For a scheme that is mostly independent of the time-per-iteration, and optimized for users: 

if ($lastPrintTime != time)
{
  $lastPrintTime = time;
  printf("Reticulating Splines: (%3d%%)\r", 100 * $loopIndex / $totalW
+ork);
}

[download]
That gets you a print only once per second (sometimes two seconds). Plenty often for humans, but almost never to the computer.

I'm usually lazier than that, and just slap on a cheap modulo conditional after seeing how long the loop iterations take:

printf("Evaluating Widgets: (%3d%%)\r", 100 * $loopIndex / $totalWork) unless ($loopIndex % 200);

In reply to Re^5: overwrite last line printed by SuicideJunkie
in thread overwrite last line printed by Commy_Code_Monkey

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