If I upgrade my VPS????

Yes Centmin Mod initial install auto optimizes the server configuration for detected server specs cpu/cpu model, memory, disk performance etc.

If you upgrade your VPS, you can do some of the auto optimizations again

For PHP-FPM, you can recompile PHP via centmin.sh menu option 5 so auto redetects memory and server resources and manually re-run /usr/local/src/centminmod/tools/setio.sh as follows

Code (Text):

/usr/local/src/centminmod/tools/setio.sh set

which will recalculate MariaDB MySQL innodb I/O variable values to set

i.e.

Code (Text):

/usr/local/src/centminmod/tools/setio.sh set
Full Reads: 24975
Full Writes: 59362

set innodb_flush_neighbors = 0

innodb_io_capacity = 2900

+------------------------+-------+
/etc/my.cnf adjustment
+------------------------+-------+
existing value:
Variable_name   Value
innodb_io_capacity      2700
innodb_io_capacity_max  5400
new value:
Variable_name   Value
innodb_io_capacity      2900
innodb_io_capacity_max  5800

+------------------------+-------+
innodb io threads adjustment
+------------------------+-------+
existing value:
+------------------------+-------+
innodb_read_io_threads = 2
innodb_write_io_threads = 2
+------------------------+-------+
new value:
+------------------------+-------+
innodb_read_io_threads = 2
innodb_write_io_threads = 2
+------------------------+-------+

Restart MySQL server for io thread changes