zanker

started_at = Time.now.to_f # 00:00
# Context switch to another thread
# 00:05, Context switch back 5 seconds later
response = HTTP.post("/users/create") # 00:06
report_time("users.create", (Time.now.to_f - started_at) * 1000) # 00:06

zanker

started_at = Time.now.to_f
response = HTTP.post("/users/create")
report_time("users.create", (Time.now.to_f - started_at) * 1000)
response

zanker

Thread.new do
 started_at = Time.now.to_f
 sleep 1
 report_time("thread.contention", (Time.now.to_f - started_at - 1) * 1000)
end

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# Thread 1
total = 0
loop do
  total = total + 1
end

# Thread 2
response = HTTP.post("/users/create")
data = JSON.parse(response.body)
HTTP.post("/update-profile/#data['user_id']}")

zanker

def <<(work)
  @mutex.synchronize do
    if @shutdown
      raise "Unable to add work while shutting down"
    end

    @todo << work

    if @waiting < @todo.size and @spawned < @max
      spawn_thread

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if io = sock.accept_nonblock
  client = Client.new io, @binder.env(sock)
  if remote_addr_value
    client.peerip = remote_addr_value
  elsif remote_addr_header
    client.remote_addr_header = remote_addr_header
  end

  pool << client
  pool.wait_until_not_full unless queue_requests

zanker

require 'http'

started_at = Time.now
threads = 10.times.map do |i|
  sleep 0.1

  Thread.new do
    begin
      started_at = Time.now
      response = HTTP.get("http://localhost:8001/#{i}")

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daemon off;

worker_processes 1;

error_log /dev/stdout debug;
pid /tmp/nginx.pid;

events {
    worker_connections 8192;
}

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Measure Mode: wall_time
Thread ID: 70262938909220
Fiber ID: 70262945578140
Total Time: 12.474074363708496
Sort by: total_time

  %total   %self      total       self       wait      child            calls    Name
--------------------------------------------------------------------------------
 100.00%   0.00%     12.474      0.000      0.000     12.474                1      Global#[No method]
                     12.474      0.002      0.000     12.472              1/1      Integer#times

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Measure Mode: wall_time
Thread ID: 70319499115040
Fiber ID: 70319529395800
Total Time: 1.1018621921539307
Sort by: total_time

  %total   %self      total       self       wait      child            calls    Name
--------------------------------------------------------------------------------
 100.00%   0.00%      1.102      0.000      0.000      1.102                1      Global#[No method]
                      1.102      0.001      0.000      1.100              1/1      Integer#times