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 119

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

#confidence_factor ⇒ Object 



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# File 'lib/benchmark/http/command/concurrency.rb', line 44

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 48

def measure_performance(concurrency, endpoint, request_path)
	puts
	puts "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, endpoint.protocol)
			
			statistics.sample(confidence_factor) do
				response = client.get(request_path).tap(&:finish)
			end
			
			client.close
		end
	end.each(&:wait)
	
	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."
	
	puts "\t          Variance: #{Seconds[statistics.variance]}"
	puts "\tStandard Deviation: #{Seconds[statistics.standard_deviation]}"
	puts "\t    Standard Error: #{statistics.standard_error}"
	
	return statistics
end

#run(url) ⇒ Object 



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# File 'lib/benchmark/http/command/concurrency.rb', line 76

def run(url)
	endpoint = Async::HTTP::Endpoint.parse(url)
	request_path = endpoint.url.request_uri
	
	puts "I am going to benchmark #{url}..."
	
	Async::Reactor.run 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
		
		puts "Your server can handle #{statistics.last.concurrency} concurrent requests."
		
		puts "At this level of concurrency, requests have ~#{(statistics.last.latency / statistics.first.latency).round(2)}x higher latency."
	end
end