Re: [Webware-discuss] Webware process sizes

[Jason H. <ja...@pe...>]

On Tue, 2003-04-08 at 21:13, Hancock, David (DHANCOCK) wrote:
> Part of my question is probably naïve, but please bear with me.  The
> ThreadedAppServer process is, umm THREADED.  But on Linux (at least
> prior to RedHat 9.0),  threads are in fact lightweight processes.  The
> behavior that I see is that almost every one of the thread/processes
> has exactly the same virtaual size and same shared size and same
> resident-set size.  This leads to the first question:
> 
>         Does each thread consume the amount of memory it's reported to
> be using?

No, threads run in a _shared_ address space.  So don't multiply the
virtual size by the number of threads... it just looks that way.

> And then a specific question.  I'm running RedHat 7.3, Webware 0.8,
> and Python 2.2, Apache 1.3.2x, mod_webkit adapter.  I have the Min,
> Max, and Start threads  parameters set the same (to 30).  When I run
> the ThreadedApp, ps reports that each thread is using 288MB virtual,
> with a resident-set size of 22340.  Running top, on the other hand,
> shows that each thread is 22MB with resident-set size of 21MB.  The
> free command (and the headers for top) show that I'm only using about
> 520 MB of real memory; lots of real memory is untouched, and swap has
> never been touched.  This leads to my second question:
> 
>         Am I misinterpreting something about these numbers?  What's
> the true memory usage of the appserver?

The 22MB is shared by all threads in the process.  So the total memory
usage is 22MB.

-- 
Jason D. Hildebrand
ja...@pe...