memory usage displsy

Bill Moran wmoran at
Wed Sep 2 12:33:50 UTC 2009

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.


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

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"

Bill Moran

More information about the freebsd-questions mailing list