03-06-2013
Quote:
Originally Posted by
DGPickett
In a more perfect world, the dispatcher would get the CPU to programs that do not hog it and that do i/o on an expedited basis.
I believe many schedulers do; I've always been impressed by how well UNIX in general timeshares, compared to Windows' nonstop stuttering. (Not even quad cores helps.) But it only works when they're equal priority... High priority will be favored over low priority regardless of how polite they are. That's what priority's for.
A runaway higher-priority process can lock lower-priority ones out quite harshly; users with the ability to raise their priority can badly affect other users. Starting them at maximum relative to each other prevents them from stalling each other.
Last edited by Corona688; 03-06-2013 at 05:47 PM..
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nice(3) Library Functions Manual nice(3)
Name
nice - set program priority
Syntax
int nice(incr)
int incr;
Description
The scheduling priority of the process is augmented by incr. Positive priorities get less service than normal. Priority 10 is recommended
to users who wish to execute long-running programs without flack from the administration.
Negative increments are ignored except on behalf of the super-user. The priority is limited to the range -20 (most urgent) to 20 (least).
The priority of a process is passed to a child process by For a privileged process to return to normal priority from an unknown state,
should be called successively with arguments -40 (goes to priority -20 because of truncation), 20 (to get to 0), then 0 (to maintain com-
patibility with previous versions of this call).
Environment
In any mode, nice returns -1 and sets on an error. On success, the return value depends on the mode in which your program was compiled.
In POSIX or System V mode, it is the new priority; otherwise, it is zero. Note that, in POSIX and System V mode, -1 can indicate either
success or failure; must be used to determine which.
See Also
nice(1), fork(2), setpriority(2), renice(8)
nice(3)