Hey all,
I'm trying to find out exactly what Elapsed Time includes, it seems to
have a big impact on my experiments as I'm getting some funny results
and one of the machines keep on crashing. Latency results on the other
hand seems fine. Any help would be very much appreciated.
Experiment:
Test Plan
Thread Group (users 5, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 10, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 15, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 20, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 25, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 30, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 35, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Thread Group (users 40, ramp 0, count 250)
HTTP Request HTTPClient (SSL request)
Simple Data Writer
Gaussian Random Timer (Delay offset 100, deviation 20)
6 identical machines; 1 server, 4 clients and 1 collecting the
results. All on the same local network making secure requests for a
single 131K pdf file.
Issue 1:
Upon inspecting the results files (the request timestamps) it seems
that my request rate is actually decreasing over time from about 55
req/s to 12 req/s! and then the machine collecting the results crashes
but the others, including the server seems fine.
Issue 2:
The Elapsed time INcreases as follows:
----------- Elapsed time -----------------
Mean: 145.9614
Confidence interval: 4.4535686733307775
----------- Elapsed time -----------------
Mean: 271.8111
Confidence interval: 10.990474145938794
----------- Elapsed time -----------------
Mean: 441.96093333333334
Confidence interval: 15.121548663364933
----------- Elapsed time -----------------
Mean: 577.16795
Confidence interval: 17.569224709437265
----------- Elapsed time -----------------
Mean: 784.111
Confidence interval: 23.90328057326669
----------- Elapsed time -----------------
Mean: 738.2100486223663
Confidence interval: 30.158344351290822
----------- Elapsed time -----------------
Mean: 1723.2670157068062
Confidence interval: 348.28728611889505
But the latency DEcreases towards the end:
----------- Latency -----------------
Mean: 57.7488
Confidence interval: 3.7233761673353256
----------- Latency -----------------
Mean: 117.8008
Confidence interval: 7.795127906431532
----------- Latency -----------------
Mean: 187.74713333333332
Confidence interval: 7.9288495213299
----------- Latency -----------------
Mean: 228.9634
Confidence interval: 7.752167562857181
----------- Latency -----------------
Mean: 309.96296
Confidence interval: 9.900207087746896
----------- Latency -----------------
Mean: 285.04105888708807
Confidence interval: 14.377120160947742
----------- Latency -----------------
Mean: 101.07329842931937
Confidence interval: 37.688563788937685
What usually happens is that over time the server response time
increases steadily and then caps off (i.e. does not increase further)
at a certain client load regardless of further request increases. The
latency numbers might be showing this if it was allowed to run for a
bit longer, if only the Elapsed Time didn't peak.
Any help would be very much appreciated!
Thanks again
Christiaan
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