https://issues.apache.org/bugzilla/show_bug.cgi?id=56206
Bug ID: 56206
Summary: Response times reported by TCP sampler in a thread
group scale with the number of threads
Product: JMeter
Version: 2.11
Hardware: PC
Status: NEW
Severity: major
Priority: P2
Component: Main
Assignee: [email protected]
Reporter: [email protected]
Created attachment 31359
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31359&action=edit
Python echo server and Jmeter config
A single tcp sampler within a thread group is run a few times in a row (re-use
connection option is off).
It sends request to an echo service which has a more or less fixed response
delay
With just 1 thread, response times reported by jmeter match up with the echo
server.
If you increase the number of threads, response times reported by Jmeter scale
in direct proportion with that number.
Test scenario also includes a timer alongside the sampler which one can play
with (as well as with the thread group's ramp up time) to observe various
effects (2 threads, 1sec ramp up time, 200ms timer = 800ms sample times instead
of 1000 without the timer)
Steps to reproduce:
just run the attached echo server (Python) and the Jmeter test plan with
various thread group settings
Expected results:
Sample times around 500ms regardless of the number of threads (at least until
the echo server gets overwhelmed)
Observed on both Windows 7 x64 and Ubuntu 13.10
java version "1.7.0_10"
Java(TM) SE Runtime Environment (build 1.7.0_10-b18)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)
Jmeter 2.11.r1554548
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