Increasing Thread Priority

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Does increasing the priority of a thread cause it to finish it's work faster?

Posted 3-Jun-11 9:19am

d.allen101

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OriginalGriff · Answer 1 · 2011-06-03T09:31:00

Maybe. Maybe not.

It won't make it run any slower, but that's about all you can say!

Why not? Here are a few reasons:
1) Have a look at your PC's Task Manager, and select the "Processes" Tab. Click on CPU to sort the display by decreasing CPU usage. What process is right at the top, with 98 or 99 percent of your CPU? "System Idle Process" - i.e. the task that only ever gets a go when there is nothing else to do at all! Increasing your thread priority won't give you more CPU if you are the only process using it anyway!
2) Your thread may have very little actual CPU processing to do anyway: you could be mostly waiting for disk access, other processes, external databases, etc., etc.. Changing your priority will not affect these in the least!

On balance, the answer is "probably not", but it may be worth your experimenting to find out if it does in your specific case.

#realJSOP · Answer 2 · 2011-06-03T09:55:00

Solution 2

To add to Griff's answer, you should avoid doing it. If you increase the priority on your thread, it steals time slices from all other running threads, and you could upset other (unseen) application apple carts in the process...

Posted 3-Jun-11 9:55am

#realJSOP

Comments

Sergey Alexandrovich Kryukov 3-Jun-11 20:32pm

Agree! My 5.
--SA

Kim Togo 4-Jun-11 2:48am

Really good point. My 5.