This is such a nice tool. Here is handy one liner I use it all the time.
parallel -a input_file_here -j16 --gnu 'ssh -q {} "echo 'Matrix has you'"'
parallel -a input_file_here -j16 --gnu 'ssh -q {} "echo 'Matrix has you'"'
parallel --slf input_file_here -j16 --nonall echo 'Matrix has you'