> 
> How much longer? A few percent or much more?
> 

significantly.  an average of 89ms at the apache logs, and yet 140 at
jmeter.  The key point is though that this latency is pratically zero at
lower loads.  The reason it causes us a problem is we define failure by
saying 95% of responses must be less than a given response time - so this
extra gap is seemingly causing us to fail the tests, but unnecessarily.

> Are all samples affected?

Err, good question, i've been looking at averages, so i dont know at this
point.  I guess i should look at standard deviation perhaps..?

> Does the additional time depend on the sample size?

Err, sample size?  or throughput?  yes it increases with throughput.

> Note that the elapsed time will necessarily be longer than the apache
> log time; the JMeter latency should be closer to the apache log
> timings.
> 
> Are you using any functions in the samplers? Function execution is
> single-threaded.

I'm not sure, i'll double check.  However i have profiled jmeter recently
and it didnt seem to be blocking - i do need to double check this, hopefully
i'll do that tomorrow.


> > Thanks,
> > Dan
> >
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