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diff --git a/benchmark/vm_thread_pipe.yml b/benchmark/vm_thread_pipe.yml
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+prelude: |
+ # Measure small and plenty pipe read/write.
+ # A performance may depend on GVL implementation.
+benchmark:
+ vm_thread_pipe: |
+
+ lmax = 100_000
+ r, w = IO.pipe
+ [Thread.new{
+ lmax.times{
+ w.write('a')
+ }
+ p "w:exit"
+ }, Thread.new{
+ lmax.times{
+ r.read(1)
+ }
+ p "r:exit"
+ }].each{|t| t.join}
+loop_count: 1