in reply to Re: Using perl to speed up a series of bash commands by transforming them into a single command that will run everything in parallel.
in thread Using perl to speed up a series of bash commands by transforming them into a single command that will run everything in parallel.

Or using some handy module... 
use Proc::Queue qw(system_back all_exit_ok),
                size => 8;  # this ensures that, at most, 8
                            # child processes run at any time

my @pids = map { system_back $_ } @commands;

all_exit_ok(@pids)
  or warn "some processes failed\n";

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