GPU Command Processor Direct Network Message Handling
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Solution Overview
Problem
Current GPU networking applications incur performance reduction due to the need for a host CPU to pre-register or initiate network messages on behalf of the GPU, resulting in back-to-back round trips and delays in computations.
Innovation Solution
A system where a parallel processor, such as a GPU, generates and processes network messages independently using a command processor that communicates directly with a network interface unit, eliminating the need for host involvement by storing messages in a cache and using RDMA for direct networking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the host CPU generates network messages on behalf of the GPU, then network communication can be initiated, but performance is reduced due to back-to-back round trips and computation delays
Solution Approach 1:
The GPU is empowered to generate and send network messages independently through its integrated command processor, eliminating the need for host CPU intervention. The command processor detects network message indications in cache, retrieves messages, and transmits them directly to the network interface, allowing the GPU to serve its own networking needs without external assistance.
Solution Approach 2:
The network message generation and transmission functions are extracted from the host CPU and transferred to the GPU's command processor. This separation allows the CPU to focus on computation while the GPU handles its own networking, removing the CPU as a bottleneck in the communication path.
2Reliability
If the host CPU pre-registers network messages for the GPU, then network communication is enabled, but multiple round trips between GPU and host increase latency
Solution Approach 1:
The GPU independently manages network message registration and transmission through its command processor, eliminating the need for host CPU pre-registration. The command processor monitors cache for network message indications and handles transmission autonomously, reducing communication overhead and latency.
Solution Approach 2:
The command processor acts as an intermediary between the GPU compute units and the network interface. It receives network message indications from compute units, retrieves messages from cache, and transmits them to the network interface, serving as a local mediator that eliminates the need for distant host CPU intervention.
3Productivity
If the GPU uses an integrated command processor to generate network messages independently, then performance is improved by eliminating round trips, but device complexity increases
Solution Approach 1:
The command processor is designed to handle multiple functions including kernel execution management, memory operations, and network message generation. By making the command processor multi-functional, the GPU achieves independent networking capability without adding separate dedicated hardware for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The network message generation and transmission functions are merged into the existing command processor architecture. Rather than adding separate networking hardware, the patent integrates networking capabilities into the command processor that already exists for GPU operation, combining multiple functions into a single processing unit.
Data Source
AI summary
Systems, apparatuses, and methods for generating network messages on a parallel processor are disclosed. A system includes at least a parallel processor, a general purpose processor, and a network interface unit. The parallel processor includes at least a plurality of compute units, a command processor, and a cache. A thread within a kernel executing on a compute unit of the parallel processor generates a network message and stores the network message and a corresponding indication in the cache. In response to detecting the indication of the network message in the cache, the command processor processes and conveys the network message to the network interface unit without involving the general purpose processor.