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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LEARN ABOUT REDHAT
ipcclean
IPCCLEAN(1) PostgreSQL Server Applications IPCCLEAN(1)
NAME
ipcclean - remove shared memory and semaphores from an aborted PostgreSQL server
SYNOPSIS
ipcclean
DESCRIPTION
ipcclean removes all shared memory segments and semaphore sets owned by the current user. It is intended to be used for cleaning up after a
crashed PostgreSQL server (postmaster(1)). Note that immediately restarting the server will also clean up shared memory and semaphores, so
this command is of little real utility.
Only the database administrator should execute this program as it can cause bizarre behavior (i.e., crashes) if run during multiuser execu-
tion. If this command is executed while a postmaster is running, the shared memory and semaphores allocated by the postmaster will be
deleted. This will result in a general failure of the backend servers started by that postmaster.
NOTES
This script is a hack, but in the many years since it was written, no one has come up with an equally effective and portable solution.
Since the postmaster can now clean up by itself, it is unlikely that ipcclean will be improved upon in the future.
The script makes assumption about the format of output of the ipcs utility which may not be true across different operating systems.
Therefore, it may not work on your particular OS.
Application 2002-11-22 IPCCLEAN(1)