I'm looking for a way to monitor the system resources (CPU, memory, Disk I/O, etc) used by the PHP engine on a linux machine. I can't monitor it by the usual means (top, etc), since it runs as part of the apache process(es). Does anyone know if a tool exists from Zend, or a module for Apache, to monitor resource usage for internal subprocesses such as PHP? The machines I need to monitor are a cluster of load-balanced servers running Perl and mod_jk in addition to PHP, so that complicates things a bit. It was suggested to me on a message board to set up a similar test environment with just PHP and some kind of profiling built into all the scripts, but this would kind of defeat the point, since we're wanting to monitor production machines so that in the case they do down for whatever reason, we can see which applications spiked when and why. Sorry for the lengthy question, hope someone can help. Thanks for your time.
