mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
433af16167
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
24 lines
570 B
Ruby
24 lines
570 B
Ruby
# 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)
|