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자료유형
학술저널
저자정보
저널정보
SK텔레콤 Telecommunications Review Telecommunications Review 제19권 제3호
발행연도
2009.1
수록면
490 - 509 (20page)

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High performance Web servers have become a mandate for an increasing number of network-based applications and services. To meet this need, System Area Networks (SANs) have been designed to free up valuable server resources such as CPU cycles, to improve performance of applications running on the server. In this paper, we examine the architecture of Web Server Clusters based on SANs and exploit the abundant local memory available in programmable Network Interface Cards (NICs) for SANs. We explore two NIC caching schemes, namely, exclusive caching and inclusive caching, to reduce disk accesses and communication cost (in terms of data transfer latency), respectively. In addition, we explore impact of an I/O interconnection architecture, cache replacement policy and scalability on performance with the NIC caching schemes in Web Server Clusters. To maximize performance benefit from those caching schemes, we analyze performance implication of NIC caching on the Web server under several Web workloads of different characteristics. Moreover, we developed a simulator which is validated with an 8-node prototype implementation for performance evaluation. We conduct extensive experiments to compare the performance of Web servers with or without using NIC caching. Our results show that the proposed NIC caching schemes significantly increase throughput over the original system which does not use the NIC caching. The exclusive caching scheme becomes beneficial when a workload shows a low popularity skewness, while the inclusive caching scheme is particularly effective with workloads with the large file sizes and high popularity skewness. The results provide important guidance for tuning NIC caching schemes in Web Server Clusters.

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