JMeter#

#What is Apache JMeter?

Apache JMeter is an open-source tool designed to generate automated requests and simulate concurrent users to measure system performance. It generates load and captures HTTP-level metrics such as response time, throughput, and error rate. While originally built for HTTP testing, JMeter supports a wide range of protocols:

• HTTP / HTTPS
• REST API
• SOAP
• JDBC
• FTP
• JMS
• TCP
• LDAP

#Use Cases

#UC-1: Reproducing Concurrency Bugs

Example Scenario: "The homepage slows down significantly around 9:00 AM." Opening a browser returns a 200ms response time and hides the issue. Running JMeter with 500 simulated concurrent users reveals response times, CPU/Memory spikes, and error rates.

#UC-2: Component Performance Impact Verification

Example Scenario: Page structure:

Home -> Banner -> Hero -> Search Component -> Recommendation Component -> Footer

After modifying the Search Component, verify its performance impact: Baseline average: 200ms. Post-change average: 400ms? Executing JMeter with 100 requests reports Min, Max, Average, and 95th Percentile response times to determine if the component degrades page performance.

#Core Features & Usage Frequency

#Basic Execution Setup

Publish Page Load Test Plan (Publisher):

Test Plan
|___Thread Group
	|___HTTP Cookie Manager
	|___HTTP Request (Login)
	|___HTTP Request (Get Page)
	    |___Aggregate Report
	    |___Summary Report
	    |___View Results Tree

#Configuration

#HTTP Cookie Manager Configuration

Add element: Test Plan → Thread Group → Add → Config Element → HTTP Cookie Manager

#Login HTTP Request Configuration

#Page HTTP Request Configuration