If you want a script to run periodically, this is always
a call for cron, the program that starts tasks
under the several variants of Unix.
Then you can do away with the while(1){} loop
and let your program run just once every 5 minutes.
If you are working under Win32, there is either the
dreaded Scheduler service under Windows 9x (avoid it,
it needs a person logged in), or the at service
under NT, which has a different syntax but does what
cron does under Unix.
Much more interesting though is, why your Perl program
racks up that much CPU time at all, but I'm at a loss here.
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