Running bash script with php under lower priority or limit CPU

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http://serverfault.com – I have a bash script which runs a set of php scripts. When it runs it takes an hour and pegs the CPU at 95-99%. This causes our lamp stack (mainly the apache process) problems and our website on the same server starts spitting out timeout or 500 errors. How can I either: Run the bash script and all associated tasks (php scripts which also call the PostgreSQL db) at a low priority so apache, php and db tasks for the web server are always prioritized, OR Limit the CPU usage for the script and associated tasks to, e.g. 25% CPU I'm not sure which is the better solution. Thanks! (HowTos)