Having problem with Php fpm
Ok My site is working fine but when the number of visitors increases it breaks suddenly.To find out why it breaks I have been observing the behaviour of my server using the 'htop' command.
Using 'htop' I noticed that whenever the second value in the figure,
code Tasks 136 , 100 , 2 running
reaches 166 my site breaks,I get something like " 502 Gateway error" .The problem seems to be not coming from RAM because the RAM usage is just 4 to 5 GB but I have 16GB RAM.And also the CPU usage never reaches 100%.So where is the problem coming from? can anyone help me please!
My Server is information:
16GB RAM, 320 GB storage , 6 CPU
My NGinx configuration is :
worker_processes 6; worker_connections 2000;
My PHP fpm configuration is :
pm = ondemand pm.max_children = 100 pm.start_servers = 18 pm.min_spare_servers = 9 pm.max_spare_servers = 18 pm.process_idle_timeout = 10s; pm.max_requests = 500
Am I missing something,I also use WP Super cache!!
Any help will be grateful,thank you in advance.