Stress Testing

What it does

This skill simulates extreme user loads and data conditions to identify system vulnerabilities and performance bottlenecks. It uses k6, a load testing tool, to push systems beyond normal operating capacity, revealing breaking points, failure modes, and recovery behavior. The goal is to validate stability under stress and determine maximum capacity before degradation or failure occurs.

When to use it

• Finding system capacity limits
• Identifying breaking points in a system
• Testing auto-scaling behavior under load
• Validating error handling when the system experiences high traffic
• Planning future capacity requirements based on stress test results
• Verifying graceful degradation of service under extreme conditions
• Testing how the system handles sudden spikes in user activity

Key capabilities

• Simulates progressive load increases using k6.
• Defines stages for normal, above-normal, and breaking point loads.
• Monitors HTTP request duration and failure rates during testing.
• Allows setting thresholds for acceptable performance (e.g., 99% of requests under 1 second).

Example prompts

While this skill is code-based and doesn't directly respond to natural language, a user would configure the stress-test.js file with parameters relevant to their system. For example:

• "Configure the stress test to simulate 200 concurrent users for 5 minutes."
• "Adjust the HTTP request duration threshold to allow for slower response times during peak load."
• "Modify the script to target a specific API endpoint for stress testing."

Tips & gotchas

• This skill requires familiarity with k6 and JavaScript.
• The provided example uses k6/http, so ensure this is compatible with your environment.
• Carefully define load stages and thresholds based on the expected system behavior to avoid unintended consequences or inaccurate results.