php-cgi high memory usage on 8GB server. Why?

[FabianoCardoso]

What is the best setup for my server?

Operating System: CentOS release 6.8 (Final) x64
CPU Model: Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz
CPU Speed: 8x 2400 MHz
PHP Version 5.4.45

php.ini:
memory_limit = 256M

Thx for your help, experts!

[robbyq]

What it? VPS?¿
Que es un VPS?

[FabianoCardoso]

Yes/Si.
http://www.hostinger.com.br/hospedagem-vps

[robbyq]

Yes/Si.
http://www.hostinger.com.br/hospedagem-vps

upgrade version and see if choose memorie /used memory high

[FabianoCardoso]

UPDATED!

Apache version: Apache/2.2.27
PHP version: 5.6.14
MySQL version: 5.5.52

php-cgi 100% 1.92 GB myserver (41)

My server works only with "UNDER ATTACK" mode activated in CloudFlare. 

[robbyq]

see logs for what happend. but if you have under attack the website, the company  vps we see logs...

[FabianoCardoso]

Migrate to MariaDB 10.1.18.
Working so fine!

Thx for all!