As stated in the post itslef, just use GNU parallel: "But wait, what about GNU parallel? Actually, it turns out that GNU parallel does give us this capability.

As stated in the post itslef, just use GNU parallel: "But wait, what about GNU parallel? Actually, it turns out that GNU parallel does give us this capability. It supports sending lines of input to commands over stdin with its --pipe argument and sending multiple lines to the same task with its --round-robin argument. And it doesn't have a 4096-byte-long line limit, and you don't need to worry about wrapping your workers with pad and unpad. So, you should probably just use GNU parallel. :)"