On 20/03/06, sebb wrote:
On 20/03/06, Erik Lindegren <[EMAIL PROTECTED]> wrote:
I have a strange problem with jmeter at the moment.
I'm trying to overload an apache server on my local network.
I'm using 3 computers: one for the apache server, and the remaining
two for running remote jmeter servers.
When I've been running my test for about 40-50s both of the jmeter
servers stop sending http-requests to the apache server.After about
30-40s the jmeter servers start sending requests again, but after a
while they go down again, and so it continues.
Any messages in the jmeter.log files?
There are no messages in the log files indicating that something is
wrong. I've also looked in the apache error_log but nothing there
either.
The testplan I'm using is as follows:
One thread group with 80 threads that should run forever
An HTTP Request to a very small html page (52-bytes)
Constant timer (300 ms)
And I run this test on two jmeter-servers, and the apache server
manages to serve about 500-550 requests per second. When the server
has been up for 66 s, one or both of the jmeter-servers stop sending
requests.
The same problem occur if I decrease the number of threads, but it
then takes longer time before the jmeter-servers stop sending requests.
The cpu and memory load on each machine are not heavy at all. The
local network is 100MBit/s so I don't think that might be the problem
either.
First I thought the problem was with the jmeter test plan, that it
was too cpu-consuming, but I setup a much more simple test plan and
the same problem still occured. As soon as I used both jmeter-
servers, they stopped sending requests after a while. When I use one
jmeter-server at the time, I have never gotten this problem.
Have anyone any idea of what the problem might be?
I would be very thankful for any help at all!
Just one more thing, when a jmeter test thread sends a http-request,
does it wait for an ACK before sending a new request?
HTTP is a request response protocol.
JMeter sends the request and waits for the response before continuing
to process any further requests in the same thread.
All JMeter samplers are request-response samplers.
//Erik
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