Originally posted by: CTSUnix

#ulimit -a
core file size          (blocks, -c) 1048575
data seg size           (kbytes, -d) 2097152
file size               (blocks, -f) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) unlimited
pipe size            (512 bytes, -p) 64
stack size              (kbytes, -s) hard
cpu time               (seconds, -t) unlimited
max user processes              (-u) 16384
virtual memory          (kbytes, -v) unlimited

Originally posted by: CTSUnix

Hello Experts,

Ulimit value (data seg size and max user process) is getting changed when switching the shell from ksh to bash in AIX 7.1.

Please find the below output for your reference.

elrep:!:604:207:Application User:/elappbin/elrep:/usr/bin/ksh

#id

uid=604(elrep) gid=207(comptel) groups=1(staff)

#ulimit -a
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         unlimited
stack(kbytes)        4194304
memory(kbytes)       unlimited
coredump(blocks)     2097151
nofiles(descriptors) unlimited
threads(per process) unlimited
processes(per user)  unlimited

#bash

#id

uid=604(elrep) gid=207(comptel) groups=1(staff)

#ulimit -a
core file size          (blocks, -c) 1048575
data seg size           (kbytes, -d) 2097152
file size               (blocks, -f) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) unlimited
pipe size            (512 bytes, -p) 64
stack size              (kbytes, -s) hard
cpu time               (seconds, -t) unlimited
max user processes              (-u) 16384
virtual memory          (kbytes, -v) unlimited

Let me know, how to keep the same ulimit value (data seg size  & max user process) for a user in ksh and bash shell.

Originally posted by: AyappanP

We will look into this.

In the meanwhile, i think you can use .bashrc & .kshrc file to maintain the same values for the user.

Originally posted by: CTSUnix

Hi,

Thanks for your support.

Can you please let me know, how can I set ulimit values in .bashrc file.

Originally posted by: AyappanP

Just put it like this.

ulimit -d unlimited

ulimit -u unlimited 

Originally posted by: CTSUnix

Thanks for your suggestions.

I have set the ulimit value as suggested in .bashrc file. For "ulimit -d" it got changed to unlimited.

But for "ulimit -u" it is not getting changed and getting the notification "bash: ulimit: max user processes: cannot modify limit: A system call received a parameter that is not valid" message while switching to bash shell.

Please fidn the below output for your reference and let me know, hwo to fix it.

user@PEC:/home/user>#cat .bashrc
ulimit -d unlimited
ulimit -u unlimited
user@PEC:/home/user>#

user@PEC:/home/user>#echo $0
-ksh
user@PEC:/home/user>#ulimit -d
unlimited
user@PEC:/home/user>#ulimit -u
unlimited
user@PEC:/home/user>#bash
bash: ulimit: max user processes: cannot modify limit: A system call received a parameter that is not valid.
user@PEC:/home/user>#echo $0
bash
user@PEC:/home/user>#ulimit -d
unlimited
user@PEC:/home/user>#ulimit -u
16384
user@PEC:/home/user>#

Originally posted by: AyappanP

Which version of bash is installed ?

rpm -qa | grep bash

bash --version 

Originally posted by: CTSUnix

user@PEC:/>#rpm -qa |grep -i bash
bash-4.4-4
user@PEC:/>#bash --version
GNU bash, version 4.4.12(1)-release (powerpc-ibm-aix5.1.0.0)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

 

Originally posted by: AyappanP

The bash you are using is not from AIX Toolbox. 

Can you try the latest bash 5.0 from AIX Toolbox and check whether the problem exists ?

Originally posted by: CTSUnix

Hi,

When I'm trying to install the (bash-5.0-1.aix6.1.ppc.rpm) it is asking for multiple dependency packages.

Kindly let me know, is there any option to fix (ulimit -u issue) in current version.

Originally posted by: AyappanP

In the current bash 5.0, i see the ulimit -u ie., the max user process ulimit value gets inherited from ksh shell. 

I am not sure why it is not happening in your bash 4.4 version. And max user process limit you can increase only with root privileges. 

Originally posted by: CTSUnix

Getting below mentioned package dependencies while trying to install bash-5.0-1

root@:/mnt/aix/bash>#rpm -hUv bash-5.0-1.aix6.1.ppc.rpm
error: failed dependencies:
        libiconv >= 1.14-1 is needed by bash-5.0-1
        libiconv.a(libiconv.so.2)   is needed by bash-5.0-1
root@PEC:/mnt/aix/bash>#rpm -ivh libiconv-1.14-1.aix6.1.ppc.rpm
error: failed dependencies:
        gettext >= 0.19.8.1-1 is needed by libiconv-1.14-1
        libintl.a(libintl.so.8) is needed by libiconv-1.14-1

And max user process limit you can increase only with root privileges.

==> It is unlimited for root and other users in kshell, but not getting inherited for bash shell. I have put the "ulimit -u unlimited" in my current user home directory bash shell. Then I'm getting this notification "bash: ulimit: max user processes: cannot modify limit: A system call received a parameter that is not valid." while changing the shell from ksh to bash. Any idea, how to fix it.

Let me know, how to fix the package dependency issue while upgrading to bash -5.0-1.

Originally posted by: AyappanP

Please use Yum to install packages. It will automatically resolve the dependencies. 

How to configure yum in AIX --> https://developer.ibm.com/articles/configure-yum-on-aix/

Originally posted by: CTSUnix

Thanks alot for your support and solution.

Ulimit vlalue inheritance issue was due to bug in current bash version. After upgrading the same to bash-5.0-1, issue got fixed.

I have used below order to resolve the package dependency issue during bash package upgrade. Because yum has not configured in our setup.

rpm -ivh gettext-0.19.8.1-3.aix6.1.ppc.rpm --nodeps
rpm -ivh libiconv-1.14-1.aix6.1.ppc.rpm

rpm -hUv bash-5.0-1.aix6.1.ppc.rpm