oversized httpd process?

[Lei Sun]

Now that I think about it, I did install the eaccelerator for php, and
configured it to take 128Mb for eaccelerator.shm_size. It also appears
that when I reboot the machine A without pointing my browser to it
once, the httpd processes are quite small. BUT...

Even with the 2 php application that I installed (phpmyadmin,
mediawiki), I don't think there should be that much caching going on.
Since if I add the total size of the 2 application together, they
won't even hit 20MB. In other words, my understanding would be: even
if eaccelerator wants to cache them all, eaccelerator wouldn't be able
to find that much stuff to cache, and it would always be less than
20MB.

Am I expecting the right thing?


On 8/24/05, Dan Nelson <dnelson at allantgroup.com> wrote:
> In the last episode (Aug 24), Lei Sun said:
> > I saw many posts from google regarding to this question, but there
> > were no definite answers..
> >
> > some say, it's mod_ssl, some say it's mod_perl, some say it is mm.
> > But my case, it just doesn't make much sence to me at all.
> >
> > Here are the 2 test machines that I have, both have the exact same
> > configuration
> >
> > A is a lot more powerful than B
> >
> > machine A, p4 3.0 2GB Mem
> > machine B, p2 450Mhz 128MB Mem
> >
> > Both have mod_php, mod_ssl, and no traffic has been sent.
> >
> > Looking at the httpd sizes, I start to wonder ... How come Machine B
> > only uses around 15Mb per httpd, while machine A takes 155Mb, and
> > while they have exactly the same software, same configuration.
> 
> Try running lsof on both processes.  Since SIZE is 155M but RES is a
> lot smaller, there may be a large file being mmapped by one system and
> not the other.
> 
> > machine A:
> >   PID USERNAME PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
> >   440 root      96    0   155M 17412K select 0   0:02  0.00%  0.00% httpd
> >
> > machine B:
> >   PID USERNAME PRI NICE   SIZE    RES STATE    TIME   WCPU    CPU COMMAND
> > 50855 www       20    0 16348K    12K lockf    0:00  0.00%  0.00% httpd
> 
> --
>         Dan Nelson
>         dnelson at allantgroup.com
>