title: Scaling in the structure of directory trees in a computer cluster.
abstract: We describe the topological structure and the underlying organization principles of the directories created by users of a computer cluster. Users create trees with a scale-free degree distribution whose properties are reproduced by a growth and preferential attachment mechanism with a single parameter. The degree distribution has a nonuniversal exponent associated with different values of the parameter. However, the distribution of branch sizes has a universal exponent analytically obtained from the model.
authors.affiliation: Department of Bioinformatics, University Leipzig, Härtelstrasse 16-18, 04103 Leipzig, Germany.
authors.forename: Konstantin
authors.initials: K
authors.lastname: Klemm
authors.forename: Víctor M
authors.initials: VM
authors.lastname: Eguíluz
authors.forename: Maxi
authors.initials: M
authors.lastname: San Miguel