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authork0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-07-10 13:08:40 (GMT)
committerk0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-07-10 13:08:40 (GMT)
commit433af16167aec949c6345ad41b78b17c440b4a6d (patch)
tree42b9a14817cccef4a57177329381f97a7a2ac75c /benchmark/io_copy_stream_write_socket.rb
parentf992f4251874a025de09ffecf0f2b8cb984f2201 (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_socket.rb')
-rw-r--r--benchmark/io_copy_stream_write_socket.rb35
1 files changed, 35 insertions, 0 deletions
diff --git a/benchmark/io_copy_stream_write_socket.rb b/benchmark/io_copy_stream_write_socket.rb
new file mode 100644
index 0000000..11f369b
--- /dev/null
+++ b/benchmark/io_copy_stream_write_socket.rb
@@ -0,0 +1,35 @@
+# 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
+ require 'socket'
+ src = Zero.new
+ rd, wr = UNIXSocket.pair
+ pid = fork do
+ wr.close
+ buf = String.new
+ while rd.read(16384, buf)
+ end
+ end
+ rd.close
+ IO.copy_stream(src, wr)
+rescue Errno::ENOENT, NotImplementedError, NameError
+ # not *nix: missing /dev/zero, fork, or UNIXSocket
+rescue LoadError # no socket?
+ensure
+ wr.close if wr
+ Process.waitpid(pid) if pid
+end if IO.respond_to?(:copy_stream)