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

Kernel parameter

yairg — Wed, 10 Dec 2003 13:50:17 GMT

Hi
I have program that need above 850M memory size
but after my process allocated 850M memory my process crashed

Can you tell me which kernel parameter define this size ?

10x

Re: Kernel parameter

RAC_1 — Wed, 10 Dec 2003 13:52:53 GMT

What program crashed? What is error message?

What is ur OS?

Re: Kernel parameter

yairg — Wed, 10 Dec 2003 13:54:50 GMT

system infomation :

hpux 11.11
4 CPU
10G Mem
model rp7405

Re: Kernel parameter

A. Clay Stephenson — Wed, 10 Dec 2003 13:55:27 GMT

Almost certainly this is maxdsiz (or its 64-bit cousin maxdsiz_64bit if this is a 64-bit process). The other thing that could be getting you is that this is a 32-bit process and unless you take some special steps 1GB is the limit but often much less than this can actually be allocated because no available chunk is large enough.

Its possible that you are limited by maxssiz but anything needing a stack larger than about 64M is seriously miscoded.

Re: Kernel parameter

Pete Randall — Wed, 10 Dec 2003 13:55:53 GMT

Probably one of the maxXsize parameters:
maxdsiz
maxssiz
mzxtsiz
or their 64 bit cousins:
maxdsiz_64bit
etc.

Pete

Re: Kernel parameter

Sanjay_6 — Wed, 10 Dec 2003 13:57:28 GMT

Hi,

Try these,

http://docs.hp.com/hpux/onlinedocs/939/KCParms/KCparam.ProcessParamsList.html

Hope this helps.

Regds

Re: Kernel parameter

yairg — Wed, 10 Dec 2003 13:57:42 GMT

Hi
My process is 32 bit and those are my current kernel params:

maxdsiz 3221225472 - 3221225472
maxdsiz_64bit 0x40000000 - 0X40000000
maxfiles 200 - 200
maxfiles_lim 2048 Y 2048
maxqueuetime - - 0
maxssiz 83570688 - 83570688
maxssiz_64bit 0x800000 - 0X800000
maxswapchunks 2048 - 2048
maxtsiz 1073741824 Y 1073741824
maxtsiz_64bit 0x40000000 Y 0X40000000

Re: Kernel parameter

A. Clay Stephenson — Wed, 10 Dec 2003 14:17:19 GMT

Typically, about 900 MB or so is as good as it gets unless you compile with -N to set EXEC_MAGIC. This allows you to cross a 1GB quadrant barrier. The real answer to your problem is to compile as a 64-bit program and then your problems completely go away.

If your down have the source, you can use chatr to enable EXEC_MAGIC.

Re: Kernel parameter

yairg — Wed, 10 Dec 2003 14:22:33 GMT

we are using aCC can you send me please the commpilation , link command line with this flag .

Re: Kernel parameter

A. Clay Stephenson — Wed, 10 Dec 2003 14:32:12 GMT

The answer is the same for ANSI C and aCC, add -N to the aCC command and the instructions are passed along to ld.

Re: Kernel parameter

yairg — Wed, 10 Dec 2003 14:46:01 GMT

Dear A.Clay Stephenson
Thanks you very very much - you saved my life
(-;