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Full Discussion: AIX 5.2 performance question
Operating Systems AIX AIX 5.2 performance question Post 302256972 by zaxxon on Tuesday 11th of November 2008 02:07:58 AM
Old 11-11-2008
Ok. So far the system looks as if it has never been tuned. Before we make any changes, best do a backup of your current values with following commands:

vmo -x > /root/vmo.backup
ioo -x > /root/ioo.backup
  1. I'd recommend you try the vmo settings shockneck posted to get rid of the paging space ins/outs. There is not much paging but there is and this is bad, slowing your system down.
    You can watch it with "vmstat 1" and hopefully there will be soon only zeros in the column for "pi" and "po".
  1. You have a lot of different blocked buffers which can be seen from your "vmstat -vs". Use the following to get rid of them:

    ioo -p -o hd_pbuf_cnt=1024
    ioo -p -o j2_nBufferPerPagerDevice=1024
    ioo -p -o numfsbufs=4096
    ioo -p -o j2_maxPageReadAhead=128
    vmo -p -o maxfree%=240
    vmo -p -o minfree%=100

After all these changes best is to reboot, since the VMM options get active immediately but it would take some time until your memory is cleaned up. Also the ioo stuff will become active after remounting your filesystems etc.. so a reboot is worth it.
The ioo settings you can monitor with "vmstat -v" after the reboot, as the counters for the blocked buffers will be resetted. If you constantly repeat the "vmstat -v" every 5 mins and you get no or very slow/small increases on the blocked buffer rows, ie. those:

Code:
     284 pending disk I/Os blocked with no pbuf
     2481 paging space I/Os blocked with no psbuf
     20770484 filesystem I/Os blocked with no fsbuf
     0 client filesystem I/Os blocked with no fsbuf
     73 external pager filesystem I/Os blocked with no fsbuf

Btw, I guess you have most FS still jfs? You can check it with "lsfs".

Also it would be good to know if your application supports asynchronous I/O, abbrevated AIO. If you don't know, we can check it out, but that as a next step.
Is there also some database running like Oracle for example?
  1. Data for getting new disks of any kind you have a lot! Just show them the %tm_act of the iostat you posted which is constantly about 90% often 100% related to the fact, that high frequented application and data reside on the same disks like the OS which is usually a no go for serious/professional server setup. This is kind of a no-go criteria.

Let us know if it helped anything so far.

Edit:
If you get them that far, that they were so generous to spend their own server some sort of discs, maybe they add a cd/dvd drive. Else you could export the update disc via NFS for example from some Linux PC etc. to make the update and you should update.
Last edited by zaxxon; 11-11-2008 at 03:17 AM..
 

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LEARN ABOUT DEBIAN

x11perfcomp

X11PERFCOMP(1)						      General Commands Manual						    X11PERFCOMP(1)

NAME

       x11perfcomp - X11 server performance comparison program

SYNTAX

       x11perfcomp [ -r | -ro ] [ -l label_file ] files

DESCRIPTION

       The  x11perfcomp program merges the output of several x11perf(1) runs into a nice tabular format.  It takes the results in each file, fills
       in any missing test results if necessary, and for each test shows the objects/second rate of each server.  If invoked with the  -r  or  -ro
       options, it shows the relative performance of each server to the first server.

       Normally,  x11perfcomp  uses  the first file specified to determine which specific tests it should report on.  Some (non-DEC :) servers may
       fail to perform all tests.  In this case, x11perfcomp automatically substitutes in a rate of 0.0  objects/second.   Since  the  first  file
       determines  which  tests  to  report  on, this file must contain a superset of the tests reported in the other files, else x11perfcomp will
       fail.

       You can provide an explicit list of tests to report on by using the -l switch to specify a file of labels.  You can create a label file	by
       using the -label option in x11perf.

OPTIONS

       x11perfcomp accepts the options listed below:

       -r	       Specifies that the output should also include relative server performance.

       -ro	       Specifies that the output should include only relative server performance.

       -l label_file   Specifies a label file to use.

X DEFAULTS

       There are no X defaults used by this program.

SEE ALSO

       X(7), x11perf(1)

AUTHORS

       Mark Moraes wrote the original scripts to compare servers.
       Joel McCormack just munged them together a bit.

X Version 11							   x11perf 1.5.4						    X11PERFCOMP(1)
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