Httpd process consuming loads of memory

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http://serverfault.com – I have a server which is giving me headaches. It hosts a couple of sites: these are either php based, or java based. I have a setup that uses apache2 + suPhp for the php sites, and apache2 + mod_proxy + apache tomcat for the java applications. I've been seeing some strange behaviour over the past few weeks. Sometimes, I get a single httpd process that spikes to 30-40% cpu, and well over 70% memory. I don't see any php or java process taking up extra resources, so I (naively) assume that the problem is not related to the php or java code. These spikes seem to happen at random times and with ra (HowTos)