diff options
author | normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-12-31 00:41:14 +0000 |
---|---|---|
committer | normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-12-31 00:41:14 +0000 |
commit | f01d3b23341b0d961e8ff2c005ad8f829b9fddf6 (patch) | |
tree | fe02fc2da1883f79d9a39fec785158b7574b6598 /benchmark/bm_io_copy_stream_write.rb | |
parent | 994d13b98f5ef03a43a9ca9adc76490bc8ec6426 (diff) | |
download | ruby-f01d3b23341b0d961e8ff2c005ad8f829b9fddf6.tar.gz |
add benchmark for IO.copy_stream IO#write case
I will attempt to reduce garbage in proposed fix
for https://bugs.ruby-lang.org/issues/13085
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57237 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'benchmark/bm_io_copy_stream_write.rb')
-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) |