A Dynamic Load-Balanced Hashing Scheme for Networking Applications
| Autor: | Haowei Yuan, Hung-Hsiang Jonathan Chao, N.S. Artan |
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| Rok vydání: | 2008 |
| Předmět: |
Primary clustering
business.industry Computer science Dynamic perfect hashing Hash function Hash buster Parallel computing Linear hashing 2-choice hashing Rolling hash Merkle tree Hash table Secure Hash Standard Hash tree SHA-2 Hash list Data_FILES Cryptographic hash function Hash chain Hash filter business Consistent hashing Perfect hash function Double hashing Computer network |
| Zdroj: | GLOBECOM |
| DOI: | 10.1109/glocom.2008.ecp.395 |
| Popis: | 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. In the worst case, the query, delete, and insert operations take one, two, and three burst accesses, respectively. The proposed architecture reduces hash overflows by 35% compared to a naive hash table and for each key uses 6.42 bits of on-chip memory. |
| Databáze: | OpenAIRE |
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