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BSDCon '03 — Abstract
Pp. 17-28 of the Proceedings
ULE: A Modern Scheduler for FreeBSD
Jeff Roberson, The FreeBSD Project
Abstract
The existing thread scheduler in FreeBSD was well suited towards the computing environment that it was
developed in. As the priorities and hardware targets of the project have changed, new features and scheduling
properties were required. This paper presents ULE, a scheduler that is designed with modern hardware and
requirements in mind. Prior to discussing ULE, the designs of several other schedulers are presented to provide
some context for comparison. A simple scheduler profiling tool is also discussed, the results of which provide a
basis for making simple comparisons between important aspects of several schedulers.
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