Abslrucf-Thispaper presents a workload characterization study for Internet Web servers. Six diRerent data sets are used in the study: three From academic environments, two from scientific research organizations, and one from a commercial Internet provider. These data sets represent three different orders of magnitude in server activity, and two different orders of magnitude in time duration, ranging from one week of activity to one year.The workload characterization focuses on the document type distribution, the document size distribution, the document referencing behavior, and the geographic distribution of server requests. Throughout the study, emphasis is placed on tinding workload characteristics that are common to all the data sets studied. Ten such characteristics are identifted. The paper concludes with a discussion of caching and performance issues, using the observed workload characteristics to suggest performance enhancements that seem promising for Internet Web servers.

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