memory usage displsy

Per olof Ljungmark peo at
Wed Sep 2 13:32:39 UTC 2009

Bill Moran wrote:
> In response to Per olof Ljungmark <peo at>:
>> Dan Nelson wrote:
>>> In the last episode (Sep 01), Bill Moran said:
>>>> In response to Per olof Ljungmark <peo at>:
>>>>> What is a good way to find out how memory is used? Have a 6.4 box where
>>>>> memory is used by something but I fail to see what is using it - tried
>>>>> different switches to ps(1), tried the stat tools but a big chunk of
>>>>> memory does not show at all.
>>>>> A proper tool for analyzing memory usage "live", this is a production
>>>>> box?
>>>> I've always been able to get what I need from top.  You can do -o res to
>>>> sort by resident memory usage, which helps.
>>> ps will sort by memory usage when given the -m flag.  Also check ipcs -a to
>>> see if there are any sysv shared memory segments hanging arnound.  If you
>>> don't see anything using the memory, where are you seeing that "something"
>>> is using it?
>> ...and here is top output after I stopped Postfix, slapd and Cyrus-IMAP. 
>> Still over 3G Active.
> <snip>
> You did not sort by res and there are only 40 processes showing, which
> means your output is truncated and may have truncated the problematic
> process.
> Please use "top -o res" to get the output sorted by memory usage, or
> don't truncate the output (former preferred).
> Also, please provide the output of "ipcs -a"

There was no more processes...

ipcs -a
Message Queues:
T           ID          KEY MODE        OWNER    GROUP    CREATOR 
CGROUP                 CBYTES                 QNUM               QBYTES 
        LSPID        LRPID STIME    RTIME    CTIME

Shared Memory:
T           ID          KEY MODE        OWNER    GROUP    CREATOR 
CGROUP         NATTCH        SEGSZ         CPID         LPID ATIME 

T           ID          KEY MODE        OWNER    GROUP    CREATOR 

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