Re: [Slashcode-general] performance/memory issues [was: Problems...] (fwd)

[Dave H. <da...@ho...>]

Nathan Vonnahme <na...@th...> writes:

> Delrin wrote to me only but I thought I'd share it with the whole list...


This is a "solved problem" as they say. Use a two-tier apache as laid
out in the mod_perl guide at http://perl.apache.org/guide

With a "lite" apache on the front, you don't care about concurrency as
the front apache processes free up the fat apache processes behind.

Read the book!


> 
> ---------- Forwarded message ----------
> Date: Wed, 06 Jun 2001 10:14:46 -0400
> From: Delrin Kenro <del...@ho...>
> To: na...@th...
> Subject: Re: [Slashcode-general] performance/memory issues [was:
>     Problems...]
> 
> 
> I had the exact same problems. This is due to the size of the "memory
> footprint" used by slashd, and even more importantly. Apache/mod_perl. I
> have a P3 500 w/128MB RAM, and redhat 7.0. I would say that this
> configuration is BARELY suited to running slash, but it can work if you
> have a low concurrency on your site.
> 
> Definately keep your min/max servers very low, don't bother with
> maxrequestsperchild, it won't help. Use ::SizeLimit if you can, I use it,
> though it doesn't work very well.
> 
> MinSpareServers 1
> MaxSpareServers 5
> 
> PerlFixupHandler Apache::SizeLimit
> 
> StartServers 1
> 
> Here's some of the settings I have that work quite well. BUT, also, make
> sure your system is dedicated for slash. What I mean by this is that
> there are no unnecessary processes running that take up memory.
> Especially things like Xfree. If you have a dual boot or something, set
> up a runlevel to work just for slash, that's what I did, and I have
> another to use Xfree.
> 
> The processes still get pretty huge, and consume more and more memory. At
> one time, my apache was taking 33MB of RAM for each process! My machine
> started to swap after a few days, and would just die.
> 
> Now here's what it looks like.
> 
> PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
> 
> 2967 nobody     0   0 10020 5172  4976 S     0.0  4.0   0:00 httpd
> 
> and for slash
> 
> 654 nobody     0   0 14028  13M  1744 S     0.0 10.9   0:44 slashd
> 
> 
> 
> 10MB and 14MB respectably. You can imagine if I was running say 10-12
> apache servers. :)
> 
> 
> 
> 
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> 

-- 
Dave Hodgkinson,                             http://www.hodgkinson.org
Editor-in-chief, The Highway Star           http://www.deep-purple.com
	  Interim CTO, web server farms, technical strategy
	       ----------------------------------------