Pinned system memory growing constantly Post: 303033558

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Operating Systems AIX Pinned system memory growing constantly Post 303033558 by trifo75 on Monday 8th of April 2019 09:41:01 AM

04-08-2019

Registered User

Pinned system memory growing constantly

Hi,

Pre data: a server running AIX 6.1 TL9 with 2GB memory and a small amount of CPU, running a very light workload.

I have a server which crashed on lack of memory. After the crash I found - using nmon analyser - that there was something eating up memory. Nmon referred to it as "system".

Now, after 2 days of uptime I see that the same "someting" is eating up memory again. I've been using nmon, vmstat and svmon to see what is happening, but all I see is that

- all user process is using the same amount of memory
- vmstat shows a steady decrease on free list
- svmon -G shows the same steady amount of memory being pinned
- svmon -P shows that there is no change of pinned memory usage in the listed processes

The rate of memory loss is about 0.5% in every hour.

So I assume that some kernel related object is accumulating the pinned memory.

Can you please help me to find out the problematic part?

Additional info: there was a reported bug in AIX7.2 which have been corrected in an update. But: this machine was running for a while without any problems.

--Trifo

trifo75

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LEARN ABOUT DEBIAN

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)

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