Re: IceBreak as an alternative to Apache?

I am not sure what the max clients is, but I do know that when I have done
testing with JMeter I hit the TCP layer bottleneck before I hit the OS job
limitation. Actually, that was a test for stateless transactions. I
basically spun up a couple hundred Apache jobs and hit it hard with JMeter.
That's when things started falling apart and I had to call IBM. They of
course told me it was my software, so I had to put together a bare bones CGI
app and prove it wasn't. Then they got one of the higher level devs on and
they pretty much determined it was at the TCP layer. You can adjust the TCP
layer settings, but they recommended against it.

I know a million connections is a lot, but I am dreaming big for some social
media type applications I have up my sleeve :-) I guess if I ever did get
over a couple thousand concurrent connections that I would want to have
multiple servers at different geographic locations because it would probably
mean I hit the jackpot! ;-)

Aaron Bartell


On Fri, Dec 31, 2010 at 1:30 PM, Joe Pluta <joepluta@xxxxxxxxxxxxxxxxx>wrote:

Actually, I'm not sure where I got the 65000 number. I think I was
thinking about the maximum number of ports per IP address.
Realistically the limit on concurrent stateful sessions is the number of
simultaneous processes that you can have being served from the same IP
address, and I think that number is actually pretty low. It gets a
little fuzzy; I think the number is controlled by the MaxClients setting
and that number is rarely set above 1000, but maybe Aaron knows more.

Joe

But this is a little bit of a red herring. The real limitation is that
you can only have 65,000 connections on an IP address. If you have over
65K connections, you need multiple IP addresses and once you have
multiple IP addresses, you automatically have a way to segment the load
among multiple servers. So even if you were trying to run Amazon on an
IBM i, you could do it.

Joe

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