[pona-a]

As a non-system-programmer, here's my attempt in Odin.

  yes | pv > /dev/null
  0:00:15 [1.12GiB/s]
  build/yes | pv > /dev/null
  0:00:20 [1.03GiB/s]


  package main
  
  import "core:sys/linux"
  import "core:os"
  import "core:strings"
  
  main :: proc() {
    msg := "y" if len(os.args) == 1 else os.args[1]
    msg = strings.concatenate({msg, "\n"})
  
    buf := transmute([]u8) strings.repeat(msg, 8192)
    for {
      linux.write(linux.STDOUT_FILENO, buf)
    }
  }