It looks like subprocess.Popen.poll() is the culprit. Calling it too
often (e.g. when idle) results in a very high CPU consumption.
** Changed in: software-center (Ubuntu)
Status: Confirmed => In Progress
** Changed in: software-center (Ubuntu)
Assignee: (unassigned) => Olivier Tilloy (osomon)
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Opening "Software Sources" through Ubuntu Software Center causes 100% CPU
https://bugs.launchpad.net/bugs/459521
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