Finding process taking up resources Post: 302218347

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Operating Systems AIX Finding process taking up resources Post 302218347 by zaxxon on Friday 25th of July 2008 02:18:12 AM

07-25-2008

Registered User

Topas is very good, yes, and since AIX 5.x it is automatically installed iirc.
Also a simple vmstat can show a lot of stuff at 1st glance.
As rhfrommn said, nmon is very good too and has tools to make Excel-Sheets or graph charts etc.

To interpret such data you have to read about performance tuning as in several tuning guides on the web or the IBM Red Books.
I also like the publications of Jaqui Lynch you can find easily on the web, as this here on her webpage: http://www.circle4.com/papers/pseries-a26-aug06.pdf
Also her initial tuning recommendation is good too.

But don't look at tuning like you have some set levers that you pull and buttons you push and all get's better. There are sometimes big differences in how machines are getting used and often AIX can be tuned as well as possible and the application(s) still "spits in the soup", because it needs tuning accordingly.

Overall, experience is of course very important too, but there is a point where you have to start Smilie

And where people work, problems can occure, that's natural and so absolut normal... Oh, I got philiosphic lol Smilie

zaxxon

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LEARN ABOUT REDHAT

elvtune

ELVTUNE(8)						      System Manager's Manual							ELVTUNE(8)

NAME

       elvtune - I/O elevator tuner

SYNOPSIS

       elvtune [ -r r_lat ] [ -w w_lat ] [ -b b_max ] /dev/blkdev1 [ /dev/blkdev2 ...  ]

       elvtune -h

       elvtune -v

DESCRIPTION

       elvtune	allows	to  tune the I/O elevator per blockdevice queue basis. The tuning can be safely done at runtime. Tuning the elevator means
       being able to change disk performance and interactiveness. In the output of elvtune the address of the queue tuned will be shown and it can
       be  considered  as  a queue ID.	For example multiple partitions in the same harddisk will share the same queue and so tuning one partition
       will be like tuning the whole HD.

OPTIONS

       -r r_lat
	      set the max latency that the I/O scheduler will provide on each read.

       -w w_lat
	      set the max latency that the I/O scheduler will provide on each write.

       -b b_max
	      max coalescing factor allowed on writes when there are reads pending in the queue.

       -h     help.

       -v     version.

NOTE

       Actually the only fields tunable are those relative to the IO scheduler. It's not possible to select a one-way or two-way elevator yet.

       For logical blockdevices like LVM the tuning has to be done on the physical devices. Tuning the queue of the LVM logical device is useless.

RETURN VALUE

       0 on success and 1 on failure.

HISTORY

       Ioctls for tuning elevator behaviour were added in Linux 2.3.99-pre1.

AUTHORS

       Andrea Arcangeli <andrea@suse.de> SuSE

Version 1.0							   14 March 2000							ELVTUNE(8)