07-14-2009
Jim is absolutely correct. Additionally keep in mind that priorities are relative numbers. There are only so many CPU ticks to distribute among processes and if every process has a high priority then every one might get the same amount as if every process has a low priority, as far as these priorities are equal.
I hope this helps.
bakunin
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LEARN ABOUT DEBIAN
rtprio
RTPRIO(2) BSD System Calls Manual RTPRIO(2)
NAME
rtprio -- examine or modify a process realtime or idle priority
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/rtprio.h>
int
rtprio(int function, pid_t pid, struct rtprio *rtp);
DESCRIPTION
The rtprio() system call is used to lookup or change the realtime or idle priority of a process.
The function argument specifies the operation to be performed. RTP_LOOKUP to lookup the current priority, and RTP_SET to set the priority.
The pid argument specifies the process to be used, 0 for the current process.
The *rtp argument is a pointer to a struct rtprio which is used to specify the priority and priority type. This structure has the following
form:
struct rtprio {
u_short type;
u_short prio;
};
The value of the type field may be RTP_PRIO_REALTIME for realtime priorities, RTP_PRIO_NORMAL for normal priorities, and RTP_PRIO_IDLE for
idle priorities. The priority specified by the prio field ranges between 0 and RTP_PRIO_MAX (usually 31). 0 is the highest possible prior-
ity.
Realtime and idle priority is inherited through fork() and exec().
A realtime process can only be preempted by a process of equal or higher priority, or by an interrupt; idle priority processes will run only
when no other real/normal priority process is runnable. Higher real/idle priority processes preempt lower real/idle priority processes.
Processes of equal real/idle priority are run round-robin.
RETURN VALUES
The rtprio() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The rtprio() system call will fail if
[EINVAL] The specified prio was out of range.
[EPERM] The calling process is not allowed to set the realtime priority. Only root is allowed to change the realtime priority of
any process, and non-root may only change the idle priority of the current process.
[ESRCH] The specified process was not found.
SEE ALSO
nice(1), ps(1), rtprio(1), setpriority(2), nice(3), renice(8)
AUTHORS
The original author was Henrik Vestergaard Draboel <hvd@terry.ping.dk>. This implementation in FreeBSD was substantially rewritten by David
Greenman.
BSD
July 23, 1994 BSD