Memory Use - TOPAS v NMON

[tempest92]

Hi,

When i look at memory usage i get the following -

TOPAS -
MEMORY
Real,MB 1536
% Comp 45.3
% Noncomp 14.5
% Client 14.5

NMON -
FileSystemCache (numperm) 14.0%
Process 9.1%
System 36.1%
Free 40.8%

NMON appears to break down the %Comp between Process and System. What would fall into each of these and how would i indentify what is making up these totals.

Thanks !!

 

[RodKnowlton]

System" would be memory used in kernel activities and other system calls. "Process" would be running programs that aren't paged out.

As to identifying the makeup, some combination of svmon, ps, tprof, and truss can probably get you pretty close.

Just curious, how long had the machine been up when you got that NMON output? Having a value of Free > 1 is very unusual on a system that's been running for any length of time (assuming it reads files now and then).

- Rod


IBM Certified Advanced Technical Expert pSeries and AIX 5L
CompTIA Linux+
CompTIA Security+

Wish you could view posts with a fixed font? Got Firefox & Greasemonkey? Give yourself the option.

 

[tempest92]

thanks rod.

this was a sandbox that had little or no activity since last reboot.

thanks again !!

 

[tempest92]

do you know how to do this with svmon ? i only seem to be able to work out what makes up the process % not the system %.

thanks.

 

[RodKnowlton]

I'm not sure you can. The system % is hidden away in various operating system "black boxes" like the kernel, device drivers, and the pager.

A lot of it will typically be involved in I/O, so you might try using filemon to determine the most active files, then work backwards from there to determine the processes. [tt]lsof[/tt] would probably be helpful in your investigation. It's available as part of the AIX Toolbax for Linux Applications.

- Rod



IBM Certified Advanced Technical Expert pSeries and AIX 5L
CompTIA Linux+
CompTIA Security+

Wish you could view posts with a fixed font? Got Firefox & Greasemonkey? Give yourself the option.

 

[tempest92]

thanks again rod !