In http://www.virtualmin.com/node/8462#comment-48251 there is allusion to a serious sounding issue with mod_php. So I am using fcgid for about 35 web hosting clients on my VPS. Rimuhosting is telling me that I am runing out of memory, partly because "you have a lot of instances of php-cgi being spawned by apache".
Is this mod_php information valid? It does seem that would break some apps due to SuExec, etc. Can this issue be fixed? Is there any data about the difference in RAM footprint between mod_php and the CGI variants? This would help me scale my VPS.