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I have a Magento 2.3.4 website on my server in Production mode.
When I check memory usage with "top" command, I got a very high memory usage like this:
There are so many php-fpm processes
Can I kill php-fpm processes or do something in this situation?
Thank you!
If I'm reading correctly you only have 8GiB of memory. If your Magento instance gets a decent amount of traffic and/or you're not serving your static files (css and js) from a CDN, Magento 2 will eat up your memory pretty quickly.
If you just want to ensure you're only spawning php-fpm workers as needed you can edit your php-fpm pool configuration file www.conf. The location of this file depends on the Linux distro you're using, for instance on Ubuntu Server this file is located at /etc/php/<php version>/pool.d/www.conf. Once you find the file open it and edit the following configuration options.
NOTE: These options are already present in the file so you'll need to find them and update the value, don't just paste this into the file
pm=dynamic
pm.max_children=20
pm.start_servers=10
pm.min_spare_servers=5
pm.max_spare_servers=15
Note the values for pm.max_children, pm.start_servers, pm.min_spare_servers, and pm.max_spare_servers will more than likely need to be tweaks to your needs, and the values I provided are on the low side.
Now you just need to restart your php-fpm process for the changes to take effect.
When pm is set to dynamic the php-fpm master process will spawn php-fpm workers as needed based on the values set above. When pm is set to static the php-fpm master process will always spawn the the maximum number of workers allowed based on the value of pm.max_children
