From: Julio Ramos (jramos@mail.tim.com.pe)
Date: Mon May 27 2002 - 18:53:13 EDT
Hello managers , I received a answer about this ask.
The reason your %MEM is more than 100% is. The column has the procceses that
are sharing memory space also. So if a
you have 4 procceses sharing 5% of memory. This would add up to be 20% of
memory.. But it really only using 5%.
If you want to know how much memory is not being used in your sytem use the
following command. Do not use the 1 first line. Use the second
or more line.. The first line is total since the system was last booted.
# vmstat 5 5 ... look at the free column, this is the free memory
Benny Arledge
Compaq Tru64 UNIX Support
> -----Mensaje original-----
> De: Julio Ramos
> Enviado el: Viernes 24 de Mayo de 2002 12:05 PM
> Para: 'tru64-unix-managers@ornl.gov'
> Asunto: Percentage of real memory usage (%MEM)
> Importancia: Alta
>
> Hi managers,
> I have a question from a user about % MEM, I found in
> http://www.tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51A_HTML/ARH9
> GBTE/TITLE.HTM
> information of % MEM, but how can i explain about of 4.0 or 12.7 in % MEM
> ?, how can to calculate it ?
>
> Saludos
>
> Julio Ramos
>
>
> P.D.
> This information is in chapter 6
> 6.3.2 Displaying Memory by Using the ps Command
> To display the current state of the system processes and how they use
> memory, enter:
> # /usr/ucb/ps aux
> Information similar to the following is displayed:
> USER PID %CPU %MEM VSZ RSS TTY S STARTED TIME COMMAND
> chen 2225 5.0 0.3 1.35M 256K p9 U 13:24:58 0:00.36 cp /vmunix
> /tmp
> root 2236 3.0 0.5 1.59M 456K p9 R + 13:33:21 0:00.08 ps aux
> sorn 2226 1.0 0.6 2.75M 552K p9 S + 13:25:01 0:00.05 vi met.ps
> root 347 1.0 4.0 9.58M 3.72 ?? S Nov 07 01:26:44
> /usr/bin/X11/X -a
> root 1905 1.0 1.1 6.10M 1.01 ?? R 16:55:16 0:24.79
> /usr/bin/X11/dxpa
> mat 2228 0.0 0.5 1.82M 504K p5 S + 13:25:03 0:00.02 more
> mat 2202 0.0 0.5 2.03M 456K p5 S 13:14:14 0:00.23 -csh (csh)
> root 0 0.0 12.7 356M 11.9 ?? R < Nov 07 3-17:26:13 [kernel
> idle]
> [1] [2] [3] [4] [5] [6] [7]
>
>
> The ps command displays a snapshot of system processes in order of
> decreasing CPU usage, including the execution of the ps command itself. By
> the time the ps command executes, the state of system processes has
> probably changed.
> The ps command output includes the following information that you can use
> to diagnose CPU and virtual memory problems:
> Percentage of CPU time usage (%CPU). [Return to example]
> Percentage of real memory usage (%MEM). [Return to example]
>
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