High CPU Usage , users affected Post: 302887021

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Operating Systems AIX High CPU Usage , users affected Post 302887021 by rbatte1 on Wednesday 5th of February 2014 06:06:47 AM

02-05-2014

Moderator

So, this is a partitioned server. It has an allocation of 1.3 CPUs. I'm assuming therefore that there are other partitions defined, and perhaps a little spare CPU on the chassis as a whole. If the partition is capped, then it will use up to 1.3 CPUs and no more. If it is uncapped and there is spare CPU then it will burst through the limit and you will see the value for entitled CPU on sar or vmstat exceeding 100%.

If you take the cap off the partition and other servers are busy, they will be guaranteed to get their allocated CPU as a minimum, however as already pointed out by Zaxxon, you are not CPU bound (95% entitled capacity)

Consider partitions:-

1.3 CPU shared
3.0 CPU shared
2.0 CPU dedicated
1.7 CPU shared

Server has 8 CPUs. Two are dedicated, so out of the reckoning. If the shared CPU partitions are all uncapped, then if the other two are idle, the busy one could get 6 CPUs. If all are busy, then they will be limited as shown. If partition 4 is idle and 1 & 2 are busy then they will compete for the spare CPU (after both have reached their entitled CPU limit) and you can weight them to show a preference.

You may be better just upping your CPU allocation a little then re-activating the partition (not just a reboot) else your end user will get used to having the full spare CPU available and then complain when it's in use elsewhere on the chassis. Is there another partition you could squeeze down, but take the cap off because it is rarely busy?

We have our set as 0.1 CPU, production uncapped, test/dev capped.

I hope that this helps.

Robin
Liverpool/Blackburn
UK

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nmon

NMON(1) 							   User Commands							   NMON(1)

NAME

       nmon - systems administrator, tuner, benchmark tool.

DESCRIPTION

       This manual page documents briefly the nmon command.  This manual page was written for the Debian distribution because the original program
       does not have a manual page.

       nmon is is a systems administrator, tuner, benchmark tool.  It can display the CPU, memory, network, disks (mini graphs or  numbers),  file
       systems, NFS, top processes, resources (Linux version & processors) and on Power micro-partition information.

OPTIONS

       nmon follow the usual GNU command line syntax, with long options starting with two dashes (`-').  nmon [-h] [-s <seconds>] [-c <count>] [-f
       -d <disks> -t -r <name>] [-x] A summary of options is included below.

       -h     FULL help information

	      Interactive-Mode: read startup banner and type: "h" once it is running For Data-Collect-Mode (-f)

       -f	     spreadsheet output format [note: default -s300 -c288]
	      optional

       -s <seconds>  between refreshing the screen [default 2]

       -c <number>   of refreshes [default millions]

       -d <disks>    to increase the number of disks [default 256]

       -t	     spreadsheet includes top processes

       -x	     capacity planning (15 min for 1 day = -fdt -s 900 -c 96)

AUTHOR

       nmon was written by Nigel Griffiths <nag@uk.ibm.com>

       This manual page was written by Giuseppe Iuculano <giuseppe@iuculano.it>, for the Debian project (but may be used by others).

nmon								    August 2009 							   NMON(1)