Ulimit value

[ThanseerK]

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.

[Matti_Kurkela]

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

[Kapil Jha]

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

BR,
Kapil+

[ThanseerK]

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.

[Don Morris_1]

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).

[Bill Hassell · Accepted solution]

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.

[ThanseerK]

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