I have one site under Prestashop (LAMP platform), the sole website hosted on a dedicated server, but in recent monthes it has gottent slow, and sometimes the mysql server crashed. I don' t know where to start, i just know that php-cgi was also the culprit.
i made a free -m and here is the result
$ free -m total used free shared buffers cached Mem: 7977 7800 177 0 1 3193 -/+ buffers/cache: 4605 3372 Swap: 975 751 224
it seems there's a lot of memory consumption !
FYI i used to install nginx in the beginning, but now it is removed completely and i restarted the server. Where should i start to investigate? thank you