Re: performance very differently for two hosts that are configured identical

Zhang Weiwu wrote:
> We have a development server 'emerson' with roughly one third of the
> performance of our productional server 'bossdog', it runs ldap query 10
> times faster than the productional server. I checked everything I can to
> find out the difference, it seems both are equally configured.
>   
<snip>
> This performance difference resulted the productional server user
> interface much slower than user's patience.
>
> What would you check further in this case? Thanks in advance!
>   
Two ideas :

1) Check the code that send requests to the prod server. It might 
receive many more requests than expected
2) Check the network latency. This is most certainly what kills your 
performances : firewalls, load balancers, etc are adding some latency 
you don't see on your dev server because you are not using them on dev.

I would bet for (2). I have experienced the very same problem for one of 
my client 2 months ago. A F5 round up was adding 3ms latancy for each 
request, enough to slow down the whole server so much that the dev 
server was running 5 times faster than the production server.

-- 
--
cordialement, regards,
Emmanuel Lécharny
www.iktek.com
directory.apache.org