https://stackoverflow.com/questions/17341800
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RussianI'm a bit rusty with my AIX, but it doesn't sound like you're setting your ulimits correctly. I don't believe you can simply say "ulimit="; you need to tell it which ulimit you want to set. For example, to set specify the max number of open file descriptors for a process, you would do: ulimit -n 2000
To answer your specific questions:
Your default ulimits are set in /etc/security/limits. There is a soft limit and a hard limit. The soft limit is the current setting, whereas the hard limit is the maximum it may be set to. That being said, Weblogic can "override" the soft limit so long as it does not exceed the hard limit.
I'm not sure what you're asking here. You can display current ulimit settings by running "ulimit -a"
This really depends on your environment and what you're doing. It's generally unwise to set your ulimits to unlimited for the very reason you're asking this question: you can get bad results if you exceed your system resources. I know companies like Oracle will tell you to set everything to unlimited, but that is poor system administration in my opinion.
The file descriptor value (-n) is completely separate from stack size, etc... Whether you need to tweak the other ulimits really depends on what you're doing. I know that in our WebLogic environment, we did set the maximum file size ulimit (-f) to unlimited, against my better judgment, while making minimal changes, if any, changes to the other limit settings. I do believe we had to increase the nofiles descriptor to 2000, as you mentioned.
So back to your bigger question/problem. It sounds like you're simply not setting your ulimit correctly for nofiles (-n). It sounds like it needs to be increased, perhaps to 2000 as you said. Try adding "ulimit -n 2000" to your commEnv.sh, but make sure that does not exceed your hard limit or it won't work.
I hope that helps.
