High memory usage

[Miguel G]

I have Centos 6.8 with WHM 62 updated to the latest version.

I have suphp as php handler for PHP 5.6 and 7.0. I have just installed fcgi for PHP 7.1 and opcache and do some tests to see if I can improve speed.

I have followed these instructions:

Apache Module: FCGId - EasyApache 4 - cPanel Documentation

I´m not seeing any speed improvement by using Opcache with a https site I´m using for testing and I´m checking the server configuration. It´s a VPS with 19 Gb of RAM.

I have noticed nscd dns cache service is taking around 2 Gb of RAM (versus 800 Mb when restarted). I have set the restart interval to 1 hour but still the service RAM usage is growing so it seems the service is not being restarted.

I also have noticed two httpd processes that are eating up around 2 Gb of RAM each (even after restarting httpd service):

22821 nobody 20 0 1929m 78m 8320 S 5.0 0.4 0:17.57 1.7g httpd
22994 nobody 20 0 1929m 77m 8364 S 5.6 0.4 0:18.29 1.7g httpd

And also I see a huge memory reserved for caching:

root@myserver [~]# free -ah
total used free shared buffers cached available
Mem: 18G 18G 377M 140M 825M 13G 0B
-/+ buffers/cache: 4.0G 14G
Swap: 3.9G 154M 3.7G

even if my swappiness is set to 25

 

[Miguel G]

By the way, my apache settings:

Start Servers 5
Minimum Spare Servers 5
Maximum Spare Servers 10
Server Limit 256
Max Request Workers 50
Max Connections Per Child 1000
Keep-Alive On
Keep-Alive Timeout 5
Max Keep-Alive Requests 100
Timeout 100

 

[cPanelMichael]

Hello,

I'll leave this thread open for user-feedback, but I did want to reference the following thread regarding memory usage on Linux systems:

Memory usage apparently higher than expected

Thank you.

 

[Miguel G]

Thanks for your input.

But still nscd service is eating up memory, some people suggest to restart it every hour but I´m wondering if there is any better solution.

Anyway, the main issue here is:

- Opcache and FCGI not offering much improvement in terms of speed.
- 2 Httpd processes using almost 4 Gb of RAM.

 

[cPanelMichael]

Feel free to open a separate thread for the NSCD issue and we can take a closer look. It's typically not a problem if your server is utilizing RAM due to the nature of how memory is utilized, unless you are noticing performance issue or reaching the memory limit.

Thanks!

 

[Miguel G]

Ok, I will.

Is there any information about how to configure properly fcgi? Do I need to enable php-fpm in MultiPHP Manager? I feel that I´m missing information.

 

[cPanelMichael]

Hello,

EasyApache 4 supports FCGId without a PHP-FPM implementation:

Apache Module: FCGId - EasyApache 4 - cPanel Documentation

PHP-FPM is enabled independently of FCGId and is enabled per virtual host:

PHP-FPM - Documentation - cPanel Documentation

Thank you.

 

[Miguel G]

I have already referred to that fcgi documentation in my thread.

there isn´t the claim that this implementation surpases in speed to suphp? I´m now testing php-fpm with opcache to see if it is better in terms of speed.