A Double Precision Floating Streaming Accumulator Architecture


Reference #: 00890

The University of South Carolina is offering licensing opportunities for a double precision floating point stream accumulator.

Invention Description:

This invention is a SpMV architecture based on a novel streaming reduction circuit and a specialized cache optimized for CSR data. This architecture is implemented on the Convey HC-1, a self-contained heterogeneous system containing a Xeon-based host and an FPGA-based co-processor board with four user programmable Virtex5-LX330 FPGAs. A CSR sparse matrix-vector multiplier was configured and its implementation was analyzed on the Convey HC-1 reconfigurable computer. This invention represents a new streaming reduction circuit design and an on-chip memory architecture optimized for CSR-formatted sparse matrix data. Test results show performance that exceeds that of the Tesla GPU.


Sparse Matrix Vector Multiplication (SpMV) describes solving y = Ax where y and x are vectors and A is a large matrix populated mostly with zero entries. Due to the sparseness of the matrix, it is often neither practical nor feasible to store every entry of the matrix in a traditional dense representation, so compressed sparse representations, such as compressed sparse row (CSR) format, are often used to represent the matrices in memory.

Potential Applications:

SpMV is frequently employed in scientific and engineering applications and is the kernel for iterative linear system solvers, such as the conjugant gradient method.

Advantages and Benefits:

  1. A novel streaming reduction architecture for floating point accumulation.
  2. A novel on-chip cache design optimized for streaming compressed sparse row (CSR) matrices.
  3. End-to-end integration with the HC-1 system, programming model, and runtime environment.
Patent Information:
Title App Type Country Serial No. Patent No. File Date Issued Date Expire Date Patent Status
System and Method for Sparse Matrix Vector Multiplication Processing Utility United States 13/456,657 8,862,653 4/26/2012 10/14/2014 4/24/2033  
For Information, Contact:
Technology Commercialization
University of South Carolina
Jason Bakos
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