A Dynamic Load-Balanced Hashing Scheme for Networking Applications

Abstract—Network applications often require large data storage resources, fast queries, and frequent updates. Hash tables support these operations with low costs, yet they cannot provide worst-case guarantees because of hash collisions. Also, the widely used, low-cost Dynamic Random Access Memory (DRAM) cannot suitably accommodate hash tables because DRAMs provide full bandwidth only if accessed in bursts, whereas hash tables require random access. In this paper, we propose a hash co-processor to support hash tables on DRAMs. The co-processor provides a load-balancing method to reduce the impact of hash collisions on the worst-case behavior by moving multiple keys within the hash table in constant time. This leads to a balanced distribution of keys in the hash table despite the collisions. Furthermore, the coprocessor guarantees the full DRAM bandwidth is always utilized by defining all fundamental hash table operations, namely insert, query, and delete, in terms of burst accesses. ...

• Type: Conference
• Year: 2008
• Where: GLOBECOM
• Authors: N. Sertac Artan, Haowei Yuan, H. Jonathan Chao
• Keywords: Accommodate Hash Tables, GLOBECOM 2008, Hash Collisions, Hash Table, Telecommunications