04-08-2019
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
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FREE(1) User Commands FREE(1)
NAME
free - Display amount of free and used memory in the system
SYNOPSIS
free [options]
DESCRIPTION
free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The
shared memory column should be ignored; it is obsolete.
OPTIONS
-b, --bytes
Display the amount of memory in bytes.
-k, --kilo
Display the amount of memory in kilobytes. This is the default.
-m, --mega
Display the amount of memory in megabytes.
-g, --giga
Display the amount of memory in gigabytes.
--tera Display the amount of memory in terabytes.
-h, --human
Show all output fields automatically scaled to shortest three digit unit and display the units of print out. Following units are
used.
B = bytes
K = kilos
M = megas
G = gigas
T = teras
If unit is missing, and you have petabyte of RAM or swap, the number is in terabytes and columns might not be aligned with header.
-c, --count count
Display the result count times. Requires the -s option.
-l, --lohi
Show detailed low and high memory statistics.
-o, --old
Display the output in old format, the only difference being this option will disable the display of the "buffer adjusted" line.
-s, --seconds seconds
Continuously display the result delay seconds apart. You may actually specify any floating point number for delay, usleep(3) is
used for microsecond resolution delay times.
--si Use power of 1000 not 1024.
-t, --total
Display a line showing the column totals.
--help Print help.
-V, --version
Display version information.
FILES
/proc/meminfo
memory information
SEE ALSO
ps(1), slabtop(1), top(1), vmstat(8).
AUTHORS
Written by Brian Edmonds.
REPORTING BUGS
Please send bug reports to <procps@freelists.org>
procps-ng September 2011 FREE(1)