Show hardware interrupts linux
Per-CPU interrupt counts, updated every second
watch -n1 'cat /proc/interrupts | head -30'
more linux
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Show process limits
cat /proc/<pid>/limits
Increase system file descriptor limit
ulimit -n 1048576 && echo '* soft nofile 1048576
* hard nofile 1048576' >> /etc/security/limits.conf
Show inode usage
df -i
Find large files
find / -type f -size +100M 2>/dev/null | sort
Show open file descriptors
cat /proc/$(pgrep myapp)/fd | wc -l