topic Re: sizing the kernel in Operating System - HP-UX

sizing the kernel

VINCENT SPURGEON — Mon, 17 Sep 2001 19:53:57 GMT

How does one tell how much overhead, or memory, the o/s and/or kernel is using on a HP-UX 11.xx system?

Re: sizing the kernel

Sanjay_6 — Mon, 17 Sep 2001 19:55:33 GMT

Hi,

I think "dmesg" should tell you what you are looking for. think so.

hope this helps.

thanks

Re: sizing the kernel

Sachin Patel — Mon, 17 Sep 2001 21:23:41 GMT

Hi
This was someone's reply. I like it. You might too.

for HP-UX 10x
echo physmem/D | adb -k /stand/vmunix /dev/kmem
physmem:
physmem: 24576

for HP-UX 11.x systems running on 32 bit architecture:

echo phys_mem_pages/D | adb /stand/vmunix /dev/kmem
phys_mem_pages:
phys_mem_pages: 24576

for HP-UX 11.x systems running on 64 bit architecture:

echo phys_mem_pages/D | adb64 -k /stand/vmunix /dev/mem
phys_mem_pages:
phys_mem_pages: 262144

The results of these commands are in memory pages, multiply by 4096
to obtain the size in bytes.

To determine the amount of lockable memory:

echo total_lockable_mem/D | adb -k /stand/vmunix /dev/mem
total_lockable_mem:
total_lockable_mem: 185280

To determine the number of free swap pages :

echo swapspc_cnt/D | adb -k /stand/vmunix /dev/kmem
swapspc_cnt:
swapspc_cnt: 216447

This will display the number of free swap pages.
Multiply the number returned by 4096 for the number of free swap bytes.

To determine the processor speed:

echo itick_per_usec/D | adb -k /stand/vmunix /dev/mem
itick_per_usec:
itick_per_usec: 360

To determine the number of processors in use:

echo "runningprocs/D" | adb -k /stand/vmunix /dev/mem
runningprocs:
runningprocs: 2

To determine the number of pages of buffer cache ( 4Kb in size)

echo bufpages/D | adb -k /stand/vmunix /dev/mem
bufpages:
bufpages: 18848

To display kernel parameters using adb use the parameter name :

echo nproc/D | adb -k /stand/vmunix /dev/mem
nproc:
nproc: 276

To determine the kernel your booted from:

10.x
echo 'boot_string/S' | adb /stand/vmunix /dev/mem
boot_string:
boot_string: disc(52.6.0;0)/stand/vmunix

11.x
echo 'boot_string/S' | adb /stand/vmunix /dev/mem
boot_string:
boot_string: disk(0/0/2/0.6.0.0.0.0.0;0)/stand/vmunix

Sachin

Re: sizing the kernel

VINCENT SPURGEON — Mon, 17 Sep 2001 21:29:16 GMT

The only thing I'm seeing with regards to memory is:
Memory Information:
physical page size = 4096 bytes, logical page size = 4096 bytes
Physical: 3145728 Kbytes, lockable: 2381084 Kbytes, available: 2739284 Kbytes

I see nothing about the vmunix.

Re: sizing the kernel

VINCENT SPURGEON — Mon, 17 Sep 2001 21:53:40 GMT

Is the kernel size the difference between the physical and the available?

Re: sizing the kernel

Frank Slootweg — Tue, 18 Sep 2001 08:03:04 GMT

> Is the kernel size the difference between the physical and the available?

Close. The difference also includes the size of the (probably dynamic) file system buffer cache and all tables, i.e. process table, file table, etc., etc.. I.e. "available" means memory available to processes and data.