Stream Client Emulator for Load Testing
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Solution Overview
Problem
Load testing of streaming services is complicated and resource-intensive due to the need for multiple streaming clients, which requires significant computing resources and can be costly, and existing methods struggle to accurately simulate the impact of multiple clients without replicating all functionalities of actual clients.
Innovation Solution
The use of stream client emulators that mimic conventional streaming clients by communicating with streaming services using the same protocols and maintaining a pseudobuffer to simulate buffer characteristics, allowing for efficient load testing without processing or outputting stream data, thereby reducing the computational resources needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple streaming clients are used for load testing, then the accuracy of performance measurement is improved, but the computing resources and cost increase significantly
Solution Approach 1:
The patent creates a pseudobuffer that copies the essential buffering behavior of real streaming clients without requiring actual client software. The pseudobuffer simulates buffer fill/empty events, buffering delays, and jitter by receiving stream data from the streaming service and generating synthetic performance metrics based on delivery rate versus output rate calculations, thereby achieving accurate performance measurement with minimal computing resources
Solution Approach 2:
The patent extracts only the critical buffering functionality from full streaming clients to create a simplified emulator. By isolating the buffer management logic and performance measurement capabilities while removing unnecessary client functions (video decoding, audio processing, UI rendering), the system achieves accurate load testing with significantly reduced resource consumption
2Reliability
If full streaming clients are replicated, then the realism of load testing is improved, but the complexity and resource consumption increase
Solution Approach 1:
The pseudobuffer copies only the essential buffering characteristics and performance metrics of real clients, generating synthetic buffer fill/empty events and timing data that realistically simulate client behavior without requiring actual client software, thereby maintaining testing realism while reducing complexity
Solution Approach 2:
The system segments the streaming client functionality into essential buffering behavior (retained in pseudobuffer) and non-essential functions (removed). This segmentation allows the emulator to focus solely on buffer management and performance measurement, reducing system complexity while preserving the critical aspects needed for reliable load testing
3Measurement precision
If stream data is processed and output by testing clients, then the accuracy of buffer behavior simulation is improved, but the computational resources required increase
Solution Approach 1:
The patent extracts only the buffer management logic from full streaming clients, eliminating resource-intensive operations such as video decoding, audio processing, and rendering. The pseudobuffer receives stream data and generates synthetic buffer events based on delivery rate versus output rate calculations without actual data processing, achieving accurate buffer simulation with minimal computational resources
Solution Approach 2:
The system creates a synthetic copy of buffer behavior through the pseudobuffer, which simulates buffer fill/empty events, buffering delays, and jitter by calculating the difference between stream delivery rate and output rate. This copied buffer behavior provides accurate simulation without the computational overhead of processing and outputting actual stream data
Data Source
AI summary
In one implementation, a stream client emulator includes a stream access module and a monitor module. The stream access module receives stream data from a streaming service and consumes the stream data according to an output rate of a stream without outputting the stream data. The monitor module determines that buffer events have occurred relative to the stream data and a buffer characteristic.