topic Re: Ulimit value in Operating System - HP-UX

Ulimit value

ThanseerK — Thu, 19 Nov 2009 01:11:09 GMT

I have a hp ux 11.23 system. I need to increase the nofiles ulimit value to double the size.
ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 2015464
stack(kbytes) 131072
memory(kbytes) unlimited
coredump(blocks) 4194303
nofiles(descriptors) 4096

I can able to increase it using the command #ulimit -n 8192
But it is changing it to the old value once i exited from the shell. Can anyone suggest the procedure for setting this value permanently.

Re: Ulimit value

Matti_Kurkela — Thu, 19 Nov 2009 02:31:28 GMT

For one user only: add the ulimit command into the .profile script for that user.

For all users: add the ulimit command to /etc/profile.

For all users, may require a reboot: adjust the "maxfiles" kernel parameter to set it to a new system-wide default.

MK

Re: Ulimit value

Kapil Jha — Thu, 19 Nov 2009 07:54:04 GMT

for user specific change .profile
for all users change in profile file.

BR,
Kapil+

Re: Ulimit value

ThanseerK — Thu, 19 Nov 2009 21:32:05 GMT

Hi Matty,

Thanks for your reply.

Does this maxfiles is static or dynamic. My sam window doesn't show whether it is static or not.

Re: Ulimit value

Don Morris_1 — Thu, 19 Nov 2009 21:36:36 GMT

Static.

http://docs.hp.com/en/B2355-60103/maxfiles.5.html

(or you could just do "man maxfiles" on your v2 box... all public tunables on v2 and higher are supposed to have man pages provided for just this reason).

Re: Ulimit value

Bill Hassell — Fri, 20 Nov 2009 01:40:27 GMT

There are two kernel parameters for nofiles: maxfiles and maxfiles_lim. The maxfiles value is what ulimit -a reports without modification. You can raise the value up to the hard limit of maxfiles_lim. However, your system manager may have followed poor documentation from an application vendor which said to make maxfiles=maxfiles_lim. That of course defeats the entire purpose of having a soft limit (maxfiles) for most users and processes, and a hard limit (maxfiles_lim).

If you need 8192 files open at the same time inside one process, then maxfiles_lim must be raised to at least 8192. maxfiles and maxfiles_lim are dynamic and can be changed without a reboot.

Re: Ulimit value

ThanseerK — Tue, 08 Dec 2009 07:47:12 GMT

i have used sam to change the maxfiles_lim and maxfiles_size parameters and after reboot my system is fine now