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From Deepak Goel <>
Subject Re: negative response times again
Date Thu, 08 Jul 2010 13:07:14 GMT
Some thoughts:

1. Can you please post the whole network and server diagram?
2. What is your precision level for measuring latency?
3. It could be possible you might be getting all errors. It would help
if you could post the results also.


On 7/8/10, monpru <> wrote:
> Hi,
> 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
> R26.4.0-63_CR302700-72606-1.5.0_06-20061127-1104-linux-ia32
> -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
> time?
> I might be overlooking something obvious here, so I would be thankful for
> hints regarding this problem.
> Regards,
> Monique
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