diff options
| -rw-r--r-- | benchmark/bm_io_copy_stream_write.rb | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/benchmark/bm_io_copy_stream_write.rb b/benchmark/bm_io_copy_stream_write.rb new file mode 100644 index 0000000000..3fd87250a4 --- /dev/null +++ b/benchmark/bm_io_copy_stream_write.rb @@ -0,0 +1,24 @@ +# 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 + 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) |