Direct GPU-FPGA Communication via PCIe Bypassing CPU Memory
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Solution Overview
Problem
Current technologies face challenges in enabling efficient direct communication between Graphics Processing Units (GPUs) and Field Programmable Gate Arrays (FPGAs), leading to high latency and resource-intensive data transfers, which hinder their synergistic use in computational tasks.
Innovation Solution
Implementing a direct communication pathway using the Peripheral Component Interconnect Express (PCIe) bus, allowing GPUs and FPGAs to transfer data directly without intermediaries, utilizing PCIe switches and virtual pointers to access memory locations, and leveraging DMA transfers for efficient data movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If data is transferred between GPU and FPGA through CPU memory as an intermediary, then compatibility and ease of implementation are improved, but latency increases and bandwidth is reduced
Solution Approach 1:
The patent removes the CPU memory intermediary and establishes a direct PCIe communication pathway between GPU and FPGA. This eliminates the indirect routing through CPU system memory, reducing latency while maintaining implementation feasibility through standardized PCIe interfaces and buffer management mechanisms.
Solution Approach 2:
The patent extracts the CPU memory intermediary from the data transfer pathway. By removing this intermediate component, the system achieves direct GPU-FPGA communication, eliminating the latency and bandwidth overhead associated with CPU memory access while preserving ease of implementation through direct PCIe connectivity.
2Adaptability or versatility
If data is transferred between GPU and FPGA through CPU memory as an intermediary, then system compatibility is improved, but bandwidth is reduced
Solution Approach 1:
The patent replaces CPU memory as the intermediary with a direct PCIe communication channel. This maintains system compatibility through standardized PCIe protocols while dramatically increasing bandwidth by eliminating the bottleneck of CPU system memory access and enabling full-utilization PCIe transfer rates.
Solution Approach 2:
The patent extracts CPU memory from the data transfer pathway, eliminating the bandwidth limitation imposed by CPU memory access speeds. The direct PCIe connection enables maximum bandwidth utilization between GPU and FPGA while preserving compatibility through standardized interfaces and buffer management.
3Loss of time
If direct communication pathway is implemented between GPU and FPGA, then latency is reduced and bandwidth is increased, but resource overhead increases
Solution Approach 1:
The patent implements preliminary buffer allocation and PCIe resource setup before data transfer begins. By pre-configuring transfer buffers and establishing PCIe communication parameters in advance, the system reduces runtime resource overhead while achieving low-latency direct communication between GPU and FPGA.
4Productivity
If direct communication pathway is implemented between GPU and FPGA, then communication efficiency is improved, but resource overhead increases
Solution Approach 1:
The patent performs preliminary configuration of PCIe resources, buffer allocation, and transfer parameter setup before initiating data transfer. This preliminary action simplifies the actual transfer process, improving communication efficiency while managing resource overhead through pre-established communication channels and standardized protocols.
Data Source
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AI summary
A system may include a Graphics Processing Unit (GPU) and a Field Programmable Gate Array (FPGA). The system may further include a bus interface that is external to the FPGA, and that is configured to transfer data directly between the GPU and the FPGA without storing the data in a memory of a central processing unit (CPU) as an intermediary operation.