Timers in Apache JMeter
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The document explains the function of timers in Apache JMeter, highlighting the importance of introducing delays between requests to mimic real user behavior. It details various types of timers available, including constant timer, Gaussian random timer, and synchronizing timer, outlining their specific functions and use cases. The goal of these timers is to improve the simulation of realistic user interactions during performance testing.
Timers in Apache JMeter
- 1. Timers in Apache JMeter NAVEENKUMAR NAMACHIVAYAM Founder – QAInsights.com http://QAInsights.com
- 2. What is Timers? • By default, Jmeter doesn’t pause the requests while sending. • In real time, users spend time while browsing i.e. during check out, before clicking on Submit etc. • It is best practice to include some delay between requests. • Timers in Jmeter induces delay in sending samplers. • There are different types of Timers in Jmeter: • Constant Timer • Gaussian Random Timer • Uniform Random Timer • Constant Throughput Timer • Synchronizing Timer • BeanShell Timer • BSF Timer • JSR223 Timer • Poisson Random Timer
- 3. Constant Timer • To induce each thread pause for the same amount of time between requests, use Constant timer. • Below Constant Timer induces 3 seconds delay between
- 4. Gaussian Random Timer • This timer pauses each thread request for a random amount of time, with most of the time intervals occurring near a particular value. • Gaussian means with most of the time intervals ocurring near a particular value i.e. constant interval & varying between constant interval + deviation.
- 5. Uniform Random Timer • This timer pauses each thread request for a random amount of time, with each time interval having the same probability of occurring. • The total delay is the sum of the random value and the offset value (Number of milliseconds to pause in addition to the random delay.)
- 6. Constant Throughput Timer • This timer introduces variable pauses, calculated to keep the total throughput (in terms of samples per minute) as close as possible to a give figure.
- 7. Synchronizing Timer • The purpose of the SyncTimer is to block threads until X number of threads have been blocked, and then they are all released at once. • It is similar to Rendezvous Point in LoadRunner. • It will create large load at various points in Jmeter plan.
- 8. Poisson Random Timer • This timer pauses each thread request for a random amount of time, with most of the time intervals occurring near a particular value. • The total delay is the sum of the Poisson distributed value, and the offset value.
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