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-rw-r--r--benchmark/io_copy_stream_write.yml28
1 files changed, 28 insertions, 0 deletions
diff --git a/benchmark/io_copy_stream_write.yml b/benchmark/io_copy_stream_write.yml
new file mode 100644
index 0000000..32fa920
--- /dev/null
+++ b/benchmark/io_copy_stream_write.yml
@@ -0,0 +1,28 @@
+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: |
+
+ 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
+ src = Zero.new
+ dst = File.open(IO::NULL, 'wb')
+ n = IO.copy_stream(src, dst)
+ rescue Errno::ENOENT
+ # not *nix
+ end if IO.respond_to?(:copy_stream) && IO.const_defined?(:NULL)
+loop_count: 1