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while ( my @ready = $select->can_read()) { 
  ...
};

sleep 2; # give time to child process
while ( my @ready = $select->can_read()) { 
  ...
};

my @children = get_child_pids(); # fake
while (@children) {
...
  @children = get_child_pids(); # fake
  sleep 5; # let's see if the remaining children will produce output
};