[ubuntu] interfering processes

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http://ubuntuforums.org – I am running an application which is very timing sensitive, and which has to be ran for quite a time just for precise [average] values to be determined. But, as I am aware of, there are interfering processes here and there in the background, which jobs are to enrich the experience of the user -- such as update notifications (happens once a day), backup-management reminders (happens once in a while), and screen-locking automatisms (default is set to 10 minutes). The question I am asking is, is there any practical way to "stop time," so as to speak, and make every such processes (Hardware)