1 files changed, 25 insertions, 0 deletions
diff --git a/benchmark/io_select2.yml b/benchmark/io_select2.yml
new file mode 100644
index 0000000000..3c8078dc11
--- /dev/null
+++ b/benchmark/io_select2.yml
@@ -0,0 +1,25 @@
+prelude: |
+  # IO.select performance. worst case of single fd.
+benchmark:
+  io_select2: |
+
+    ios = []
+    nr = 1000000
+    if defined?(Process::RLIMIT_NOFILE)
+      max = Process.getrlimit(Process::RLIMIT_NOFILE)[0]
+    else
+      max = 64
+    end
+    puts "max fd: #{max} (results not apparent with <= 1024 max fd)"
+
+    ((max / 2) - 10).times do
+      ios.concat IO.pipe
+    end
+
+    last = [ ios[-1] ]
+    puts "last IO: #{last[0].inspect}"
+
+    nr.times do
+      IO.select nil, last
+    end
+loop_count: 1