What will keep a system from sleeping, other than user activity?

If I'm, say, running a long video transcode, will that prevent automatic sleep, or might sleep kick in anyway in the middle of things and possibly screw them up? I think this may have happened, so I'm considering disabling automatic sleep if it presents this sort of liability. TIA... Mark

Programs actively writing to disk should keep a system from sleeping. That said, I've always turned off sleep on my systems when doing important processing, just to be sure. Some software can pause for significant amounts of time and while they should still be keeping the processor working and so prevent sleep, it's not foolproof, so I err on the side of caution and set my systems not to sleep other than the monitor when they're going to be processing for a while.
Regards.

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What will keep a system from sleeping, other than user activity?

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