High Runqueue (R) LOW CPU LOW I/O Low Network Low memory usage | Unix Linux Forums | AIX

  Go Back    


AIX AIX is IBM's industry-leading UNIX operating system that meets the demands of applications that businesses rely upon in today's marketplace.

High Runqueue (R) LOW CPU LOW I/O Low Network Low memory usage

AIX


Tags
aix, unix

Closed Thread    
 
Thread Tools Search this Thread Display Modes
    #1  
Old 01-12-2012
IL-Malti IL-Malti is offline
Registered User
 
Join Date: Jan 2011
Last Activity: 3 October 2013, 6:35 PM EDT
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
High Runqueue (R) LOW CPU LOW I/O Low Network Low memory usage

Hello All

I have a system running AIX 61 shared uncapped partition (with 11 physical processors, 24 Virtual 72GB of Memory) .

The output from NMON, vmstat show a high run queue (60+) for continous periods of time intervals, but NO paging, relatively low I/o (6000) , CPU % is 40, Low network.

The only indicators are the high number of syscalls being made. Any thoughts would be appreciated
Sponsored Links
    #2  
Old 01-12-2012
zaxxon's Avatar
zaxxon zaxxon is offline Forum Staff  
code tag tagger
 
Join Date: Sep 2007
Last Activity: 20 October 2014, 1:48 PM EDT
Location: St. Gallen, Switzerland
Posts: 6,234
Thanks: 121
Thanked 453 Times in 412 Posts
What applications running there? Is SMT activated? What OS level do you have (latest fix pack installed?)? Is that always, only at peak times? What has changed since? More info would be helpful, thanks.
Sponsored Links
    #3  
Old 01-12-2012
IL-Malti IL-Malti is offline
Registered User
 
Join Date: Jan 2011
Last Activity: 3 October 2013, 6:35 PM EDT
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
SMT is on running on a P720 (ie SMT=4), AIX TL6-SP3-1048 (6100-06-03-1048)
A DATA Base server (Universe DB). No changes on system , except volume, ie more user activity

That is the main issue: I do not have any more data to offer except observations in regards the high syscall count, I was hoping to understand how I can I get to see the syscals being made; I ran a trace---> curt and and the majority of calls are made to "unknown" routines.

Last edited by IL-Malti; 01-12-2012 at 11:36 AM..
    #4  
Old 01-12-2012
zxmaus's Avatar
zxmaus zxmaus is offline Forum Advisor  
Event Manager
 
Join Date: May 2008
Last Activity: 7 September 2014, 5:24 AM EDT
Location: in a putty session :)
Posts: 811
Thanks: 19
Thanked 70 Times in 62 Posts
can you post output of vmstat -v 2 10 taken during a peak time when your run queue is high, iostat -Dl, vmstat -v, vmstat -s outputs please. High runqueues with low cpu utilization in most cases point to IO- or memory problems
Regards
zxmaus
Sponsored Links
    #5  
Old 01-13-2012
IL-Malti IL-Malti is offline
Registered User
 
Join Date: Jan 2011
Last Activity: 3 October 2013, 6:35 PM EDT
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Here is some data; Am I right in reading: plenty of memory (no paging and tons in the fre), idle time is relative plentiful; and no io wait.....



Code:
----- ----------- ------------------------ ------------ -----------------------
r b avm fre re pi po fr sr cy in sy cs us sy id wa pc ec
12 1 3569398 5794339 0 0 0 0 0 0 4650 1770166 10110 62 20 18 0 11.32 103.0
10 1 3568772 5794931 0 0 0 0 0 0 4367 1500395 9389 51 21 28 0 10.18 92.5
18 0 3570140 5793348 0 0 0 0 0 0 4579 1797185 10839 64 21 15 0 11.46 104.2
27 0 3570626 5792608 0 0 0 0 0 0 4885 1927251 11404 63 21 16 0 11.45 104.1
32 0 3571451 5791641 0 0 0 0 0 0 4458 1842323 10604 62 21 16 0 11.33 103.0
16 2 3572631 5790341 0 0 0 0 0 0 3937 1536208 9027 58 20 22 0 10.88 98.9
22 0 3571930 5790930 0 0 0 0 0 0 4787 1489063 10280 54 21 25 0 10.75 97.7
19 1 3572992 5789819 0 0 0 0 0 0 4560 1575266 10585 57 21 22 0 10.86 98.7
0 0 3575629 5787020 0 0 0 0 0 0 4551 1609988 10993 60 20 20 0 10.84 98.6
21 0 3578575 5783902 0 0 0 0 0 0 4735 1940362 11115 66 19 15 0 11.49 104.4
23 0 3579044 5783308 0 0 0 0 0 0 3812 1734049 9016 67 17 16 0 11.57 105.1
29 1 3579558 5782506 0 0 0 0 0 0 4539 1605220 10287 61 20 19 0 11.20 101.8

Moderator's Comments:
Use code tags please, thanks.

Last edited by zaxxon; 01-13-2012 at 01:41 PM.. Reason: code tags
Sponsored Links
    #6  
Old 01-13-2012
methyl methyl is offline Forum Advisor  
Advisor
 
Join Date: Mar 2008
Last Activity: 18 April 2014, 5:13 AM EDT
Posts: 6,396
Thanks: 287
Thanked 673 Times in 642 Posts
The figures in the User CPU "us" column are high for a database system. Have you checked for looping orphan prococeses ?
Sponsored Links
    #7  
Old 01-13-2012
IL-Malti IL-Malti is offline
Registered User
 
Join Date: Jan 2011
Last Activity: 3 October 2013, 6:35 PM EDT
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
60% (on average) is deemed high for DB work? I was thinking that the "sy" (20%) was high; that is why I was thinking that my syscalls were the bottlekneck;



No looping process seen or noticed. All tasks ended whether normally ot via a time out.


Thank you all.
Sponsored Links
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

More UNIX and Linux Forum Topics You Might Find Helpful
Thread Thread Starter Forum Replies Last Post
help in high memory usage alert script robo Shell Programming and Scripting 6 09-27-2011 07:04 PM
AIX memory usage always high virusxx AIX 1 08-26-2011 07:14 AM
Memory usage shown is high radiatejava UNIX for Advanced & Expert Users 2 01-20-2011 07:17 PM
How to monitor the IBM AIX server for I/O usage,memory usage,CPU usage,network..? laknar AIX 3 07-16-2009 05:35 AM
High memory usage in AIX 5.1 jayakumarrt AIX 5 02-14-2008 06:17 PM



All times are GMT -4. The time now is 05:13 PM.