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

#confidence_factor ⇒ Object 



43
44
45
 
# File 'lib/benchmark/http/command/concurrency.rb', line 43

def confidence_factor
  1.0 - @options[:confidence]
end

#invoke(parent) ⇒ Object 



116
117
118
119
120
 
# File 'lib/benchmark/http/command/concurrency.rb', line 116

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

#measure_performance(concurrency, endpoint, request_path) ⇒ Object 



47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
 
# File 'lib/benchmark/http/command/concurrency.rb', line 47

def measure_performance(concurrency, endpoint, request_path)
  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} 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 



73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
 
# File 'lib/benchmark/http/command/concurrency.rb', line 73

def run(url)
  endpoint = Async::HTTP::URLEndpoint.parse(url)
  request_path = endpoint.url.request_uri
  
  puts "I am going to benchmark #{url}..."
  
  Async::Reactor.run do |task|
    statistics = []
    minimum = 1
    
    base = measure_performance(minimum, endpoint, request_path)
    statistics << base
    
    current = 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