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From sebb <>
Subject Re: negative response times again
Date Thu, 08 Jul 2010 11:54:40 GMT
On 8 July 2010 12:43, 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?

Latency of 0 is to be expected sometimes, due to timer resolution.

Also not all samplers support latency, in which case the value will
always be zero.

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