topic Re: physical memory in Operating System - HP-UX

physical memory

u856100 — Thu, 14 Feb 2002 10:39:42 GMT

Hi all,

I have just been browsing the thread below regarding finding the physical memory on a system.

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x93f6a12d6d27d5118fef0090279cd0f9,00.html

The range of varying answers that I have got is plentiful. For example using SAM to display memory presented 4Gig which is about right for my system. However, when I use the /usr/sam/lbin/getmem command I get 120 (meg I assume as it does not display a metric).

I have also got other disparate results.

Could anyone explain this fluctuation of executable methods?

thanks for your help,

John

Re: physical memory

Carlos Fernandez Riera — Thu, 14 Feb 2002 10:53:40 GMT

1- getmem dont work for systems upper 512M?

2-Unix systems must be loaded on memory, so ther is differences among Physical and usable, and lockable memory.

3- See man pstat. Pay atention to examples.

4- Search "how much memory"... lots of questions have been answered.

Re: physical memory

Steve Steel — Thu, 14 Feb 2002 10:54:28 GMT

Hi

getmem returns a number used in a larger calculation and the other disparencies can be caused by many things.

Use SAM or this 2 line script for a quick guide.

There as well you will see discrepencies caused by rounding.

typeset -i mem=$(grep Physical /var/adm/syslog/syslog.log | awk '{print $7}')
echo $(hostname) has $mem bytes memory.+- $(( $mem /1024 )) mb

Steve Steel

Re: physical memory

federico_3 — Thu, 14 Feb 2002 11:21:00 GMT

I'd do like the following:

for 10.20
REAL_MEM=`echo "physmem/D"| adb -k /stand/vmunix /dev/kmem | tail -1 | awk '{ print $2/256} '`
for 11.00
REAL_MEM=`echo "phys_mem_pages/D"| adb -k /stand/vmunix /dev/kmem | tail -1 | awk '{ print $2/256} '`

The value upon are in MBs

Ciao
Federico

Re: physical memory

Joseph A Benaiah_1 — Fri, 15 Feb 2002 11:16:47 GMT

All methods described above work well. Here are 2 others:

1. wc -c /dev/mem gives physical memory in bytes.

2. Example code using pstat

/* pysmem.c */
#include

main()
{
struct pst_pstatic buf;
pstat_getstatic(&buf, sizeof(buf), 0, 0);
printf("Physical RAM = %ld MB\n", buf.physical_memory/256);
}

Compile this by running

cc physmem.c -o physmem

Cheers,

Joseph.

Re: physical memory

SysAdm Milano — Wed, 21 May 2003 11:12:24 GMT

error pst_static and no pst_pstatic

Re: physical memory

Geoff Wild — Wed, 21 May 2003 12:52:43 GMT

Here's one more - a script called hpmem - uses adb...

Rgds...Geoff