Check the open FD limit for a given process in Linux

Question

I recently had a Linux process which “leaked” file descriptors: It opened them and didn\'t properly close some of them.

If I had monitored this, I could tell – in adv

Answer 1

In CentOS 6 and below (anything using GCC 3), you may find that adjusting the kernel limits does not resolve the issue. This is because there is a FD_SETSIZE value that is set at compile time in use by GCC. For this, you will need to increase the value and then re-compile the process.

Also, you may find that you are leaking file descriptors due to known issues in libpthread if you are using that library. This call was integrated into GCC in GCC 4 / CentOS7 / RHEL 7 and this seems to have fixed the threading issues.