PID 28907
Forked worker in slot 2 with pid 28910 for chunk 1
Forked worker in slot 1 with pid 28909 for chunk 2
After 1: $VAR1 = {
          '00 28910' => '1491580974',
          '01 28909' => '1491580974'
        };

After 0: $VAR1 = {
          '00 28910' => '1491580974',
          '01 28909' => '1491580974'
        };

Forked worker in slot 1 with pid 28909 for chunk 3
Forked worker in slot 2 with pid 28910 for chunk 4
After 2: $VAR1 = {
          '00 28910' => '1491580974',
          '01 28909' => '1491580974',
          '02 28909' => '1491580975'
        };

After 3: $VAR1 = {
          '00 28910' => '1491580974',
          '01 28909' => '1491580974',
          '02 28909' => '1491580975',
          '03 28910' => '1491580975'
        };

^CHello from INT
Hello from INT
Hello from INT