Page Faluts

[frank fraveletti_3]

Help HELP... I think that the attached number of page faults are very large.. Can anyone help me with kernel parms????

Attached are my kernel parms and a copy of glance report..

This is from a v class 28 processors and 24Gb of memory.

[Michael Schulte zur Sur]

Hi,

I dont think, the rate is too high. If software does a lot of reading from disk, you have a higher page fault rate.

greetings,

Michael

[Jeff Schussele · Accepted solution]

Hi Frank,

A page fault is simply a process requesting data & not finding the page in memory - hence it has to go to the disk or buffer cache to get it.
This would be entirely normal for a program that accesses very random data. It would not be normal for a program that constantly needs the *same* data or gets it's info from the disks in largely sequential access. And, of course, it could be normal for a poorly written program as well.

Rgds,
Jeff

[Jean-Luc Oudart]

High page fault can be normal (depend on what you are running on the server).

check these threads :
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=197318

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=81920


Also, you seem to have a high buffer cache (3.6Gb).
Usually for HPUX11.0 3-400Mb is ok.
For HPUX 11i this can be set higher

Regards,
Jean-Luc

[Jean-Luc Oudart]

The Unix performance cookbook
(in case you don't have it)

regards,
Jean-Luc