Flexible Performance Counter and Debug Module for GPU Event Capture
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Solution Overview
Problem
Modern GPUs face challenges in optimizing design trade-offs for performance and debugging due to their intensely parallel nature, making it difficult for designers to capture event data efficiently and debug complex issues within the processor or system.
Innovation Solution
A highly flexible performance counter and system debug module, comprising performance and debug monitoring circuits (PDMCs) with input stages, combinatorial stages, and counters, which receive input signals from other PDMCs, combinatorial logic circuits, and configuration values, perform logical operations, and increment counters based on results, enabling efficient event data capture and debugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional hardware performance counters are used in GPUs, then performance monitoring capability is provided, but the device complexity and difficulty of capturing event data increase due to the intensely parallel nature of GPUs
Solution Approach 1:
The performance monitoring system is segmented into multiple Performance and Debug Monitoring Circuits (PDMCs), where each PDMC independently monitors specific events in parallel. This segmentation allows the system to handle GPU's parallel nature by distributing monitoring tasks across multiple independent units, reducing the complexity of a monolithic monitoring system while maintaining comprehensive event capture capability.
Solution Approach 2:
Each PDMC is designed as a universal monitoring unit that can be configured to monitor different types of events through programmable input stages and combinatorial logic. The same hardware structure serves multiple monitoring purposes by accepting various input signals and configuration parameters, reducing overall device complexity through reuse of identical functional blocks rather than requiring specialized circuits for each event type.
2Measurement precision
If multiple performance monitoring circuits are added to capture complex GPU events, then measurement precision improves, but the device complexity and number of components increase
Solution Approach 1:
The patent employs identical PDMC blocks that can be replicated and configured for different monitoring needs. Each PDMC is a universal unit capable of monitoring various events through programmable inputs and logic, allowing the system to achieve high measurement precision through multiple circuits without proportionally increasing complexity, as the same design pattern is reused.
Solution Approach 2:
The PDMCs incorporate programmable and configurable elements that allow dynamic adaptation to different monitoring requirements. The input stages, combinatorial logic, and counter configurations can be dynamically programmed to match the specific events being monitored, enabling precise event capture without requiring hardwired specialized circuits for each event type.
3Ease of operation
If traditional debug features are used, then basic debugging functionality is provided, but the ease of operation and flexibility for capturing event data in complex GPU scenarios deteriorates
Solution Approach 1:
The PDMCs feature programmable input stages and combinatorial logic that can be dynamically configured to monitor different events and conditions. This dynamic configurability provides both ease of operation through software-controlled setup and high adaptability to various debugging scenarios, allowing the same hardware to be flexibly reconfigured for different debugging needs without manual rewiring or complex setup procedures.
Solution Approach 2:
The system incorporates feedback mechanisms where counter outputs and monitoring results can be fed back into the system for further analysis and configuration adjustments. This feedback capability enhances ease of operation by allowing iterative debugging and provides versatility by enabling complex conditional monitoring where previous event results influence future monitoring behavior.
Data Source
AI summary
According to one general aspect, an apparatus may include a plurality of performance and debug monitoring circuits (PDMCs). Each performance and debug monitoring circuit (PDMC) may include an input stage, a combinatorial stage, and a counter. The input stage may be configured to receive a plurality of input signals, wherein the input signals include: signals from other performance and debug monitoring circuits, signals from combinatorial logic circuits, and configuration values. The combinatorial stage may be configured to perform one or more logical operations on a selected sub-set of the input signals. The counter may be configured to increment based, at least in part, upon a result of the combinatorial stage.