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author | k0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-07-10 13:08:40 +0000 |
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committer | k0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-07-10 13:08:40 +0000 |
commit | 433af16167aec949c6345ad41b78b17c440b4a6d (patch) | |
tree | 42b9a14817cccef4a57177329381f97a7a2ac75c /benchmark/io_copy_stream_write.rb | |
parent | f992f4251874a025de09ffecf0f2b8cb984f2201 (diff) |
benchmark: drop all bm_ prefix for legacy driver.rb
benchmark/*.rb is only benchmarks now. We don't need prefixes.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'benchmark/io_copy_stream_write.rb')
-rw-r--r-- | benchmark/io_copy_stream_write.rb | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/benchmark/io_copy_stream_write.rb b/benchmark/io_copy_stream_write.rb new file mode 100644 index 0000000000..3fd87250a4 --- /dev/null +++ b/benchmark/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) |