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#! perl -slw
use Cwd;
...
    }
    print( "Ending thread" );
}

Waiting to spawn processes.
The submitters will run 4 times. The steps are:
...
A thread joined
Processes ended - Goodbye
timethis 4: 14 wallclock secs ( 1.28 usr +  0.06 sys =  1.34 CPU) @  2
+.98/s (n=4)