Solaris 10 - file descriptors changing values -

Posted on 2014-02-21
Last Modified: 2014-02-25
Hi experts.

What is the real value of file descriptos?
Using oracle user to enter the server and it is the working user in this case.
I need this to be 4096, but Unix system Admin told me, the number is 8192.
Oracle is telling me that it is not set to 4096.
Who has the truth, and how to change if it is not set?

For our Cloud Control agent, we need files descriptors should be 4096
Once you do the changes, please restart the agent and monitor.

pasatimeDB:/export/home/oracle/product/agent/agent_inst/bin> prctl -n process.max-file-descriptor  -i process $$
process: 10343: -ksh
NAME    PRIVILEGE       VALUE    FLAG   ACTION                       RECIPIENT
        basic             256       -   deny                             10343
        privileged      8.19K       -   deny                                 -
        system          2.15G     max   deny                                 -

/export/home/oracle/product/agent/agent_inst/bin> ulimit -a
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         unlimited
stack(kbytes)        8192
coredump(blocks)     unlimited
nofiles(descriptors) 256
vmemory(kbytes)      unlimited

/export/home/oracle/product/agent/agent_inst/bin> cat /etc/release
                   Oracle Solaris 10 1/13 s10s_u11wos_24a SPARC
  Copyright (c) 1983, 2013, Oracle and/or its affiliates. All rights reserved.
                            Assembled 17 January 2013
Question by:LindaC
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LVL 68

Expert Comment

ID: 39876654
Hi Linda,

The important thing is the the file descriptor limit of the concerned user which is 256 in your case.

You should try to raise this limit by means of "ulimit -n 4096"

If this fails you will have to ask your system admin to raise at least the "hard limit" for file descriptors of this user to 4096.
Better have them also raise the "soft limit" so the right value will be set at login which gets you rid of the need to add the ulimit command to the user's profile.
LVL 22

Expert Comment

ID: 39876675
You can just set the limit you need for the process using the prctl command.

Author Comment

ID: 39876681
Is this going to be persistent if I quit the session?  And how can I change it if I'am login as Oracle?
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LVL 68

Expert Comment

ID: 39876962
@LindaC - who is the adressee of your last questions above?

Author Comment

ID: 39877138
LVL 68

Assisted Solution

woolmilkporc earned 100 total points
ID: 39877726
All that follows applies to a regular user, e.g. "Oracle".

"ulimit -n 4096" (if allowed) will not persist across sessions, but I think it's good for testing anyway.

To make it "persistent" you must either

- add the above statement to the "Oracle" user's  .bash_login (for login shells) or  .bash_profile,  .bashrc or .profile (fallback if none of the previous files exists)  whatever is your standard.

- ask your system admin to raise the soft limit for nofiles (descriptors) of the Oracle user to 4096.

If "ulimit -n 4096" is not allowed due to hard limit restrictions you must ask your system admin to raise the "nofiles" hard limit  as well as the soft limit  to 4096.

If "ulimit" isn't useable at all or has no effect in your environment let's hope that "blu" drops in again to explain how to use "prctl" in this case.

Author Comment

ID: 39877730
Thank you.

Expert Comment

ID: 39877792
ulimit is legacy and solaris has better way of managing system resources, via projects.

You can ask your system administrator to run following command to add a project for Oracle user and specify maximum file descriptor size. this will be permanent and you can apply change to all current running process as well as new process, so you don't even need to restart oracle database.
#projadd -U oracle -K “process.max-file-descriptor=(priv,4096,deny)”

For applying this change to all current running process:

#for p in `ps -o pid -u oracle`; do
#newtask -p -p $p

To see current value for file descriptor for current shell run this:

prctl -n process.max-file-descriptor $$

Author Comment

ID: 39877813
Reza_a thank you.
What the system Admin told me is that the oracle user is a "privileged"user and it is already set to 8192.
Oracle Company said is not set because when I ran as oracle user ulimit -a it gave 256

pasatimeDB:/export/home/oracle> prctl -n process.max-file-descriptor $$
process: 13020: -ksh
NAME    PRIVILEGE       VALUE    FLAG   ACTION                       RECIPIENT
        basic             256       -   deny                             13020
        privileged      8.19K       -   deny                                 -
        system          2.15G     max   deny                                 -

Accepted Solution

Reza_a earned 400 total points
ID: 39877863
As you can see there are three values you can define in file-descriptors:
basic: is equal to soft limit
privileged: is equal to hard limit
system : is maximum number can be used by system

for you case you need to to change basic value, you can change it yourself but to make it permanent ask your system administrator to run following command

projmod -U oracle -K “process.max-file-descriptor=(basic,8192,deny)”

Author Closing Comment

ID: 39886643
Thanks so much Reza_a.

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