Re: Understanding and Reacting to Top.

From: Darren Dunham (ddunham_at_redwood.taos.com)
Date: 10/24/05 

Date: Mon, 24 Oct 2005 18:51:32 GMT

Luke MacNeil <lukemacneil@listaintl.com> wrote:
> When I run top on this box, I can see 6 httpd processes each with a
> size of 148M... is the top "size" display directly related to memory?

Yes, it's the amount of virtual memory used by this process. You should
see a similar number (with much greater detail) by doing pmap -x on the
process.

> If it is, how can I possibly be running 6x148M processes just on apache
> alone?

Every page used by the process is not necessarily private to that
process. Read-only portions of the Apache binary may be shared among
all 6, and system libraries (like libC) may be shared by many programs.

The 'pmap -x <pid>' output shows that more explicitly. 

-- 
Darren Dunham                                           ddunham@taos.com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
         < This line left intentionally blank to confuse you. >

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