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From Tony Clayton <tony-mod_p...@clayton.ca>
Subject Re: maintaining shared memory size (was: Re: swampedwithconnection?)
Date Tue, 30 Aug 2005 07:27:49 GMT

Quoting Badai Aqrandista <badaiaqrandista@hotmail.com>:

> 
> >
> >Then how do you know what to write in C?
> >
> 
> I have localized one subroutine that has been heavily called in the
> search 
> function. That should be the way to pick the candidate, shouldn't
> it?
> 
> I have never done this and I am worried that writing it in C would
> push the 
> project's deadline a little bit further. However, does anyone have
> any hint 
> on doing this? What are the recommended readings?
> 
> Anyhow, I've decrease the MaxClients to 3 and it worked!!! The speed
> 
> significantly increases, from average of 110 sec/request to 85
> sec/request. 
> But, that's not enough. I need less than 10 sec/request.
> 
> Is that possible without changing hardware?

I see from an earlier post on the mason-users list that your app is
using HTML::Mason and Apache::Session::Memcached.  It seems like you've
got quite a few variables to juggle in your performance bottleneck
analysis.

Have you tried switching to, say, Apache::Session::MySQL to see if
there
 is any difference?

You can also try these measures with your app:
- Use static source mode in mason, and preload components:
  http://masonhq.com/docs/manual/Admin.html#static_source_mode
- Preload (some/all) of your perl modules in the httpd parent using the
PerlModule apache directive
- If you are connecting to a database, be sure to use Apache::DBI

One cheap way to check for memory leaks (most probably introduced by
your perl code if they exist) is to run httpd -X (non-forking mode) and
watch the memory usage of httpd while you send some requests.  

You may also want to strace the process: 
# httpd -X &
# strace -o /tmp/strace.out -p `pidof httpd`
# tail -f /tmp/strace.out

Then hit the server with some requests and watch the strace output. 
This is especially useful for finding I/O or IPC bottlenecks.

good luck
Tony



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