Unix/Linux Go Back    


BSD BSD, sometimes called Berkeley Unix, is a Unix operating system developed by the Computer Systems Research Group of the UC Berkeley.

Very high nice percentage in top command

BSD


Closed    
 
Thread Tools Search this Thread Display Modes
    #1  
Old Unix and Linux 04-07-2014
vibhor_agarwali vibhor_agarwali is offline
Registered User
 
Join Date: Jan 2005
Last Activity: 24 September 2015, 2:37 AM EDT
Posts: 313
Thanks: 1
Thanked 1 Time in 1 Post
Very high nice percentage in top command

Hello Folks,

Recently our FreeBSD 7.1 i386 system became very sluggish.
Nothing much is happening over there & whatever is running takes eternity to complete.

All the troubleshooting hinted towards a very high nice percentage.
Can that be the culprit?
Pasting snippets of top command, please advice whether it's a cause of concern & what are the possible remedies. Idle percentage mentions 0.


Code:
top
last pid: 32075;  load averages:  4.11,  4.18,  4.38                                                                                                       up 17+21:11:14  23:11:55
136 processes: 5 running, 131 sleeping
CPU:  0.4% user, 85.9% nice, 11.7% system,  2.0% interrupt,  0.0% idle
Mem: 811M Active, 1767M Inact, 195M Wired, 92M Cache, 112M Buf, 129M Free
Swap: 16G Total, 480K Used, 16G Free

Thanks for the support.

Last edited by Scrutinizer; 04-07-2014 at 03:17 AM.. Reason: code tags
Sponsored Links
    #2  
Old Unix and Linux 04-07-2014
Scrutinizer's Unix or Linux Image
Scrutinizer Scrutinizer is offline Forum Staff  
Moderator
 
Join Date: Nov 2008
Last Activity: 19 February 2017, 6:04 PM EST
Location: Amsterdam
Posts: 11,241
Thanks: 467
Thanked 3,195 Times in 2,822 Posts
Next thing to do is find out which processes eat the CPU cycles and why. What does ps auwx say?
Sponsored Links
    #3  
Old Unix and Linux 04-07-2014
vibhor_agarwali vibhor_agarwali is offline
Registered User
 
Join Date: Jan 2005
Last Activity: 24 September 2015, 2:37 AM EDT
Posts: 313
Thanks: 1
Thanked 1 Time in 1 Post
Not much of the CPU is being use, a compilation has been triggered.
Earlier it used to complete in ~3 hours which is now taking ~20 hours since last few days.
Here we go.


Code:
ps -auwx | head -15
USER          PID %CPU %MEM   VSZ   RSS  TT  STAT STARTED      TIME COMMAND
x            39055 10.0  6.0 196324 188288  ??  RN   11:34PM   0:04.64 [cc1plus]
x            39109  8.5  2.5 81324 76860  ??  RN   11:34PM   0:01.32 [cc1]
x            39113  8.5  2.1 67932 64280  ??  RN   11:34PM   0:01.31 [cc1]
x            39105  3.4  1.0 32612 29764  ??  RN   11:34PM   0:00.59 [cc1]
root            0  0.0  0.0     0     0  ??  DLs  20Mar14   0:02.39 [swapper]
root            1  0.0  0.0  1888   328  ??  ILs  20Mar14   0:00.19 /sbin/init --
root            2  0.0  0.0     0     8  ??  DL   20Mar14   0:32.19 [g_event]
root            3  0.0  0.0     0     8  ??  DL   20Mar14  11:25.58 [g_up]
root            4  0.0  0.0     0     8  ??  DL   20Mar14  10:16.40 [g_down]
root            5  0.0  0.0     0     8  ??  DL   20Mar14   0:00.00 [kqueue taskq]
root            6  0.0  0.0     0     8  ??  DL   20Mar14   0:00.00 [xpt_thrd]
root            7  0.0  0.0     0     8  ??  DL   20Mar14   0:00.00 [thread taskq]
root            8  0.0  0.0     0     8  ??  DL   20Mar14   0:00.00 [igb0 taskq]
root            9  0.0  0.0     0     8  ??  DL   20Mar14   0:00.00 [igb1 taskq]

Moderator's Comments:
Very high nice percentage in top command Please use code tags when posting code or data samples

Last edited by Scrutinizer; 04-07-2014 at 03:39 AM.. Reason: code tags
    #4  
Old Unix and Linux 04-07-2014
Scrutinizer's Unix or Linux Image
Scrutinizer Scrutinizer is offline Forum Staff  
Moderator
 
Join Date: Nov 2008
Last Activity: 19 February 2017, 6:04 PM EST
Location: Amsterdam
Posts: 11,241
Thanks: 467
Thanked 3,195 Times in 2,822 Posts
So were the top en ps commands run at the same time? Because this adds up to 20% user/nice time whereas the top shows 86.3% user/nice time.
Sponsored Links
    #5  
Old Unix and Linux 04-07-2014
vibhor_agarwali vibhor_agarwali is offline
Registered User
 
Join Date: Jan 2005
Last Activity: 24 September 2015, 2:37 AM EDT
Posts: 313
Thanks: 1
Thanked 1 Time in 1 Post
There was a gap.
Detail output of top with processes, this will suffice alone & won't require ps I believe.


Code:
last pid: 44000;  load averages:  4.20,  4.21,  4.18                                                                                                       up 17+21:56:07  23:56:48
137 processes: 5 running, 132 sleeping
CPU:  0.8% user, 83.2% nice, 14.5% system,  1.6% interrupt,  0.0% idle
Mem: 1128M Active, 1517M Inact, 196M Wired, 94M Cache, 112M Buf, 60M Free
Swap: 16G Total, 480K Used, 16G Free

  PID USERNAME         THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
43983 x                   1 108   10   143M   135M RUN      0:03 11.18% cc1plus
43994 x                   1 108   10 86428K 83804K RUN      0:02 10.89% cc1
43862 x                   1 106   10   256M   252M RUN      0:10  2.78% cc1plus
43863 x                   1  -8   10 15416K 13184K piperd   0:00  0.20% as
  894 root               1   4    0  9324K  9352K select  62:29  0.00% amd
 1039 root               1   4    0 11456K  3220K select   9:12  0.00% nmbd
80586 x                  1   4   10 80952K 77828K select   4:42  0.00% bmake
 1051 root               1   4    0 14816K  5508K select   2:21  0.00% winbindd
 1126 root               1   4    0 14240K  7908K select   1:45  0.00% ruby
 1008 root               1   4    0  4724K  1948K select   1:06  0.00% ntpd
 1064 root               1   4    0 15868K  6312K select   0:58  0.00% winbindd
  872 root               1  44    0  3392K  1408K select   0:49  0.00% rpcbind
 1045 root               1   4    0 17072K  5780K select   0:48  0.00% smbd

Sponsored Links
    #6  
Old Unix and Linux 04-07-2014
Corona688 Corona688 is offline Forum Staff  
Mead Rotor
 
Join Date: Aug 2005
Last Activity: 17 February 2017, 3:53 PM EST
Location: Saskatchewan
Posts: 21,919
Thanks: 1,049
Thanked 4,094 Times in 3,793 Posts
Somebody is running large compile jobs, and was polite enough to nice them -- i.e. run them low-priority, so they won't steal time from anything more important.

If you aren't having performance problems, and they are authorized to use cc, I don't think this is a problem.
Sponsored Links
    #7  
Old Unix and Linux 04-07-2014
MadeInGermany MadeInGermany is offline Forum Advisor  
Registered User
 
Join Date: May 2012
Last Activity: 19 February 2017, 2:45 PM EST
Location: Simplicity
Posts: 3,408
Thanks: 262
Thanked 1,123 Times in 1,018 Posts
A run-queue of 4 needs 4 CPU cores to handle, otherwise speed is affected. For example, it needs 4 single-core 386 CPUs.

Code:
vmstat 2

shows the run queue (that is the major contributor to the load shown by top and uptime).
Further it might show paging activity.
Sponsored Links
Closed

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Linux More UNIX and Linux Forum Topics You Might Find Helpful
Thread Thread Starter Forum Replies Last Post
Top cmd showing NICE value 97% -what to tune? hpuxadmin HP-UX 5 03-19-2012 11:55 AM
How to see high values on top learnbash Shell Programming and Scripting 3 05-11-2010 09:32 AM
top and nice CBorgia HP-UX 5 02-04-2008 02:16 PM
nice command and nice() system call tejbuch Programming 2 11-12-2006 04:21 PM
[Top output] NICE % high ? eliador2001 UNIX for Dummies Questions & Answers 0 04-17-2004 09:21 AM



All times are GMT -4. The time now is 07:42 PM.