From: nobu@...
Date: 2015-04-11T01:48:19+00:00
Subject: [ruby-core:68835] [Ruby trunk - Feature #11024] [PATCH] connect_nonblock supports "exception: false"

Issue #11024 has been updated by Nobuyoshi Nakada.

Description updated

Seems working fine, but my results don't look better, on Ubuntu 14.10
on VirtualBox on OS X.

nr = 5000        |      user |    system |     total |       real
-----------------|----------:|----------:|----------:|-----------:
default          |  0.000000 |  0.290000 |  0.290000 |(  0.291610)
exception: false |  0.000000 |  0.210000 |  0.210000 |(  0.218066)

nr = 50000       |      user |    system |     total |       real
-----------------|----------:|----------:|----------:|-----------:
default          |  0.010000 |  2.840000 |  2.850000 |(  4.859450)
exception: false |  0.020000 |  2.340000 |  2.360000 |(  7.369629)


----------------------------------------
Feature #11024: [PATCH] connect_nonblock supports "exception: false"
https://bugs.ruby-lang.org/issues/11024#change-52099

* Author: Eric Wong
* Status: Open
* Priority: Normal
* Assignee: Nobuyoshi Nakada
----------------------------------------
This is for consistency with accept_nonblock arguments and gives a
minor speedup from avoiding exceptions:

Results:

                 |      user |    system |     total |       real
-----------------|----------:|----------:|----------:|-----------:
default          |  0.050000 |  0.100000 |  0.150000 |(  0.151307)
exception: false |  0.030000 |  0.080000 |  0.110000 |(  0.108840)

---------------------------------------------------
~~~ruby
require 'socket'
require 'benchmark'
require 'io/wait'
require 'tmpdir'

host = "127.#{rand 255}.#{rand 255}.#{rand(254) + 1}"

serv = TCPServer.new(host, 0)

nr = 5000

addr = serv.getsockname
pid = fork do
  begin
    serv.accept.close
  rescue => e
    warn "#$$: #{e.message} (#{e.class})"
  end while true
end
at_exit { Process.kill(:TERM, pid) }
serv.close

Benchmark.bmbm do |x|
  x.report("default") do
    nr.times do
      s = Socket.new(:INET, :STREAM)
      s.setsockopt(:SOL_SOCKET, :SO_REUSEADDR, 1)
      begin
        s.connect_nonblock(addr)
      rescue IO::WaitWritable
        s.wait_writable
      end
      s.close
    end
  end
  x.report("exception: false") do
    nr.times do
      s = Socket.new(:INET, :STREAM)
      s.setsockopt(:SOL_SOCKET, :SO_REUSEADDR, 1)
      case s.connect_nonblock(addr, exception: false)
      when :wait_writable
        s.wait_writable
      end
      s.close
    end
  end
end
~~~


---Files--------------------------------
0001-connect_nonblock-supports-exception-false.patch (9.14 KB)


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