topic Re: BOOT SEQUENCE in Operating System - HP-UX

BOOT SEQUENCE

sreeIN — Wed, 26 May 2010 02:08:04 GMT

can anybody explain what is swapper process(PROCESS 0) in the boot sequence of HP UX

Re: BOOT SEQUENCE

ani007 — Wed, 26 May 2010 02:35:10 GMT

Hi,
The swapper process is part of the kernel.It should have PID 0 and is in charge of scheduling processes. Please find the URL (boot sequence)

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1274843768268+28353475&threadId=1359863.

Re: BOOT SEQUENCE

ani007 — Wed, 26 May 2010 02:39:20 GMT

If you are not able to open the URL please try this
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1274843768268+28353475&threadId=1359863

Re: BOOT SEQUENCE

Kranti Mahmud — Wed, 26 May 2010 02:41:25 GMT

Hi sreeIN,

BOOT SEQUENCE of HPUX:

Boot Sequence:
1. Poweron.
2. PDC Activates and checks for cpu and memory and other peripheral connected to it.
3. Checks if AUTOBOOT Flag is on. If yes , its try to locate the Primary boot path, and loads Initial system loader , from Primary boot path.
4. ISL Loads the secondery loader called hp-ux.
5. hpux loads the kernel /stand/vmunix
6. kernel starts first process swapper , and then init
7. Shell /sbin/pre_init_rc executes
8. init locates /etc/inittab
9. /etc/inittab starts the system the default run level , mentioned with "initdefault" parameter.
10. Then executes /sbin/bcheckrc and activates LVM ,

It does following:

1. activates LVM (if appplicable).
2. runs eisa_config in automatic mode
3. checks the file systems before mounting
4. checking reside in /sbin/fs//bcheckrc)
5. mounting any file systems.
6. It checks for the file /sbin/lvmrc and , /etc/lvmrc activates the LVM , if AUTO_VG_ACTIVATE=1 mentioned.
7. Then it spawns getty process , cons:123456:respawn:/usr/sbin/getty console console and it gives login : prompt...

Rgds-Kranti

Re: BOOT SEQUENCE

sreeIN — Wed, 26 May 2010 03:31:23 GMT

can u detail what actually swapper process does...............

Re: BOOT SEQUENCE

Laurent Menase — Wed, 26 May 2010 07:32:45 GMT

swapper is there to schedule tidy kernel memory, page out process when system is short in memory,...