normal	2017-01-19 03:23:49 +0900 (Thu, 19 Jan 2017)

  New Revision: 57364

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57364

  Log:
    another benchmark for IO.copy_stream socket writing
    
    For testing Linux socket-only workaround for
    https://bugs.ruby-lang.org/issues/13085

  Added files:
    trunk/benchmark/bm_io_copy_stream_write_socket.rb
Index: benchmark/bm_io_copy_stream_write_socket.rb
===================================================================
--- benchmark/bm_io_copy_stream_write_socket.rb	(revision 0)
+++ benchmark/bm_io_copy_stream_write_socket.rb	(revision 57364)
@@ -0,0 +1,35 @@ https://github.com/ruby/ruby/blob/trunk/benchmark/bm_io_copy_stream_write_socket.rb#L1
+# The goal of this is to use a synthetic (non-IO) reader
+# to trigger the read/write loop of IO.copy_stream,
+# bypassing in-kernel mechanisms like sendfile for zero copy,
+# so we wrap the /dev/zero IO object:
+class Zero
+  def initialize
+    @n = 100000
+    @in = File.open('/dev/zero', 'rb')
+  end
+
+  def read(len, buf)
+    return if (@n -= 1) == 0
+    @in.read(len, buf)
+  end
+end
+
+begin
+  require 'socket'
+  src = Zero.new
+  rd, wr = UNIXSocket.pair
+  pid = fork do
+    wr.close
+    buf = String.new
+    while rd.read(16384, buf)
+    end
+  end
+  rd.close
+  IO.copy_stream(src, wr)
+rescue Errno::ENOENT, NotImplementedError, NameError
+  # not *nix: missing /dev/zero, fork, or UNIXSocket
+rescue LoadError # no socket?
+ensure
+  wr.close if wr
+  Process.waitpid(pid) if pid
+end if IO.respond_to?(:copy_stream)

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