Processing issue

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http://forums.fedoraforum.org – hi all i am new to the whole Linux thing, but at work we had to convert from windows to linux as our processing and memory requirements exceeded that of the windows. i am currently using Intel quad core processor on fedora 11 with 64 GB of ram. my problem is during running a simulation model, the system shows that it uses only one core for a while then swaps the process for another core after that. so my question is is there a way to force the system to use all four cores at once cause this will reduce the calculation time for me big time :) . thank you all for your time, walid tawfik pps: the software which i am currently using for the model is a java based software. (HowTos)