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From Carl Shaulis <cshau...@homeaway.com>
Subject Re: Negative Latency
Date Fri, 23 Oct 2009 15:30:25 GMT
Thanks for the reply!  We are updating the JVM on our linux machine, since
it was 1.4.2 and my machine was 1.5.0.

Carl


On 10/23/09 10:05 AM, "sebb" <sebbaz@gmail.com> wrote:

> On 20/10/2009, Carl Shaulis <cshaulis@homeaway.com> wrote:
>> Riddle me this batman!
>> 
>>  If I execute a test of 100 threads using my machine as the master and a
>>  linux machine as the slave with each thread executing a single request I do
>>  NOT get any negative response times.
>> 
>>  If I schedule a test of 100 threads to run 5 minutes looping indefinitely
>>  the single request, I am getting negative response times.
>> 
>>  This does not make sense to me.
>> 
>>  More thoughts?
>> 
> 
> The elapsed times are calculated by the sampler, so clock skew won't
> affect them. The times
> 
> Which version of JMeter are you using?
> JVM?
> 
> The elapsed time calculation depends on both of these.
> 
> Do the timestamps look reasonable?
> 
>>  Carl
>> 
>> 
>> 
>>  On 10/20/09 1:14 PM, "Peter Lin" <woolfel@gmail.com> wrote:
>> 
>>> both systems must be insync.
>>> 
>>> That's fundamental to all distributed applications, including
>>> distributed testing.
>>> 
>>> peter
>>> 
>>> On Tue, Oct 20, 2009 at 2:13 PM, Carl Shaulis <cshaulis@homeaway.com> wrote:
>>>> 
>>>> The difference appears to be about 10 seconds between the clock on my
>>>> machine and the slave server.  I added a constant timer and that made no
>>>> difference.
>>>> 
>>>> Do the two machines really have to be set down to the exact second?
>>>> 
>>>> I would think we are measuring the delta between start and stop on the same
>>>> machine, so the clocks should not matter.
>>>> 
>>>> Thanks,
>>>> 
>>>> Carl
>>>> 
>>>> On 10/20/09 1:06 PM, "Deepak Shetty" <shettyd@gmail.com> wrote:
>>>> 
>>>>> are the time clocks on both machines in sync?
>>>>> 
>>>>> On Tue, Oct 20, 2009 at 11:02 AM, Carl Shaulis
>>>>> <cshaulis@homeaway.com>wrote:
>>>>> 
>>>>>> Hello,
>>>>>> 
>>>>>> We have recently set up a distributed JMeter environment.  I am using
my
>>>>>> MacBook Pro as the Master and a Linux machine as the slave.  I executed
a
>>>>>> very simple test for 5 minutes, where 500 concurrent users access
a
>>>>>> static
>>>>>> html page.  The results showed an average response time of 0 ms.
 Looking
>>>>>> more closely at the data there are numerous transactions that look
like
>>>>>> this.
>>>>>> 
>>>>>> Thread Name: SorryPageTest 1-97
>>>>>> Sample Start: 2009-10-20 12:42:29 CDT
>>>>>> Load time: -897
>>>>>> Latency: -897
>>>>>> Size in bytes: 1723
>>>>>> Sample Count: 1
>>>>>> Error Count: 0
>>>>>> Response code: 200
>>>>>> Response message: OK
>>>>>> 
>>>>>> How can you get a negative load time and negative latency with a
200
>>>>>> response code?
>>>>>> 
>>>>>> Help!
>>>>>> 
>>>>>> Carl
>>>>>> 
>>>> 
>>>> 
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>>>> 
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