Performance & Load Testing Flashcards
7 cards from real Software Testing practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Performance & Load Testing flashcards as text
Which open-source tool is most widely used for load testing and measuring web application performance?
Answer: Apache JMeter
Apache JMeter is the most widely adopted open-source performance testing tool, capable of simulating heavy loads on servers and networks.
What does the 95th percentile response time tell you during performance test analysis?
Answer: The response time below which 95% of all requests were completed
The 95th percentile means 95% of requests completed in that time or less, providing a better picture of user experience than averages, which can be skewed by outliers.
What is 'think time' in the context of load test scripting?
Answer: The simulated pause a virtual user waits between actions to mimic real behavior
Think time simulates the natural pause real users take between actions (such as reading a page before clicking), making load scenarios more realistic.
Which performance metric represents the percentage of requests that did not complete successfully during a test run?
Answer: Error rate
Error rate is the proportion of failed transactions relative to total transactions, and a rising error rate under load signals system instability.
What is the Apdex (Application Performance Index) score designed to measure?
Answer: User satisfaction with application response times on a 0-to-1 scale
Apdex converts response time data into a satisfaction index from 0 (no users satisfied) to 1 (all users satisfied), simplifying communication of performance results.
In a performance test configuration, what does 'ramp-up time' refer to?
Answer: The period during which virtual users are gradually added to reach the target concurrency
Ramp-up time is the duration over which virtual users are incrementally added, preventing an artificial sudden spike and more closely mimicking organic traffic growth.
Which performance testing concept describes the number of users simultaneously active in the system at a given moment?
Answer: Concurrency
Concurrency is the count of users or processes simultaneously interacting with the system, directly influencing resource contention and response time.