Re: PHP - Best Appication Structure

[Thorbjoern Ravn Andersen <ravn@xxxxxxxxxx>]

Nathan Andelin skrev:
> Yes, Kevin also caught my Denmark bluper.  I meant Netherlands.  At least both countries are in Western Europe ;-)
>
> I'm trying to consider network latency.  A ping to Netherlands responds in 194 milliseconds.  A ping to Yahoo mail responds in 110 milliseconds.  A ping to a server on my LAN responds in 1 millisecond.
>
>   
I would suggest you look into the traceroute tool (tracert under 
Windows) which is very good for understanding where the delays happen  
(and hops invariably delay - your LAN server has no hops).

The output from here to "yahoo.com" looks like:

ravn:~ ravn$ traceroute yahoo.com
traceroute: Warning: yahoo.com has multiple addresses; using 209.131.36.159
traceroute to yahoo.com (209.131.36.159), 64 hops max, 40 byte packets
1  10.52.0.1 (10.52.0.1)  8.149 ms  8.839 ms  8.233 ms
2  10.250.10.2 (10.250.10.2)  8.882 ms  9.218 ms  8.951 ms
3  ge-0-1-0-721.900M.sltnqu1.ip.tele.dk (80.62.20.169)  9.473 ms  9.313 
ms  10.806 ms
4  xe-0-1-0.sltnxu4.dk.ip.tdc.net (83.88.12.82)  9.052 ms  10.229 ms  
13.718 ms
5  pos0-0-1-0.kd4nqh2.dk.ip.tdc.net (83.88.2.246)  102.098 ms  99.685 
ms  102.711 ms
6  pos0-0-0-0.alb2nqh2.dk.ip.tdc.net (83.88.23.102)  101.063 ms  
104.823 ms  105.897 ms
7  pos7-0-0.nyk2nxg1.us.ip.tdc.net (83.88.26.94)  100.870 ms  99.065 
ms  103.000 ms
8  equinixexchange-nyc.yahoo.com (206.223.131.16)  121.805 ms  99.481 
ms  100.348 ms
9  ge-2-0-0.pat2.nyc.yahoo.com (216.115.111.64)  99.132 ms  119.153 ms  
99.265 ms
10  so-3-0-0.pat1.che.yahoo.com (216.115.101.158)  122.268 ms  122.201 
ms  120.880 ms
11  as-1.pat1.dnx.yahoo.com (216.115.96.34)  175.218 ms  174.103 ms  
188.175 ms
12  as-0.pat1.sjc.yahoo.com (216.115.101.149)  220.709 ms  177.089 ms  
174.931 ms
13  ae1-p170.msr2.sp1.yahoo.com (216.115.107.85)  195.316 ms  179.014 ms 
ae1-p160.msr1.sp1.yahoo.com (216.115.107.61)  175.519 ms
14  te-8-1.bas-a2.sp1.yahoo.com (209.131.32.19)  177.833 ms 
te-9-1.bas-a2.sp1.yahoo.com (209.131.32.23)  180.543 ms 
te-8-1.bas-a2.sp1.yahoo.com (209.131.32.19)  178.767 ms
15  * * *
(* means no reply, no more came in after that - most likely that was the 
Yahoo firewall).

As you can see my first hop is 8 ms.  That is because it is a wireless 
connection.  The next major hop is from 4 to 5.  Most likely because 
thats the jump over the Atlantic, and then the rest is getting in 
through the yahoo servers to the actual servers (where they have an 
additional 80 ms delay).  Always fun to look at where the packets go :)