I used to use GNU parallel for automating some server management tasks (this was circa 2009). For long-running or (typical) non-interactive tasks, it's fine, bu

I used to use GNU parallel for automating some server management tasks (this was circa 2009). For long-running or (typical) non-interactive tasks, it's fine, but if you're waiting to see output from running something that should be really quick, the startup time is (or was) frustratingly long. I ended up writing my own parallel execution code in shell, and it was much, much faster.