Bitonic Sorting Accelerator Using R2SDF Architecture
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Solution Overview
Problem
Current software-based sorting operations, such as those performed by CPUs or GPUs, are computationally intensive and inefficient, limiting their ability to perform other tasks, and existing hardware accelerators for bitonic sorting do not adequately improve sorting speed and reduce circuit area.
Innovation Solution
A hardware accelerator for bitonic sorting using a modified Radix-2 single delay feedback (R2SDF) architecture with compare-exchange circuits and FIFO buffers, which sorts N binary numbers in (N*log2N) clock cycles, achieving the theoretical upper bound for sorting speed, and enhances throughput by increasing parallelism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If software-based sorting operations are used on CPUs or GPUs, then sorting functionality is available, but computational efficiency is poor and other tasks are limited
Solution Approach 1:
The patent replaces software-based sorting algorithms executed on general-purpose processors with a dedicated hardware sorting accelerator that implements bitonic sorting logic in circuitry. This substitution of mechanical/computational system with a specialized hardware system achieves faster sorting operations while freeing up CPU/GPU resources for other tasks.
2Speed
If existing hardware accelerators for bitonic sorting are used, then sorting speed is improved, but circuit area is not adequately reduced
Solution Approach 1:
The patent segments the bitonic sorting process into multiple stages with shared compare-exchange units. Instead of dedicating separate hardware for each comparison operation, the same hardware resources are reused across different stages of the sorting process, significantly reducing the total circuit area while maintaining sorting speed.
Solution Approach 2:
The patent implements dynamic reconfiguration of compare-exchange units that can adapt their operation based on the current sorting stage. The hardware accelerator dynamically adjusts its behavior to perform different comparison patterns required at different stages of bitonic sorting, optimizing both speed and resource utilization.
3Productivity
If traditional sorting architectures are used, then implementation is simple, but throughput is limited
Solution Approach 1:
The patent extends the traditional bitonic sorting architecture by adding parallel processing dimensions. Multiple compare-exchange units operate simultaneously on different data elements, and the architecture supports parallel input/output operations, effectively increasing throughput by utilizing additional processing dimensions rather than simply increasing the speed of single operations.
Data Source
AI summary
An accelerator for bitonic sorting includes a plurality of compare-exchange circuits and a first-in, first-out (FIFO) buffer associated with each of the compare-exchange circuits. An output of each FIFO buffer is a FIFO value. The compare-exchange circuits are configured to, in a first mode, store a previous value from a previous compare-exchange circuit or a memory to its associated FIFO buffer and pass a FIFO value from its associated FIFO buffer to a subsequent compare-exchange circuit or the memory; in a second mode, compare the previous value to the FIFO value, store the greater value to its associated FIFO buffer, and pass the lesser value to the subsequent compare-exchange circuit or the memory; and in a third mode, compare the previous value to the FIFO value, store the lesser value to its associated FIFO buffer, and pass the greater value to the subsequent compare-exchange circuit or the memory.