minimum, endpoint, request_path)
    statistics << base
    
    current = minimum * 2
    maximum = nil
    
    while statistics.last.concurrency < current
      results = measure_performance(current, endpoint, request_path)
      
      if base.similar?(results, @options[:threshold])
        statistics << results
        
        minimum = current
        
        if maximum
          current += (maximum - current) / 2
        else
          current *= 2
        end
      else
        # current concurrency is too big, so we limit maximum to it.
        maximum = current
        
        current = (minimum + (maximum - minimum) / 2).floor
      end
    end
    
    Console.logger.info(self) do |buffer|
      buffer.puts "Your server can handle #{statistics.last.concurrency} concurrent requests."
      buffer.puts "At this level of concurrency, requests have ~#{(statistics.last.latency / statistics.first.latency).round(2)}x higher latency."
    end
  end
end