[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

Conference noted::perf-advisor-osf

Title:POLYCENTER Performance Advisor for Digital UNIX
Moderator:PECSYS::BHAT
Created:Fri Feb 17 1995
Last Modified:Mon Jun 02 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:262
Total number of notes:856

227.0. "Nice time" by NETRIX::"euan@hhl.dec.com" (Euan McMaster) Thu Oct 03 1996 15:04

T.RTitleUserPersonal
Name
DateLines
227.1nice time is low-priority usermode timeMSE1::CAMPBELLKen W - MSE TAY2-1/H14 227-3203Tue Feb 25 1997 19:0217
    CPU nice time is a measure of the time the CPU(s) spend
    running processes in usermode and the process's priority has
    been lowered below its base priority. (see hardclock() in
    kern_clock.c).
    
    When you're not looking at cpd files:
    - vmstat combines user and nice time under its 'us' display.
    - iostat splits out user and nice time in its display.
    
    I figure a significant amount of nice time indicates that the
    system is giving low priority processes plenty of time to run
    (which is good ... depending on for what the system is used).
    Its not good if normal and high priority processes are
    blocked on some resource, which would then allow low priority
    processes to run.
    
    	-< Ken