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Number of max open files for a process stays low

I have a process running on a ubuntu under a user which its ulimit is 400000 for both -Hn and -Sn options. The /etc/security/limits.conf value for that user is 100000. However, when I execute cat ...
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Meaning of FDSize in /proc/PID/status

I'm looking for a way to find out the open FD limit under Ubuntu machines which doesn't have the /proc/PID/limits, namely EC2 machines. I have been looking into /proc/PID/limits, and found the the ...