topic Re: How to calculate user memory, system memory and buffer cache values? in Operating System - HP-UX

How to calculate user memory, system memory and buffer cache values?

Roger Jackson — Wed, 27 Dec 2000 23:45:53 GMT

Can somebody please help me to determine user memory, system memory and buffer cache info, similar to what glance provides using the pstat functions or any other C functions (excluding system()). I want to be able to complete my C program (see attachment) to retrieve all this information without using sysdef, glance etc..

Thanks in advance for any assistance.

Re: How to calculate user memory, system memory and buffer cache values?

bhoopathi_1 — Fri, 29 Dec 2000 13:48:23 GMT

Try running dmesg command from root. Probably the output helps you.

Re: How to calculate user memory, system memory and buffer cache values?

Curtis Larson — Fri, 29 Dec 2000 19:28:20 GMT

from: ftp://contrib:9unsupp8@hprc.external.hp.com/sysadmin/coolscripts/memsize.c

/* Get actual memory size in bytes */
#include
#include
main()
{
struct pst_static buf;
pstat_getstatic(&buf,sizeof(struct pst_static),1,0);
printf("%u\n",buf.physical_memory*buf.page_size);
}

Re: How to calculate user memory, system memory and buffer cache values?

Roger Jackson — Tue, 02 Jan 2001 00:02:08 GMT

1. Unfortunately, I'm not a system administrator and I don't have root access to run dmesg.

2. I have been able to determine the real physical memory in my 'C' program already (refer to original attachment). I just don't know which 'C' structures to use and/or calculations I need to perform to determine user memory, system memory and buffer cache values.

Any other ideas?

Re: How to calculate user memory, system memory and buffer cache values?

Suhas_2 — Tue, 02 Jan 2001 14:58:53 GMT

Hi,
Pls try using "sar"...it has a wide variety of outputs....
Seconly "top" will also give you much information.
the typical uses are as below...
/bin/top -s 1
/bin/sar -k 2 2

I am searching more..as I know this might just not be suffice....;-))

Suhas.

Re: How to calculate user memory, system memory and buffer cache values?

Steven Sim Kok Leong — Wed, 03 Jan 2001 06:31:01 GMT

Hi,

Use adb to extract real-time kernel information (eg. real-time user memory, system memory and buffer-cache usage) ie. # adb -k /stand/vmunix /dev/mem.

Hope this helps. Regards.

Steven Sim
Brainbench MVP for Unix Admin
http://www.brainbench.com