tovaldez wrote:
On Friday 23 January 2009 20:04:40 Christopher Schultz wrote:
tovaldez wrote:
Hi,
monitoring our webapp while running load testing, I noticed that the
number of the effective users browsing the site is more than the number
of opened sockets in ESTABLISHED state (while under a 240 Virtual Users
load, I see only 180 ESTABLISHED connections, or 2000VU vs 450 opened
sockets).
At first I think this is due to some TCP socket reuse optimization by
the JVM or the OS. Could someone confirm this idea or give me another
interpretation of this behaviour?
Er... "effective users" ~= sessions, right? Not all users are actively
making requests all the time so... the number of effective users is
pretty much always higher than the number of in-use TCP sockets.
Am I missing something?
-chris
Actually HTTP sessions >> effective users, since each user has a 10 minutes
simulated navigation but the HTTP session is lasting a lot more (I think 1 hour by
default in tomcat).
What I thought was that using HTTP 1.1, I would have only 1 phisical connection
to the server for each user... This seems not to be, as if the same physical
connection is used contemporarily by more clients.
I am asking if it could be a poor testing design or if we are wrong in our
consideration...
1. Last I knew the default session length in tomcat is 30 minutes, but
can be changed on a per webapp basis.
2. I believe most browsers open two TCP/IP connections per site and use
them both to download the page and all it's resources. Keep in mind
some clients either by design or by hacking could open more.
--David
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