We''ve been working on some probes for Apache. So far, they are treating us very very well. You are all welcome to them: The patch against Apache-2.2.x (and apr-util) is available here: https://labs.omniti.com/trac/project-dtrace/browser/trunk/apache22/ with docs here: https://labs.omniti.com/trac/project-dtrace/wiki/ Applications#Apache2.2.x Best regards, Theo -- Theo Schlossnagle Principal/CEO OmniTI Computer Consulting, Inc. Web Applications & Internet Architectures w: http://omniti.com p: +1.443.325.1357 x201 f: +1.410.872.4911