Performance Testing: What does fluctuating Response time indicates?
Below is the graph which I received after the performance test execution. I am confused about the fluctuated response time graph. NOTE: 1) Throughput graph is also fluctuating. 2) I did not receive any error during test.
Solution
It normally indicates that either application under test or JMeter engine is overloaded hence it cannot handle/produce stable load pattern.
Your response time is around 1.5 minutes which seems little bit high to me so I would suggest that you need to monitor the application under test and check:
- whether it has enough headroom to operate in terms of CPU, RAM, Network IO, etc. as it might be the case the application is short on RAM and goes swapping and disk IO is much slower than RAM, it can be checked using i.e. JMeter PerfMon Plugin
- whether it is properly configured for high loads as its middleware (database, application server, load balancer, etc. need to be tuned, spike-like response time pattern may stand for intensive GC activity
- in any case ensure that JMeter is also properly configured for high load and isn't short on resources as if JMeter isn't able to send/receive requests fast enough you will get false-negative results
Single chart never tells the full story, you need to correlate information from all the possible sources, collect log files, etc.
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