Workgroup Processor Local Launchers for Low-Latency Shader Dispatch
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Solution Overview
Problem
Conventional mechanisms for launching threads in workgroup processors of parallel processors like GPUs introduce performance overhead and inefficiencies due to reliance on a shader program interface (SPI) for thread management, leading to increased latency and resource allocation bottlenecks.
Innovation Solution
Implementing local launchers within workgroup processors that allow for independent thread launching, enabling them to manage their own resource allocation and dispatch queues, reducing the need for direct communication with the SPI and minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional SPI-based thread launching is used in workgroup processors, then centralized resource management is achieved, but thread launch latency increases and performance overhead occurs
Solution Approach 1:
The patent segments the centralized thread launch management function into distributed local launchers at each workgroup processor. Instead of all workgroup processors communicating with a single SPI for thread launches, each WGP has its own local launcher that can independently manage thread dispatch, reducing communication overhead and latency.
Solution Approach 2:
The local launchers enable workgroup processors to self-service their thread launch needs without constant SPI intervention. Each local launcher maintains a local dispatch queue and can autonomously launch threads from its own queue, reducing dependency on centralized management and minimizing launch latency.
2Productivity
If local launchers are implemented for independent thread launching, then thread launch performance improves, but resource allocation complexity increases
Solution Approach 1:
The patent implements local quality by giving each workgroup processor its own local launcher with specialized functionality for managing that specific WGP's thread dispatch. Each local launcher is optimized for its local context, maintaining high performance while distributing the management complexity across multiple independent units rather than one complex centralized system.
Solution Approach 2:
The patent adds a local dimension to resource management by implementing local dispatch queues at each workgroup processor alongside the global SPI queue. This creates a two-level queue hierarchy (local and global) that enables parallel thread management paths, improving performance by allowing simultaneous local and centralized resource allocation operations.
3Ease of operation
If workgroup processors independently manage their own dispatch queues, then finer-grained dispatches are enabled, but communication overhead with SPI increases
Solution Approach 1:
The patent applies preliminary action by having workgroup processors prepare and queue their thread dispatch requests locally before needing to communicate with the SPI. Local dispatch queues accumulate thread launch commands locally, allowing fine-grained dispatch preparation without immediate SPI communication, reducing communication overhead while maintaining operational flexibility.
Data Source
AI summary
Workgroup processors associated with a shader program interface are provided with local launchers capable of launching shader threads partially or completely independently from the shader program interface. The local launchers maintain local queues separately from the shader program interface. The local launchers allocate resources for shader thread execution at an associated workgroup processor either directly or through a request to the shader program interface. In some implementations, the shader program interface leases resources to the local launcher in response to a request for resources and terminates the lease when the local launcher notifies the shader program interface that execution of the shader thread is complete.