Hardware Asynchronous Events for Coprocessor Coordination
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Solution Overview
Problem
Traditional methods for coordinating coprocessors, such as interrupts and polling, lead to suboptimal system throughput, idling of CPU or coprocessors, and prevent flexible interaction among coprocessors, resulting in underutilization and increased costs due to 'dark silicon' and latency issues.
Innovation Solution
The implementation of hardware-supported asynchronous events, where coprocessors receive event descriptors to configure and detect events, enabling decentralized flow control and coordination through event bitmaps and global event distributors, allowing peer-to-peer coordination and efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If centralized control by CPU is used to orchestrate coprocessors, then coordination is simplified, but system throughput decreases due to CPU or coprocessor idling
Solution Approach 1:
The patent segments the centralized control function into distributed event management across multiple coprocessors. Each coprocessor maintains its own event queue and can independently process events, eliminating the bottleneck of centralized CPU control while maintaining coordination through shared event queues and synchronization mechanisms.
Solution Approach 2:
The patent introduces event queues and event descriptors as intermediary structures between coprocessors. These intermediaries enable asynchronous communication and coordination without requiring direct CPU intervention, allowing coprocessors to exchange information and synchronize operations independently.
2Speed
If interrupts are used for coprocessor coordination, then real-time notification is achieved, but critical section enforcement is complicated and atomicity is compromised
Solution Approach 1:
The patent replaces the traditional interrupt mechanism with an event-driven approach using event descriptors and event queues. This substitution eliminates the need for interrupt handlers that compromise atomicity, while maintaining real-time notification capabilities through hardware-supported event detection and asynchronous processing.
3Device complexity
If polling is used for coprocessor coordination, then simple implementation is achieved, but system efficiency decreases significantly
Solution Approach 1:
The patent replaces continuous polling with periodic event-driven actions. Coprocessors are notified of events asynchronously, and processing occurs only when events are detected, eliminating the wasteful continuous polling cycles while maintaining simple event checking mechanisms through event bitmaps and status flags.
4Ease of manufacture
If traditional coprocessor coordination models are used, then implementation is straightforward, but flexibility for general purpose software interactions is limited
Solution Approach 1:
The patent implements a universal event descriptor structure that can represent various types of events and coordination patterns. The event queue mechanism serves multiple functions including notification, synchronization, and data exchange, providing flexible interaction patterns that accommodate general purpose software requirements while maintaining straightforward hardware implementation.
Data Source
AI summary
Techniques are provided for improving the performance of a constellation of coprocessors by hardware support for asynchronous events. In an embodiment, a coprocessor receives an event descriptor that identifies an event and a logic. The coprocessor processes the event descriptor to configure the coprocessor to detect whether the event has been received. Eventually a device, such as a CPU or another coprocessor, sends the event. The coprocessor detects that it has received the event. In response to detecting the event, the coprocessor performs the logic.