topic Re: pagezerod Daemon in Operating System - HP-UX

pagezerod Daemon

Avinash20 — Wed, 03 Jan 2007 09:15:32 GMT

Hi Gurus,

Could anybody let me know, what is the functionality of "pagezerod" Daemon. It is utilizing 20% of my CPU speed.
Could I get suggestion on the above issue,

Re: pagezerod Daemon

James R. Ferguson — Wed, 03 Jan 2007 09:19:16 GMT

Hi:

The "d" stands for daemon. This is the "page zero daemon". The man pages for 'pagezero_daemon_enabled(5)' document it. The daemon "...that reduces the elapsed time for completing kernel operations like page faults, mlock(), and so on. The idea is to zero out large free pages (4MB and above in size) during times when the CPU is idle."

Regards!

...JRF...

Re: pagezerod Daemon

Pete Randall — Wed, 03 Jan 2007 09:20:53 GMT

I've never heard of such a daemon. However, here are a couple of references that do mention it:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1028470
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=987130

Pete

Re: pagezerod Daemon

Avinash20 — Wed, 03 Jan 2007 09:27:40 GMT

The pagezero daemon is a performance enhancement that reduces the elapsed time for completing kernel operations like page faults, mlock(), and so on. The idea is to zero out large free pages (4MB and above in size) during times when the CPU is idle. The daemon has been specially designed to ensure that it only executes for brief times when the CPU is idle.

http://www.docs.hp.com/en/B2355-60105/pagezero_daemon_enabled.5.html

Hope that helps,