topic Re: Kernel Params in Operating System - HP-UX

Kernel Params

Scott D. Allen — Wed, 26 Jul 2000 14:26:43 GMT

General kernel question:

1. Where is a good online source for kernel parameter definitions etc?
2. maxdsiz, maxtsiz, maxssiz: what do these three parameters do and how do they relate to each other?

Also, when I do sysdef and get the values of those parameters, it says units=pages. What's the value of a page?

--Scott

Re: Kernel Params

Anthony deRito — Wed, 26 Jul 2000 14:32:50 GMT

Use SAM -> Kernel Configuration -> Configurable Parameters -> Help (on top menu bar) -> Overview -> tab down to Configurable Kernel Parameters. Pick the kernel parameter on the lower screen and get info you want.

Tony

Re: Kernel Params

Antoanetta Naghiu — Wed, 26 Jul 2000 14:38:24 GMT

Take a look on http://docs.hp.com/hpux/content/KCparams.OverviewAll.html

Re: Kernel Params

Andy Monks — Wed, 26 Jul 2000 14:39:46 GMT

maxdsiz controls the how big an individual user process can be. If you set it at 64mb (the default), no process can be larger. Things like oracle etc need this set much higher.

maxtsiz is the size of the largest program you can run. This is the executable size not the data.

maxssiz controls the size of the stack.

normally, you won't change maxtsiz. maxssiz is changed frequently, and almost everyone changed maxdsiz.

If a process hits anyone of these limits, the system will stop the process (root of course ignores these limits).

As for what you should set them too. The best answer is, 'read the release notes for the applications your using'. Recommendations for Oracle would be completely different from something a web server.

Re: Kernel Params

Brian M. Fisher — Wed, 26 Jul 2000 14:48:21 GMT

A very good source of HP-UX 11.0 Configurable Kernel Parameters can be found at:

http://www.docs.hp.com/hpux/content/KCparams.OverviewAll.html

This page includes hot links to each kernel parameter giving:
Acceptable Values
Description
Related Parameters
And Additional Information

Brian
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