1 files changed, 17 insertions, 0 deletions
diff --git a/benchmark/bm_io_select3.rb b/benchmark/bm_io_select3.rb
new file mode 100644
index 0000000000..fcdbb96e0e
--- /dev/null
+++ b/benchmark/bm_io_select3.rb
@@ -0,0 +1,17 @@
+# IO.select performance. a lot of fd
+
+ios = []
+nr = 100
+max = Process.getrlimit(Process::RLIMIT_NOFILE)[0]
+puts "max fd: #{max} (results not apparent with <= 1024 max fd)"
+
+(max - 10).times do
+  r, w = IO.pipe
+  r.close
+  ios.push w
+end
+
+nr.times do
+  IO.select nil, ios
+end
+