Okay, okay, not wanting to get into a big debate here - it was just a
suggestion based on things we've done quite successfully, but just to point out
a few facts...
> #1 it is quite likely that the DNS caching IS an issue, as who knows how PHP
> handles the
> DNS. (hence this is why it improved dramatically when the host was defined in
> the hosts
> file on the PHP server.)
Actually, the TCP/IP layer does the caching of IP addresses, not the
application layer. That's one of the reasons the entire Internet is as scalable
as it is. If every time someone makes a request, it has to revisit the DNS, the
whole thing would not be sustainable. Wanna see what hosts your computer is
currently caching? Just type ipconfig /displaydns into the command prompt.
> #2 Moving processing in the client is going to slow things down
> dramatically... you
> have (probably) 100Mbits between the 2 servers and what to the client
> exactly? 100k at
> best? You're doubling the number of requests on the slower link, effectively
> doubling
> your data transfer costs.
Think again. No matter what you do, you still basically have to move the same
amount of content down the narrow pipe to the user. Having a fat pipe between
the two servers is fine, but you still eventually have to get it down to the
user. Spreading out the load into 2 separate http requests may in some cases be
better (same reason why it's better to break up a large image into multiple
fragments).
#3 CPU load for including data is not that great.
That is true, provided the included content is at hand. Otherwise we wait till
it gets here.
Regards: Ayudh
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