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-rw-r--r--benchmark/io_copy_stream_write_socket.yml39
1 files changed, 39 insertions, 0 deletions
diff --git a/benchmark/io_copy_stream_write_socket.yml b/benchmark/io_copy_stream_write_socket.yml
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--- /dev/null
+++ b/benchmark/io_copy_stream_write_socket.yml
@@ -0,0 +1,39 @@
+prelude: |
+ # 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:
+benchmark:
+ io_copy_stream_write_socket: |
+ 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)
+loop_count: 1