Messages in this thread | | | From | "pacman" <> | Subject | Re: [PATCH] HZ change for ix86 | Date | Mon, 11 Jan 1999 00:16:14 -0500 (EST) |
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Horvath Karoly writes the following: > >Why? Each of the N processes gets the 1/N of the CPU - wheter there are >long or short timeslices. If you have the CPU for long time, you'll miss >it for long time...
Not 1/N, but (1-overhead)/N, where the overhead is the CPU time being used to switch between the processes. The more you switch, the more time you spend executing _none_ of the N processes that are so eager to be executed.
>> > Why is that a problem? Here is an example: >> > You earn 1000$ a month. Your boss decides to pay you not monthly but weekly, >> > and you begin to complain that you earn only 250$.
You could complain that you now have to spend 4 times as much money on gasoline for driving to the bank to cash your paycheck 4 times as often. And if the lines at the bank are really long, you might wish your checks were scheduled less often, just like a CPU-hungry process wishes for long, infrequent timeslices.
-- Alan Curry
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