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What command can I type with Linux where I can watch Apache HTTP web server load in real time?

BACKGROUND: I can type 'top'. That let's me watch overall server load (just look at inverse of Idle % and consider it over a period of time). However, I need to know how to see when Apache is running into critical load and may run out of process handles or something like that.

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up vote 1 down vote accepted
  • apachetop is an open source initiative for monitoring the apache server itself
  • wtop/logrep is an open source initiative for retrospective analysis and realtime serving performance monitoring
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mod_status (docs) provides a web-accessible list of Apache processes and the requests they're handling.

Example output:

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