Single GPU Graphics Debugging via API Command Interception
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Solution Overview
Problem
Conventional graphics processing units (GPUs) lack the capability to be preemptively halted during execution while continuing to produce image data for display, limiting debugging capabilities to remote systems with multiple GPUs or complex setups, making it difficult for programmers to debug graphics programs on single-GPU systems.
Innovation Solution
A system and method that uses an application shim to intercept API commands, store the initial state of the API context, and implement a replay mechanism to allow debugging techniques like breakpoints and step-through execution on a single GPU, enabling debugging without freezing the display by storing and replaying API commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional GPU execution is used without pre-emption capability, then the GPU can continuously execute graphics programs, but debugging operations cannot halt execution to inspect state
Solution Approach 1:
The patent introduces a debug layer as an intermediary between the application and GPU execution. This debug layer intercepts API commands, manages breakpoints, and controls execution flow without requiring modifications to the GPU hardware itself. The intermediary layer enables debugging functionality on conventional GPUs by software-based command interception and replay mechanisms.
Solution Approach 2:
The patent creates a copy of the API command stream and replays it under controlled conditions. By capturing the original command stream and replaying it through the debug layer, the system can pause execution at breakpoints, inspect GPU state, and continue execution without affecting the original application flow. This copying mechanism enables single-GPU debugging by separating the debugging control plane from the execution data plane.
2Device complexity
If a single GPU is used for both display and debugging, then hardware requirements are simplified, but the ability to halt execution without freezing display is lost
Solution Approach 1:
The patent segments the GPU execution flow into interceptable API command units. By dividing the continuous execution stream into discrete commands that can be individually intercepted, paused, and inspected, the system enables debugging on a single GPU without freezing the display. The segmentation allows the debug layer to control specific portions of execution while leaving other operations unaffected.
Solution Approach 2:
The patent performs preliminary actions by pre-capturing the API command stream and preparing debug information before actual debugging occurs. The system pre-processes commands, identifies breakpoint locations, and prepares state capture mechanisms in advance, enabling rapid pause-and-inspect operations without disrupting display rendering during the actual debugging session.
3Ease of operation
If the GPU context is stored and replayed for debugging, then execution can be inspected step-by-step, but the display output may be affected
Solution Approach 1:
The patent applies local quality by selectively replaying only the portions of the API command stream that are relevant to the current debugging context. Instead of replaying entire frames or sequences, the system identifies and replays specific command ranges between breakpoints, minimizing the impact on display rendering while providing sufficient information for debugging analysis.
Data Source
AI summary
A system, method, and computer program product are provided for debugging graphics programs via a system with a single graphics processing unit. The method includes the steps of storing an initial state of an application programming interface context in a memory, intercepting a stream of API commands associated with the frame, transmitting the stream of API commands to a software layer that implements the API to render the frame, and in response to a breakpoint, storing a graphics processing unit context in the memory. The initial state of the API context corresponds to the start of a frame, and the stream of API commands are generated by a graphics application.