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lamp centos 5.8 suddenly out of memory

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http://serverfault.com – This system is running Centos 5.8 final using 2.6.18-308.4.1.el5 as a virtual machine on VMware ESXi 5. Standard LAMP install, running three instances of Wordpress. Server has been running for a couple of years and never had any issues, then today httpd crashed twice with out of memory messages and hoses pretty much everything else in the process with the VM becoming unresponsive. Here's the top output while the system is still running OK sorted by memory usage: top - 19:54:19 up 8:05, 1 user, load average: 0.00, 0.01, 0.03 Tasks: 88 total, 2 running, 86 sleeping, 0 stopped, 0 z (HowTos)