On 08/10/2024 11:29, Alex wrote:
We run CraftCMS in OpenShift and have no limits defines, that means
that PHP can use the whole 8 CPUs and 32 GB RAM.
The Problem is that we see that PHP only uses ~200M-500M.
Have anybody some tips how to check what's the limiting factor in PHP
is so that we can tune it?
Do you have an actual performance problem (beyond "not using a lot of
memory") you're trying to solve? (If so, what?)
eg. Are specific requests "slow"? Are you getting error messages or
undesired behavior?
PHP won't use memory unless it's actually needed. The default
php-fpm/mod_php run model means that each request starts PHP scripts
from scratch with no knowledge of other requests. Most requests will
need no more than around 2MB of memory. More will only be required for
specific tasks such a working with image files or large imports/exports.
Individual PHP-FPM workers will only hold onto the maximum system memory
ever used by any request that specific worker handled (so resets if
either process idle timeout or max requests pm. settings are reached,
depending on which pm mode is used).
Unlike some server software (eg. databases), PHP doesn't keep a lot in
memory in the name of performance. This is something PHP scripts and
applications are expected to handle themselves - for example, by
utilizing caches such as memcached/redis/valkey or alternative
application architectures (long running application servers)
Given you're working with a specific application/framework (CraftCMS),
you may get better answers about configuration tuning or specific
performance issues from their community resources and support.
