One benefit of using Mock Services when testing is to introduce irregular behavior that's difficult to get a real web service to produce on demand. A test script rushes through the test steps at the same speed every time, but in BlazeMeter, a transaction can also have a fixed or random-length delay before the response is returned.
BlazeMeter's Think Time option introduces a delay that can be used as a factor to simulate slow human responses or network latency. The delay can be a fixed value or can be sampled from a random distribution which makes it easy for you to simulate different types of downstream latencies.
There are several ways how to access the Think Time tab to add a delay to a transaction:
- Go to the Asset Catalog tab, open the transaction, and edit the Response Parameters.
- Go to the Mock Services tab, open a Mock Service, and go to the Parameters tab.
For each transaction response, you have the following options:
Think Time
- No Delay / Don't use transaction delay
Sets the Think Time to 0 milliseconds. This is the default. - Fixed Delay
Lets you define a fixed response delay in milliseconds. - Random Uniform Delay
A uniform distribution simulates a stable latency with a fixed amount of jitter.
Example: To simulate a stable latency of 20ms +/- 5ms, use lower = 15 and upper = 25.
This option takes two parameters:- lower - The lower bound of the range, inclusive.
- upper - The upper bound of the range, inclusive.
- Random Lognormal Delay
A lognormal distribution is a pretty good approximation of long-tailed latencies centered on the 50th percentile.
This option takes two parameters:- median - The 50th percentile of latencies.
- sigma - Standard deviation. The larger the value, the longer the tail.
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