[colug-432] ulimit

Rick Hornsby richardjhornsby at gmail.com
Fri Dec 2 11:52:46 EST 2011

We're running into some issues hitting FD limits, mostly running Websphere on RH5.5.

We've been able to raise the limit by adding entries to /etc/security/limits.conf for the user running Websphere, but still don't fully understand how the kernel counts how many FDs a user has open (websphere is the only thing running java but lsof -c /java/ | wc -l sometimes shows a value over the limit w/ no obv issues), if that is the right place to set it, and where the default of 1024 comes from?

Further confusing it for me at least is that ulimit is a bash builtin command, but the limits are enforced by the kernel?

Any insight would be helpful.


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