Paper Info
Title
Performance scalability of a multi-core web server
Abstract
Today's large multi-core Internet servers support thousands of concurrent connections or ows. The computation ability of future server platforms will depend on increasing numbers of cores. The key to ensure that performance scales with cores is to ensure that systems software and hardware are designed to fully exploit the parallelism that is inherent in independent network ows. This paper identifies the major bottlenecks to scalability for a reference server workload on a commercial server platform. However, performance scaling on commercial web servers has proven elusive. We determined that on web server running a modified SPEC-web2005 Support workload, throughput scales only 4.8 x on eight cores. Our results show that the operating system, TCP/IP stack, and application exploited ow-level parallelism well with few exceptions, and that load imbalance and shared cache affected performance little. Having eliminated these potential bottlenecks, we determined that performance scaling was limited by the capacity of the address bus, which became saturated on all eight cores. If this key obstacle is addressed, commercial web server and systems software are well-positioned to scale to a large number of cores.
Year
DOI
Venue
2007
10.1145/1323548.1323562
ANCS
Keywords
Field
DocType
multi-core web server,systems software,commercial web server,future server platform,performance scale,cache affected performance,web server,commercial server platform,performance scalability,large multi-core internet server,performance scaling,reference server workload,load balancing,web servers,load balance,scalability,network protocol,operating system,networks
Server farm,Computer science,Load balancing (computing),Server,Round-robin DNS,Computer network,Real-time computing,Multi-core processor,Web server,Client–server model,Scalability,Distributed computing
Conference
Citations 
PageRank 
References 
44
3.66
11
Authors
2
Name
Order
Citations
PageRank
Bryan Veal11269.37
Foong, A.P.218514.14