1. A global on-demand management apparatus for user control of a system resource on a grid computing system, the apparatus comprising: a global user input module configured to allow a user to input a parameter control request, the parameter control request corresponding to a performance parameter of the grid computing system; a global parameter module configured to dynamically change the performance parameter according to the parameter control request, the performance parameter corresponding to a performance resource; and a global reservation module configured to reserve the performance resource for a grid computing operation.