topic Re: ulimit setting in Operating System - HP-UX

ulimit setting

ng_7 — Thu, 28 May 2009 09:20:49 GMT

hi, experts,

I would like to increase my data and stack limit to 3.8 GB. What I did was change maxdsiz and maxdsix_64bit from 2GB to 3.8GB (old and new setting as per attached)

after restart server, I notice my data limit is as below
ulimit -aH
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 4292870144
stack(kbytes) 262144
memory(kbytes) unlimited
coredump(blocks) unlimited
nofiles(descriptors) 2048

and ulimit -aS is
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 4292870144
stack(kbytes) 262144
memory(kbytes) unlimited
coredump(blocks) 4194303
nofiles(descriptors) 2048

is it something is wrong ? I also tried to set to 3GB but I get the below error

ulimit -d 3145728
su: ulimit: The specified value exceeds the user's allowable limit.

please advise what is the problem
thanks

Re: ulimit setting

Venkatesh BL — Thu, 28 May 2009 09:33:22 GMT

Can you post the "chatr " output? If your application is 'myapp', post output of "chatr ./myapp"

Re: ulimit setting

johnsonpk — Thu, 28 May 2009 09:49:31 GMT

Hi ,

>>ulimit -d 3145728
su: ulimit: The specified value exceeds the user's allowable limit.

The system wide stack is only 256 MB and allowable maximum value for stack ulimit command is 256MB
You may need to change the system wide stack according to your requirement by changing the kernel parameters maxssize and maxssize_64bit

thanks!!
Johsnon

Re: ulimit setting

johnsonpk — Thu, 28 May 2009 09:52:52 GMT

Ooops..apologize for the wrong post ...

please ignore the previous post ..

Thanks!!
Johnson

Re: ulimit setting

ng_7 — Thu, 28 May 2009 11:44:24 GMT

1.
Can you post the "chatr " output? If your application is 'myapp', post output of "chatr ./myapp"

I not sure what you mean, this is my Oracle Application Server, so what should I type.

2. hi, Johnson,

is the below post is the wrong one ?

>>ulimit -d 3145728
su: ulimit: The specified value exceeds the user's allowable limit.

The system wide stack is only 256 MB and allowable maximum value for stack ulimit command is 256MB
You may need to change the system wide stack according to your requirement by changing the kernel parameters maxssize and maxssize_64bit

Re: ulimit setting

johnsonpk — Thu, 28 May 2009 12:17:11 GMT

Hi its apply to stack size ..since you have problem with data (ulimit -d) my post is not valid.

By the way ,try changing the softlimit

ulimit -Sd 3145728

>>ulimit -Hd 31400
su: ulimit: The specified value exceeds the user's allowable limit

I saw this kind of error some time ,when I tried to execute ulimit -Hd

what i did is change it with ulimit -Sd 31400
and then executed ulimit -Hd 31400

To increase the stack size you may need to tune the kernel parameters as i said in the previous post

Thanks!!
Johnson

Thanks!!
Johnson

Re: ulimit setting

ng_7 — Thu, 28 May 2009 12:24:06 GMT

hi, I need your solution urgently,

why my data become so big

data(kbytes) 4292870144

after I increase my maxdsiz_64bit and maxdsiz to 3.8GB ?

is this correct ? I tried to set

ulimit -d 3145728 but get the below error
su: ulimit: The specified value exceeds the user's allowable limit.

thanks

Re: ulimit setting

Patrick Wallek — Thu, 28 May 2009 12:37:58 GMT

I bet you went an order of magnitude too high when you set the kernel parameter.

What value did you use for maxdsiz and maxdsiz_64?

Re: ulimit setting

johnsonpk — Thu, 28 May 2009 12:39:02 GMT

Hi ,

The maxssiz & maxssiz_64bit are in bytes on kernel and ulimit give out put in kilobytes

can you post kmtune|grep -e "maxd" -e "maxs"

did you try to reduce it by ulimit -Sd ?

Thanks!!!
Johnson

Re: ulimit setting

ng_7 — Thu, 28 May 2009 13:11:30 GMT

thanks for your quick reply, I want to increase data and stack. the data is 2GB and stack is about 250mb, after I change the kernel
maxdsiz and maxdsiz_64bit to 3.5GB
and maxssiz to 400mb and maxssiz_64bit to 1GB ,

the ulimit -aH give output

data(kbytes) 4292870144
stack(kbytes) 392192

please see below for your requested info :

app:/# kmtune|grep -e "maxd" -e "maxs"
maxdsiz 3500000000 - 3500000000
maxdsiz_64bit 3500000000 - 3500000000
maxssiz 401604608 - 401604608
maxssiz_64bit 1073741824 - 1073741824

Re: ulimit setting

ng_7 — Fri, 29 May 2009 04:42:17 GMT

my HP-UX version

HP-UX tamcoapp B.11.11 U 9000/800 1725937685 unlimited-user license

is anyone know my problem ?

Re: ulimit setting

Dennis Handly — Fri, 29 May 2009 10:11:57 GMT

>anyone know my problem?

Your maxdsiz* and maxssiz* seem to be changed.
Now just run your application and ignore bogus values from ulimit.

>maxssiz to 400mb

This is way too big. You have reduced maxdsiz for default 32 bit apps to 600 Mb.