normal	2017-05-04 11:13:11 +0900 (Thu, 04 May 2017)

  New Revision: 58556

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58556

  Log:
    benchmark: new single-threaded read/write benchmark with pipe
    
    This is currently for testing GVL performance in the uncontended
    case: IO#write and IO#read unconditionally release GVL for
    blocking I/O with pipe.
    
    It will also be interesting to see how this changes if we switch
    to M:N threading model.

  Added files:
    trunk/benchmark/bm_io_pipe_rw.rb
Index: benchmark/bm_io_pipe_rw.rb
===================================================================
--- benchmark/bm_io_pipe_rw.rb	(nonexistent)
+++ benchmark/bm_io_pipe_rw.rb	(revision 58556)
@@ -0,0 +1,13 @@ https://github.com/ruby/ruby/blob/trunk/benchmark/bm_io_pipe_rw.rb#L1
+# Measure uncontended GVL performance via read/write with 1:1 threading
+# If we switch to M:N threading, this will benchmark something else...
+r, w = IO.pipe
+src = '0'.freeze
+dst = String.new
+i = 0
+while i < 1_000_000
+  i += 1
+  w.write(src)
+  r.read(1, dst)
+end
+w.close
+r.close

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