This is a simple plugin to show how much memory (virtual size as
reported by ps) the PHP FastCGI processes are using. It reports
also the number of processes. That value is specified as an
environment variable to the php-cgi program PHP_FCGI_CHILDREN,
usually set in the startup (init) script that launches the FastCGI
daemon.
Although the number of processes is show in the graph, it’s more or
less useless since the memory usage uses a 100s (MB) or 1000s scale
(GB), hence dwarfing the processes value. Nevertheless the average,
maximum and minimum values are shown below the graph, thus
providing useful information. I don’t think that a separate graph
makes much sense. After all, the value of PHP_FCGI_CHILDREN
defines its upper limit.
Copy the php_fcgi file to the /etc/munin/plugins directory. Try
it with munin-run php_fcgi. It should report the memory and
number of processes.
Perl with the POSIX module.