How does OS X determine the idle time to enter sleep mode?

Is it based on no keyboard/mouse activity? Or based on CPU load level? For example, if I run a long program, will the computer go into sleep mode if I don't use the keyboard and mouse?

Thanks. Maybe I did not clearly state my question.
I understand that sleep mode is determined by a set time interval and it can be independtly set for computer and display. My question is regarding the method for determining the set time interval.
Does the set time interval start when I don't use the keyboard/mouse? If I run some applications and provide CPU load to the system, does it still go into sleep mode after the set time interval and stop the applications if I don't use keyboard/mouse?
Thanks.

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