lmbench: portable tools for performance analysis
ATEC '96 Proceedings of the 1996 annual conference on USENIX Annual Technical Conference
Fair and timely scheduling via cooperative polling
Proceedings of the 4th ACM European conference on Computer systems
RSIO: automatic user interaction detection and scheduling
Proceedings of the ACM SIGMETRICS international conference on Measurement and modeling of computer systems
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The X server is charged with providing window system services to many applications simultaneously, and needs a scheduling mechanism to distribute it's limited resources among these applications. The original scheduling mechanism was simplistic and caused graphics-intensive applications to starve interactive applications. A new scheduling mechanism has been designed which fairly distributes time among the requesting applications while at the same time increasing performance by a small amount. Descriptions of the original and new scheduling mechanism and empirical measurements demonstrating the effects of scheduling within the X server are included along with a discussion on how the design was arrived at.