0

I manage a high-traffic(1200 request per min), large-scale WordPress website with a dedicated MySQL server. The server has 32GB RAM and a 16-core CPU ubuntu 22.04 LTS.

I've configured Apache and PHP-FPM with the following settings:

Apache (MPM Event) Configuration:

<IfModule mpm_event_module> StartServers 8 MinSpareThreads 32 MaxSpareThreads 96 ThreadLimit 32 ThreadsPerChild 32 MaxRequestWorkers 256 MaxConnectionsPerChild 10000 </IfModule>

PHP-FPM Configuration:

pm.max_children = 200 pm.min_spare_servers = 10 pm.max_spare_servers = 40 pm.max_spawn_rate = 32 pm.max_requests = 500

Each PHP-FPM process consumes around 200MB of memory. Initially, when checking with htop, memory usage is about 3.5GB out of 32GB. However, after 5-6 days, memory usage increases to 24GB, even though no other major services are running on the VM. It seems that Apache or PHP-FPM is not properly releasing memory.

After rebooting the VM again it down to the 3 to 4 GB and and next day when i checked it display around 5 -6 GB consumed. Ideally it should remain constant and I do not want to restaring the service or rebooting the VM at every week.

I've experimented with different pm and mpm settings, but the issue persists. How can I identify the root cause and optimize memory usage effectively?

Thank you.

Improve this question
2
  • max_children 200 * 200 MB = 40 GB. Commented Apr 2 at 8:58
  • @AlexD I already tried with making lower value around 100 to 120 as well. but still i am facing the same issue. Commented Apr 3 at 5:40

0

Reset to default

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.