Basic System Tuning

Increase "Open Files Limit"

If you see something like this in log files when you go big:

Accept error: accept tcp [::]:8080: accept4: too many open files; retrying in 1s

then your pool hitting max open file limit allowed by Linux. The solution for this problem is simple.

Assuming you are running a pool process under pool user. Create a file /etc/security/limits.d/pool.conf:

pool soft nofile 512000
pool hard nofile 512000

Once you save file, you may need to logout and login again and restart pool process.