You never answered my first question.
Why are you creating & closing oracle connections? Unless there is some special reason to do that (aka, tasks running as different oracle users), don't do that. Creating & destroying oracle connections so often is where your load jump is coming from.
You should switch your model from:
foreach $task (@tasks) { fork/connect/execute/disconnect/exit }
To:
for($i = 0; $i < $numchilds; $i++) {fork; connect; while (get_task) {
+run_task}; disconnect; exit;}
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