The max number of simultaneous active connections

Hi. We have a 4x NT server running Weblogic 4.5.1 with the performance pack
enabled. We can only get about 7 or 8 active simultaneous connections in our
tests (using LoadRunner with 50 users). The app server log, on startup,
records that 8 native threads are assigned to the server. We are wondering
if there is a relationship here.
We have bumped up the "executeThreadCount" value from the default of 15 and
have not seen any change.
Thanks in advance.
Bill Kline

Hi Rob.
We are running on a 100Mbps network. It is alot of data though.
The servlet is to just drive our the backend components so we can have some
idea of their performance without the rest of the system there. We are still
seeing the same behavior with it. We are switching to a scenario with more
of our midtier components in place. This setup uses a JSP page that drives
an EJB that is the interface to the system.
There is still a possibility though that a servlet may come into play in
some scenarios.
- Bill
An EJB will be In a deploymnet there will be an EJB
Rob Woollen <[email protected]> wrote in message
news:[email protected]...
Bill Kline wrote:
Hi again Rob.
It appears that its something to do with the servlet that we wrote to
drive
the backend for the tests. I've enclosed a test servlet that is similar,
except it doesn't do anything except send back about 35K of data. Itshows
the same behavior as the one that actually drives our stuff (that isabout
35 TPS).
35K is a relatively large servlet response. Is this typical for your
application? Also, if I understand correctly, you are sending 35K / tx ** 35
trans / s which is ~ 1MB / s. What sort of network connection is thisover?
>
Let me know if you are still having problems.
-- Rob
The round trip (a transaction) is from load runner to the servlet (via a
POST) and the response from the POST.
Thanks for your help so far.
Bill Kline
[email protected]
Rob Woollen <[email protected]> wrote in message
news:[email protected]...
Bill Kline wrote:
Hi Rob.
Yes its a 4 CPU NT server.
The connections are not refused. They all get accepted, but only 7-8
are
actively being serviced, while the others wait.Can you provide some more detail about your architecture? Forinstance,
what is Load Runner measuring (ie what does a round-trip entail, what
is a
transaction?)
-- Rob
The CPUs are not busy. I
believe the max CPU utilization that has been recorded is around
60%,
but
its often lower (performance recoding is done using PerfMon). Our
main
concern is that we cannot max out the CPUs, so something isthrottling
things.
In the tests we can get about 30-34 transactions per second (tps)with a
transaction being a round trip recorded by Load Runner. The 30 tpsvalue
is
pretty consistent. If we crank up the number of users (say to 150)
we
still
get 30 tps, but the time for a transaction increases rather
dramatically
(to
over 10 seconds). The CPU utilization never really changes. The 30
tps
value
is also very consistent over time. We've run some 10 hour tests.
I was wrong on the "executeThreadCount" not making a difference. I
found
out
that increasing it to 50 from the default of 15 bumped up thetransaction
rate initially but only by a couple of percent. The rate fell afterawhile
back down to the magic 30 tps range. The fellow running the test
tried
an
executeThreadCount value of 300 once and saw no real affect.
Thanks for your time.
- Bill Kline
Rob Woollen <[email protected]> wrote in message
news:[email protected]...
Bill Kline wrote:
Hi. We have a 4x NT server running Weblogic 4.5.1 with the
performance
pack
enabled. We can only get about 7 or 8 active simultaneous
connections in
our
tests (using LoadRunner with 50 users).What happens when there are > 8 connections? Are the
connections
refused?
The app server log, on startup,
records that 8 native threads are assigned to the server. We arewondering
if there is a relationship here.No, not really. On NT, we assign roughly 2xcpu threads for
native
io
processing. I suspect that you have a 4 cpu system.
-- Rob
We have bumped up the "executeThreadCount" value from the
default of
15
and
have not seen any change.
Thanks in advance.
Bill Kline
Name: TServ.java
TServ.java Type: unspecified type (application/octet-stream)
Encoding: x-uuencode

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