Date: Sat, 22 Dec 2007 19:09:47 -0800 (PST) From: Unga <unga888@yahoo.com> To: freebsd-questions@freebsd.org Subject: Understand process priority Message-ID: <514379.74969.qm@web57011.mail.re3.yahoo.com>
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Hi all
$ ps -o pri,ni,rtprio,command -p `pgrep amarok`
PRI NI RTPRIO COMMAND
20 0 normal amarokapp
1) Are there are 3 priority values per process, or
just one?
2) How should I read above? Is it Priority=20, ie.
NI=0, RTPRIO=normal? Does it all mean the same thing,
like the bytes=1048576 and KB=1024 and MB=1?
3) The rtprio(1) says "Priority is an integer between
0 and RTP_PRIO_MAX (usually 31). 0 is the highest
priority". But when I run following command:
$ ps aux -o pri,ni,rtprio,command
USER PID %CPU %MEM VSZ RSS TT STAT STARTED
TIME COMMAND PRI NI RTPRIO COMMAND
root 10 99.2 0.0 0 8 ?? RL 7:40PM
0:00.00 [idle: cpu1] 171 0 idle:25 [idle: cpu1]
root 26 0.0 0.0 0 8 ?? WL 7:40PM
0:00.02 [irq18: envy24ht -80 0 intr:4 [irq18:
envy24ht
test 1212 0.0 9.3 58544 48176 ?? S 8:06PM
0:06.15 amarokapp 20 0 normal amarokapp
That is,
PID PRI NI RTPRIO
10 171 0 idle:25
26 -80 0 intr:4
1212 20 0 normal
This shows priority ranges at least from -80 to 171
contrary to the range mentioned in rtprio(1). Does
this means PID=26 has a higher priority than PID=1212?
4) Can a PRI=0 be considered Realtime?
5) What is the meaning of priority=0 in
/etc/login.conf? Is it Realtime?
6) What is the value should I set for priority in
/etc/login.conf if I want Realtime?
Kind Regards
Unga
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