Testing / Apache JMeter Interview questions
How does the ramp-up period affect a JMeter test?
The ramp-up period is the amount of time JMeter takes to start all the threads configured in a Thread Group - for example, 100 threads with a 50-second ramp-up means a new thread starts roughly every half-second until all 100 are running.
A short or zero ramp-up starts every thread almost simultaneously, producing a sudden burst of concurrent load right at the start of the test, which is realistic for simulating a spike but can also produce misleadingly extreme initial response times that aren't representative of steady-state behavior.
A longer, gradual ramp-up more realistically simulates traffic building up over time, and is generally preferred when the goal is to observe how the system behaves as load steadily increases, rather than testing its reaction to an instantaneous surge.
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