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From monpru <>
Subject negative response times again
Date Thu, 08 Jul 2010 11:43:29 GMT

I got negative latency values in my last load test of a web service. I
searched the web and found that this might have something to do with the jdk
I use? I wonder what the problem is or how to ensure that I get correct
latency in future tests? I am not allowed to use Wireshark or similar to
check transmission times. The load during the tests was quite low (350
requests/minute) and none of the machines involved in the test struggled. I
used 2 thread groups with one Constant Throughput Timer each, all samplers
are SOAP/XML-RPC Requests. I use csv format for logging.
I tried to re-run the test using different jdks and got results that
differed, but had negative and 0 latency in each of the tests.
I used JMeter 2.3.4 r785646
and tried with the following
-Java HotSpot(TM) Server VM (build 1.5.0_16-b02, mixed mode)
-BEA JRockit(R) (build
-Java HotSpot(TM) Server VM (build 1.5.0_06-b05, mixed mode)
on a machine with CentOS release 4.7 and got negative and 0 latency for all.

I tried on a different machine using BEA WebLogic JRockit(TM) 1.4.2_08 JVM
R24.5.0-61 on Red Hat Enterprise Linux ES release 4 (Nahant Update 2): here
I only had 0 load time (the last value) for some requests, but no negative
or 0 latency. But I am unsure if this means the latency is correct this

I might be overlooking something obvious here, so I would be thankful for
hints regarding this problem.

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