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diff --git a/benchmark/io_select3.yml b/benchmark/io_select3.yml
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+prelude: |
+ # IO.select performance. a lot of fd
+benchmark:
+ io_select3: |
+
+ ios = []
+ nr = 100
+ 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 - 10).times do
+ r, w = IO.pipe
+ r.close
+ ios.push w
+ end
+
+ nr.times do
+ IO.select nil, ios
+ end
+loop_count: 1