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Check number of file descriptors opened by process

Fri, 03/25/2011 - 11:51 — sandip

To check on the file descriptors opened by process:

lsof -p {PID} | awk '$4 ~ /^[0-9]/ {print $4}' | wc -l

alternately:

ls -1 /proc/{PID}/fd | wc -l

To check all file descriptors opened by a user:

lsof -u {user} | awk '$4 ~ /^[0-9]/ {print $4}' | wc -l

By default the hard and soft limits for a single process are set to 1024 on linux systems. To check on the limits:

ulimit -Hn
ulimit -Sn

To increase edit the "/etc/security/limits.conf" file for corresponding user:

{user} soft nofile 4096
{user} hard nofile 4096

To check if the new limits has been applied type `ulimit -n` after you get a new shell.

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