Paper Info
Title
Buddy-RAM: Improving the Performance and Efficiency of Bulk Bitwise Operations Using DRAM.
Abstract
Bitwise operations are an important component of modern day programming. Many widely-used data structures (e.g., bitmap indices in databases) rely on fast bitwise operations on large bit vectors to achieve high performance. Unfortunately, in existing systems, regardless of the underlying architecture (e.g., CPU, GPU, FPGA), the throughput of such bulk bitwise operations is limited by the available memory bandwidth. propose Buddy, a new mechanism that exploits the analog operation of DRAM to perform bulk bitwise operations completely inside the DRAM chip. Buddy consists of two components. First, simultaneous activation of three DRAM rows that are connected to the same set of sense amplifiers enables us to perform bitwise AND and OR operations. Second, the inverters present in each sense amplifier enables us to perform bitwise NOT operations, with modest changes to the DRAM array. These two components make Buddy functionally complete. implementation of Buddy largely exploits the existing DRAM structure and interface, and incurs low overhead (1% of DRAM chip area). Our evaluations based on SPICE simulations show that, across seven commonly-used bitwise operations, Buddy provides between 10.9X---25.6X improvement in raw throughput and 25.1X---59.5X reduction in energy consumption. We evaluate three real-world data-intensive applications that exploit bitwise operations: 1) bitmap indices, 2) BitWeaving, and 3) bitvector-based implementation of sets. evaluations show that Buddy significantly outperforms the state-of-the-art.
Year
Venue
Field
2016
arXiv: Hardware Architecture
Dram,Sense amplifier,Data structure,Memory bandwidth,Bitwise operation,Computer science,Parallel computing,Real-time computing,Mask,Bitwise operations in C,Bitmap,Computer hardware
DocType
Volume
Citations 
Journal
abs/1611.09988
0
PageRank 
References 
Authors
0.34
0
10
Name
Order
Citations
PageRank
Vivek Seshadri199232.76
Dong-Hyuk Lee2125448.26
Thomas Mullins300.34
Hasan Hassan435217.76
Amirali Boroumand5922.69
Jeremie Kim626313.68
Michael A. Kozuch7178282.65
Onur Mutlu89446357.40
Phillip B. Gibbons96863624.14
Todd C. Mowry103021253.75